Ce site est optimisé pour être consulté depuis un navigateur moderne dans lequel JavaScript est activé.

webcam plus détectée

Nico89

Bonsoir,
Je viens à vous car ma webcam n'est plus détecté par l'OS.
Voici quelques commandes lancées :

nico@vaio:~$ lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 005: ID 044e:3012 Alps Electric Co., Ltd 
Bus 007 Device 004: ID 044e:3013 Alps Electric Co., Ltd 
Bus 007 Device 003: ID 044e:3010 Alps Electric Co., Ltd Bluetooth Adapter
Bus 007 Device 002: ID 044e:3011 Alps Electric Co., Ltd BCM2045B2
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
nico@vaio:~$ v4l2-ctl --list-devices
Cannot open device /dev/video0, exiting.
nico@vaio:~$ lsmod | grep uvcvideo
nico@vaio:~$

Ma webcam est une ricoh avec les pilotes r5u87x.

Pouvez-vous m'aider ?
En vous remerciant

xubu1957

Bonjour,

En lançant en commande :

webcam

ressort-il un message d'erreur ?

Tu avais vu ce fil > Plus de webcam [RESOLU] ?

Nico89

Bonsoir,
Oui j'avais vu ce fil, à la différence près c'est que ma webcam n'était pas listée dans lsusb

toto@titi:~$ webcam
bash: webcam : commande introuvable
toto@titi:~$

Toutefois, je clôturer le sujet car hier, dans la soirée, alors que je n'avais même pas redémarré le PC, la webcam est revenu et listée dans lsusb.
Il y a vraiment des comportements bizarres!

Nico89

Bonjour,
Je me permets de relancer le sujet, ma caméra est de nouveau non détectée, même après redémarrage du PC.

xubu1957

Bonjour,

Montre, en te servant du Retour utilisable de commande :

lsusb | sort; echo; lsusb -t

lsmod | sort

dmesg | grep -i usb

Nico89

Re-
alors voici les retours de commandes :

xxx@xxx:~$ lsusb | sort; echo; lsusb -t
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 002: ID 044e:3011 Alps Electric Co., Ltd BCM2045B2
Bus 007 Device 003: ID 044e:3010 Alps Electric Co., Ltd Bluetooth Adapter
Bus 007 Device 004: ID 044e:3013 Alps Electric Co., Ltd 
Bus 007 Device 005: ID 044e:3012 Alps Electric Co., Ltd 

/:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/3p, 12M
        |__ Port 1: Dev 3, If 3, Class=Application Specific Interface, Driver=, 12M
        |__ Port 1: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M
        |__ Port 1: Dev 3, If 2, Class=Vendor Specific Class, Driver=, 12M
        |__ Port 1: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M
        |__ Port 2: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M
        |__ Port 3: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/4p, 480M
xxx@xxx:~$

xxx@xxx:~$ lsmod | sort
ahci                   40960  3
autofs4                45056  2
binfmt_misc            24576  1
bluetooth             548864  37 btrtl,btintel,btbcm,bnep,btusb,rfcomm
bnep                   24576  2
bpfilter               32768  0
btbcm                  16384  1 btusb
btintel                24576  1 btusb
btrfs                1253376  0
btrtl                  24576  1 btusb
btusb                  57344  0
ccm                    20480  3
cfg80211              704512  3 iwl4965,iwlegacy,mac80211
cifs                 1024000  10
coretemp               20480  0
crc_itu_t              16384  1 firewire_core
cryptd                 24576  1 crypto_simd
crypto_simd            16384  0
dm_crypt               40960  1
dm_log                 20480  2 dm_region_hash,dm_mirror
dm_mirror              24576  0
dm_region_hash         20480  1 dm_mirror
drm                   491520  3 nvidia
ecc                    28672  1 ecdh_generic
ecdh_generic           16384  1 bluetooth
firewire_core          65536  1 firewire_ohci
firewire_ohci          40960  0
fscache               372736  1 cifs
glue_helper            16384  0
hid                   131072  2 usbhid,hid_generic
hid_generic            16384  0
i2c_i801               32768  0
input_leds             16384  0
ip6table_filter        16384  1
ip6_tables             32768  1 ip6table_filter
ip6t_REJECT            16384  0
ip6t_rt                20480  0
iptable_filter         16384  1
ip_tables              32768  1 iptable_filter
ipt_REJECT             16384  0
iwl4965               118784  0
iwlegacy               98304  1 iwl4965
joydev                 24576  0
kvm                   663552  1 kvm_intel
kvm_intel             282624  0
ledtrig_audio          16384  1 snd_hda_codec_generic
libahci                32768  1 ahci
libarc4                16384  2 cifs,mac80211
libcrc32c              16384  2 nf_conntrack,btrfs
libdes                 24576  1 cifs
lp                     20480  0
lpc_ich                24576  0
mac80211              843776  2 iwl4965,iwlegacy
mac_hid                16384  0
mc                     53248  4 videodev,videobuf2_v4l2,uvcvideo,videobuf2_common
md4                    16384  0
Module                  Size  Used by
nf_conntrack          139264  1 xt_conntrack
nf_defrag_ipv4         16384  1 nf_conntrack
nf_defrag_ipv6         24576  1 nf_conntrack
nf_reject_ipv4         16384  1 ipt_REJECT
nf_reject_ipv6         20480  1 ip6t_REJECT
nls_iso8859_1          16384  1
nls_utf8               16384  6
nvidia              10584064  43 nvidia_uvm
nvidia_uvm             36864  0
parport                53248  3 parport_pc,lp,ppdev
parport_pc             40960  0
pata_acpi              16384  0
pcmcia                 65536  0
pcmcia_core            28672  3 pcmcia,pcmcia_rsrc,yenta_socket
pcmcia_rsrc            24576  1 yenta_socket
ppdev                  24576  0
psmouse               155648  0
raid6_pq              114688  1 btrfs
rfcomm                 81920  16
sch_fq_codel           20480  5
serio_raw              20480  0
sky2                   65536  0
snd                    90112  17 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_timer,snd_pcm,snd_hda_codec_idt,snd_rawmidi
snd_hda_codec         135168  4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_idt
snd_hda_codec_generic    81920  1 snd_hda_codec_idt
snd_hda_codec_hdmi     61440  1
snd_hda_codec_idt      61440  1
snd_hda_core           90112  5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_idt
snd_hda_intel          53248  3
snd_hwdep              20480  1 snd_hda_codec
snd_intel_dspcfg       24576  1 snd_hda_intel
snd_pcm               106496  4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core
snd_rawmidi            36864  1 snd_seq_midi
snd_seq                69632  2 snd_seq_midi,snd_seq_midi_event
snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi
snd_seq_midi           20480  0
snd_seq_midi_event     16384  1 snd_seq_midi
snd_timer              36864  2 snd_seq,snd_pcm
sony_laptop            61440  0
soundcore              16384  1 snd
tifm_7xx1              20480  0
tifm_core              16384  1 tifm_7xx1
usbhid                 57344  0
uvcvideo               98304  0
vboxdrv               487424  2 vboxnetadp,vboxnetflt
vboxnetadp             28672  0
vboxnetflt             28672  0
video                  49152  1 sony_laptop
videobuf2_common       49152  2 videobuf2_v4l2,uvcvideo
videobuf2_memops       20480  1 videobuf2_vmalloc
videobuf2_v4l2         24576  1 uvcvideo
videobuf2_vmalloc      20480  1 uvcvideo
videodev              225280  3 videobuf2_v4l2,uvcvideo,videobuf2_common
xor                    24576  1 btrfs
x_tables               40960  14 ip6table_filter,xt_conntrack,iptable_filter,xt_LOG,xt_tcpudp,xt_addrtype,xt_recent,ip6t_rt,ip6_tables,ipt_REJECT,ip_tables,xt_limit,xt_hl,ip6t_REJECT
xt_addrtype            16384  0
xt_conntrack           16384  0
xt_hl                  16384  0
xt_limit               16384  0
xt_LOG                 20480  0
xt_recent              24576  0
xt_tcpudp              20480  0
yenta_socket           49152  0
zram                   32768  2
zstd_compress         167936  1 btrfs
xxx@xxx:~$

xxx@xxx:~$ dmesg | grep -i usb
[    0.580619] ACPI: bus type USB registered
[    0.580619] usbcore: registered new interface driver usbfs
[    0.580619] usbcore: registered new interface driver hub
[    0.580619] usbcore: registered new device driver usb
[    1.158878] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    1.159078] ehci-pci 0000:00:1a.7: new USB bus registered, assigned bus number 1
[    1.175537] ehci-pci 0000:00:1a.7: USB 2.0 started, EHCI 1.00
[    1.175587] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[    1.175589] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.175590] usb usb1: Product: EHCI Host Controller
[    1.175592] usb usb1: Manufacturer: Linux 5.4.0-52-generic ehci_hcd
[    1.175593] usb usb1: SerialNumber: 0000:00:1a.7
[    1.175747] hub 1-0:1.0: USB hub found
[    1.176120] ehci-pci 0000:00:1d.7: new USB bus registered, assigned bus number 2
[    1.195535] ehci-pci 0000:00:1d.7: USB 2.0 started, EHCI 1.00
[    1.195599] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[    1.195601] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.195603] usb usb2: Product: EHCI Host Controller
[    1.195604] usb usb2: Manufacturer: Linux 5.4.0-52-generic ehci_hcd
[    1.195605] usb usb2: SerialNumber: 0000:00:1d.7
[    1.195751] hub 2-0:1.0: USB hub found
[    1.195985] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    1.196007] uhci_hcd: USB Universal Host Controller Interface driver
[    1.196190] uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 3
[    1.196290] usb usb3: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.196291] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.196293] usb usb3: Product: UHCI Host Controller
[    1.196294] usb usb3: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.196295] usb usb3: SerialNumber: 0000:00:1a.0
[    1.196432] hub 3-0:1.0: USB hub found
[    1.196736] uhci_hcd 0000:00:1a.1: new USB bus registered, assigned bus number 4
[    1.196825] usb usb4: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.196827] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.196828] usb usb4: Product: UHCI Host Controller
[    1.196829] usb usb4: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.196830] usb usb4: SerialNumber: 0000:00:1a.1
[    1.196965] hub 4-0:1.0: USB hub found
[    1.197256] uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 5
[    1.197330] usb usb5: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.197332] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.197333] usb usb5: Product: UHCI Host Controller
[    1.197334] usb usb5: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.197335] usb usb5: SerialNumber: 0000:00:1d.0
[    1.197480] hub 5-0:1.0: USB hub found
[    1.197772] uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 6
[    1.197857] usb usb6: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.197859] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.197860] usb usb6: Product: UHCI Host Controller
[    1.197862] usb usb6: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.197863] usb usb6: SerialNumber: 0000:00:1d.1
[    1.197984] hub 6-0:1.0: USB hub found
[    1.198272] uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 7
[    1.198361] usb usb7: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.198363] usb usb7: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.198364] usb usb7: Product: UHCI Host Controller
[    1.198366] usb usb7: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.198367] usb usb7: SerialNumber: 0000:00:1d.2
[    1.198488] hub 7-0:1.0: USB hub found
[    1.735525] usb 7-1: new full-speed USB device number 2 using uhci_hcd
[    1.933534] usb 7-1: New USB device found, idVendor=044e, idProduct=3011, bcdDevice= 1.00
[    1.933536] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    1.933537] usb 7-1: Product: BCM2045B2
[    1.933539] usb 7-1: Manufacturer: Broadcom
[    1.935576] hub 7-1:1.0: USB hub found
[    2.231531] usb 7-1.1: new full-speed USB device number 3 using uhci_hcd
[    2.379537] usb 7-1.1: New USB device found, idVendor=044e, idProduct=3010, bcdDevice= 0.56
[    2.379539] usb 7-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    2.379541] usb 7-1.1: Product: BCM2046 Bluetooth Device
[    2.379543] usb 7-1.1: Manufacturer: Broadcom Corp
[    2.379544] usb 7-1.1: SerialNumber: 001E3D897E4C
[    2.467506] usb 7-1.2: new full-speed USB device number 4 using uhci_hcd
[    2.601562] usb 7-1.2: New USB device found, idVendor=044e, idProduct=3013, bcdDevice= 1.00
[    2.601564] usb 7-1.2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    2.611744] usbcore: registered new interface driver usbhid
[    2.611745] usbhid: USB HID core driver
[    2.614725] input: HID 044e:3013 as /devices/pci0000:00/0000:00:1d.2/usb7/7-1/7-1.2/7-1.2:1.0/0003:044E:3013.0001/input/input5
[    2.671690] hid-generic 0003:044E:3013.0001: input,hidraw0: USB HID v1.11 Keyboard [HID 044e:3013] on usb-0000:00:1d.2-1.2/input0
[    2.687538] usb 7-1.3: new full-speed USB device number 5 using uhci_hcd
[    2.820550] usb 7-1.3: New USB device found, idVendor=044e, idProduct=3012, bcdDevice= 1.00
[    2.820552] usb 7-1.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    2.827164] input: HID 044e:3012 Mouse as /devices/pci0000:00/0000:00:1d.2/usb7/7-1/7-1.3/7-1.3:1.0/0003:044E:3012.0002/input/input6
[    2.827291] hid-generic 0003:044E:3012.0002: input,hidraw1: USB HID v1.11 Mouse [HID 044e:3012] on usb-0000:00:1d.2-1.3/input0
[   35.524581] usbcore: registered new interface driver btusb
[   35.539515] usb 7-1.2: input irq status -75 received
[   35.555515] usb 7-1.2: input irq status -75 received
[   35.571514] usb 7-1.2: input irq status -75 received
[   35.587514] usb 7-1.2: input irq status -75 received
[   35.603514] usb 7-1.2: input irq status -75 received
[   35.618535] usb 7-1.2: input irq status -75 received
[   35.635537] usb 7-1.2: input irq status -75 received
[   35.651513] usb 7-1.2: input irq status -75 received
[   35.667518] usb 7-1.2: input irq status -75 received
[   35.683525] usb 7-1.2: input irq status -75 received
[   35.699521] usb 7-1.2: input irq status -75 received
[   35.715520] usb 7-1.2: input irq status -75 received
[   35.731521] usb 7-1.2: input irq status -75 received
[   35.747520] usb 7-1.2: input irq status -75 received
[ 9848.926108] usb usb3: root hub lost power or was reset
[ 9848.926143] usb usb4: root hub lost power or was reset
[ 9848.926262] usb usb5: root hub lost power or was reset
[ 9848.926366] usb usb6: root hub lost power or was reset
[ 9848.926400] usb usb7: root hub lost power or was reset
[ 9849.283578] usb 7-1: reset full-speed USB device number 2 using uhci_hcd
[ 9849.751563] usb 7-1.1: reset full-speed USB device number 3 using uhci_hcd
[ 9849.947552] usb 7-1.2: reset full-speed USB device number 4 using uhci_hcd
[ 9850.143547] usb 7-1.3: reset full-speed USB device number 5 using uhci_hcd
[ 9850.458925] usb 7-1.2: input irq status -75 received
[ 9850.474925] usb 7-1.2: input irq status -75 received
[ 9850.490925] usb 7-1.2: input irq status -75 received
[ 9850.506928] usb 7-1.2: input irq status -75 received
[ 9850.522929] usb 7-1.2: input irq status -75 received
[ 9850.539053] usb 7-1.2: input irq status -75 received
[ 9850.554926] usb 7-1.2: input irq status -75 received
[ 9850.570938] usb 7-1.2: input irq status -75 received
[ 9850.586933] usb 7-1.2: input irq status -75 received
[ 9850.602932] usb 7-1.2: input irq status -75 received
[ 9850.618938] usb 7-1.2: input irq status -75 received
[ 9850.634941] usb 7-1.2: input irq status -75 received
[ 9850.650946] usb 7-1.2: input irq status -75 received
[ 9850.666946] usb 7-1.2: input irq status -75 received
[15529.611579] usb 1-2: new high-speed USB device number 2 using ehci-pci
[15741.747586] usb 1-2: new high-speed USB device number 3 using ehci-pci
[15741.907457] usb 1-2: New USB device found, idVendor=05ca, idProduct=183b, bcdDevice= 1.00
[15741.907465] usb 1-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[15743.302281] input: UVC Camera (05ca:183b) as /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/input/input12
[15743.302648] usbcore: registered new interface driver uvcvideo
[15743.302651] USB Video Class driver (1.1.1)
[15743.622091] usbcore: deregistering interface driver uvcvideo
[15743.920450] input: UVC Camera (05ca:183b) as /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/input/input13
[15743.921133] usbcore: registered new interface driver uvcvideo
[15743.921135] USB Video Class driver (1.1.1)
[15857.927667] usb 1-2: USB disconnect, device number 3
xxx@xxx:~$

Je pense avoir tout mis

xubu1957

Tente :

sudo modprobe -r uvcvideo && sudo modprobe uvcvideo

Nico89

re-
ça ne donne rien

xubu1957

deregistering interface driver uvcvideo

dés-enregistrement du pilote d'interface uvcvideo

Je ne sais pas répondre pour cela.

Nico89

Je ne comprends pas, qu'est-ce que cela veut dire ?

xubu1957

Je ne sais pas. ¯_(ツ)_/¯

_ _ _

Je n'avais pas trouvé pour > [Résolu] webcam logitech ultravision non accessible sous Ubuntu 18.04

ylag

Bonsoir,

Au risque de dire un grosse bêtise, le retour de la commande dmesg -l err dans la discussion citée par @xubu1957 au #11 contient beaucoup de lignes du genre de:

uvcvideo: Failed to set UVC probe control : -110 (exp. 26)

Sans en être certain, ça pourrait se rapporter à un souci d'alimentation électrique du périphérique en question?

Vérifier s'il y a ce genre de retour lorsque la caméra n'est plus détectée avec la commande:

dmesg -l err

...si oui, regarder au niveau de la connectique de la caméra?

A+

xubu1957

@ylag

Bonsoir.

Comme dans > [Solved] The uvcvideo module is being deregistered

ylag

@xubu1957:

Bonsoir!

Sûrement possible, mais je ne connais pas powerdown-git.

Est-il question de quelque chose de semblable à ce script: https://github.com/jharshman/powerdown-git ?

A+

xubu1957

Je sais qu'il ne faut pas brancher trop de périphériques sur les ordis.

Nico89

Re-
Du coup, il faudrait que j'ouvre le PC portable pour vérifier si la caméra est bien alimentée ?

xubu1957

Bonjour,

Il y avait eu > [Résolu]Webcam non reconnue sur HP Envy

_ _ _

Le 09/05/2020, Andrey Kashirin a écritOn dirait que c'est un problème Hardware. Probablement en raison de l'angle assez limité (tel que prévu) d'ouverture du couvercle du moniteur, certains câbles usb sont endommagés.

> askubuntu.com/questions/1228264/asus-laption-integrated-camera-not-detected

_ _ _

Nico89 a écritMa webcam est une ricoh avec les pilotes r5u87x.

> [SOLVED] Vaio webcam Ricoh - r5u87x for ubuntu 20.04?

Le pilote r5u87x ne semble plus être disponible.

Nico89

Bonsoir,
De coup j'ai ouvert mon PC aujourd'hui, j'ai testé au multimètre chaque pin de la nappe de la webcam. Tout est ok.
En remontant le PC, j'ai retrouvé la webcam.
Voici quelques retours de commande :

xxx@xxx:~$ lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 005: ID 044e:3012 Alps Electric Co., Ltd 
Bus 007 Device 004: ID 044e:3013 Alps Electric Co., Ltd 
Bus 007 Device 003: ID 044e:3010 Alps Electric Co., Ltd Bluetooth Adapter
Bus 007 Device 002: ID 044e:3011 Alps Electric Co., Ltd BCM2045B2
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 05ca:183b Ricoh Co., Ltd Visual Communication Camera VGP-VCC8 [R5U870]
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
xxx@xxx:~$

On voit bien la caméra.

xxx@xxx:~$ lsmod | sort
ahci                   40960  3
autofs4                45056  2
binfmt_misc            24576  1
bluetooth             548864  37 btrtl,btintel,btbcm,bnep,btusb,rfcomm
bnep                   24576  2
bpfilter               32768  0
btbcm                  16384  1 btusb
btintel                24576  1 btusb
btrfs                1253376  0
btrtl                  24576  1 btusb
btusb                  57344  0
ccm                    20480  3
cfg80211              704512  3 iwl4965,iwlegacy,mac80211
cifs                 1024000  10
coretemp               20480  0
crc_itu_t              16384  1 firewire_core
cryptd                 24576  1 crypto_simd
crypto_simd            16384  0
dm_crypt               40960  1
dm_log                 20480  2 dm_region_hash,dm_mirror
dm_mirror              24576  0
dm_region_hash         20480  1 dm_mirror
drm                   491520  3 nvidia
ecc                    28672  1 ecdh_generic
ecdh_generic           16384  1 bluetooth
firewire_core          65536  1 firewire_ohci
firewire_ohci          40960  0
fscache               372736  1 cifs
glue_helper            16384  0
hid                   131072  4 usbhid,hid_generic,hid_logitech_dj,hid_logitech_hidpp
hid_generic            16384  0
hid_logitech_dj        24576  0
hid_logitech_hidpp     45056  0
i2c_i801               32768  0
input_leds             16384  0
ip6table_filter        16384  1
ip6_tables             32768  53 ip6table_filter
ip6t_REJECT            16384  1
ip6t_rt                20480  3
iptable_filter         16384  1
ip_tables              32768  9 iptable_filter
ipt_REJECT             16384  1
iwl4965               118784  0
iwlegacy               98304  1 iwl4965
joydev                 24576  0
kvm                   663552  1 kvm_intel
kvm_intel             282624  0
ledtrig_audio          16384  1 snd_hda_codec_generic
libahci                32768  1 ahci
libarc4                16384  2 cifs,mac80211
libcrc32c              16384  2 nf_conntrack,btrfs
libdes                 24576  1 cifs
lp                     20480  0
lpc_ich                24576  0
mac80211              843776  2 iwl4965,iwlegacy
mac_hid                16384  0
mc                     53248  4 videodev,videobuf2_v4l2,uvcvideo,videobuf2_common
md4                    16384  0
Module                  Size  Used by
nf_conntrack          139264  1 xt_conntrack
nf_defrag_ipv4         16384  1 nf_conntrack
nf_defrag_ipv6         24576  1 nf_conntrack
nf_reject_ipv4         16384  1 ipt_REJECT
nf_reject_ipv6         20480  1 ip6t_REJECT
nls_iso8859_1          16384  1
nls_utf8               16384  6
nvidia              10584064  43 nvidia_uvm
nvidia_uvm             36864  0
parport                53248  3 parport_pc,lp,ppdev
parport_pc             40960  0
pata_acpi              16384  0
pcmcia                 65536  0
pcmcia_core            28672  3 pcmcia,pcmcia_rsrc,yenta_socket
pcmcia_rsrc            24576  1 yenta_socket
ppdev                  24576  0
psmouse               155648  0
raid6_pq              114688  1 btrfs
rfcomm                 81920  16
sch_fq_codel           20480  5
serio_raw              20480  0
sky2                   65536  0
snd                    90112  17 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_timer,snd_pcm,snd_hda_codec_idt,snd_rawmidi
snd_hda_codec         135168  4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_idt
snd_hda_codec_generic    81920  1 snd_hda_codec_idt
snd_hda_codec_hdmi     61440  1
snd_hda_codec_idt      61440  1
snd_hda_core           90112  5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_idt
snd_hda_intel          53248  3
snd_hwdep              20480  1 snd_hda_codec
snd_intel_dspcfg       24576  1 snd_hda_intel
snd_pcm               106496  4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core
snd_rawmidi            36864  1 snd_seq_midi
snd_seq                69632  2 snd_seq_midi,snd_seq_midi_event
snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi
snd_seq_midi           20480  0
snd_seq_midi_event     16384  1 snd_seq_midi
snd_timer              36864  2 snd_seq,snd_pcm
sony_laptop            61440  0
soundcore              16384  1 snd
tifm_7xx1              20480  0
tifm_core              16384  1 tifm_7xx1
usbhid                 57344  1 hid_logitech_dj
uvcvideo               98304  4
vboxdrv               487424  2 vboxnetadp,vboxnetflt
vboxnetadp             28672  0
vboxnetflt             28672  0
video                  49152  1 sony_laptop
videobuf2_common       49152  2 videobuf2_v4l2,uvcvideo
videobuf2_memops       20480  1 videobuf2_vmalloc
videobuf2_v4l2         24576  1 uvcvideo
videobuf2_vmalloc      20480  1 uvcvideo
videodev              225280  7 videobuf2_v4l2,uvcvideo,videobuf2_common
xor                    24576  1 btrfs
x_tables               40960  12 ip6table_filter,xt_conntrack,iptable_filter,xt_tcpudp,xt_addrtype,ip6t_rt,ip6_tables,ipt_REJECT,ip_tables,xt_limit,xt_hl,ip6t_REJECT
xt_addrtype            16384  4
xt_conntrack           16384  14
xt_hl                  16384  22
xt_limit               16384  1
xt_tcpudp              20480  22
yenta_socket           49152  0
zram                   32768  2
zstd_compress         167936  1 btrfs
xxx@xxx:~$

xxx@xxx:~$ lsusb | sort; echo; lsusb -t
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 05ca:183b Ricoh Co., Ltd Visual Communication Camera VGP-VCC8 [R5U870]
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 002: ID 044e:3011 Alps Electric Co., Ltd BCM2045B2
Bus 007 Device 003: ID 044e:3010 Alps Electric Co., Ltd Bluetooth Adapter
Bus 007 Device 004: ID 044e:3013 Alps Electric Co., Ltd 
Bus 007 Device 005: ID 044e:3012 Alps Electric Co., Ltd 

/:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/3p, 12M
        |__ Port 1: Dev 3, If 3, Class=Application Specific Interface, Driver=, 12M
        |__ Port 1: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M
        |__ Port 1: Dev 3, If 2, Class=Vendor Specific Class, Driver=, 12M
        |__ Port 1: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M
        |__ Port 2: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M
        |__ Port 3: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 1: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 1: Dev 2, If 2, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/4p, 480M
    |__ Port 2: Dev 2, If 0, Class=Video, Driver=uvcvideo, 480M
    |__ Port 2: Dev 2, If 1, Class=Video, Driver=uvcvideo, 480M
xxx@xxx:~$

Là aussi

xxx@xxx:~$ dmesg | grep -i usb
[    0.581095] ACPI: bus type USB registered
[    0.581095] usbcore: registered new interface driver usbfs
[    0.581095] usbcore: registered new interface driver hub
[    0.581095] usbcore: registered new device driver usb
[    1.159094] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    1.159309] ehci-pci 0000:00:1a.7: new USB bus registered, assigned bus number 1
[    1.175770] ehci-pci 0000:00:1a.7: USB 2.0 started, EHCI 1.00
[    1.175839] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[    1.175841] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.175843] usb usb1: Product: EHCI Host Controller
[    1.175844] usb usb1: Manufacturer: Linux 5.4.0-52-generic ehci_hcd
[    1.175845] usb usb1: SerialNumber: 0000:00:1a.7
[    1.176012] hub 1-0:1.0: USB hub found
[    1.176389] ehci-pci 0000:00:1d.7: new USB bus registered, assigned bus number 2
[    1.199779] ehci-pci 0000:00:1d.7: USB 2.0 started, EHCI 1.00
[    1.199820] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[    1.199822] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.199823] usb usb2: Product: EHCI Host Controller
[    1.199825] usb usb2: Manufacturer: Linux 5.4.0-52-generic ehci_hcd
[    1.199826] usb usb2: SerialNumber: 0000:00:1d.7
[    1.199975] hub 2-0:1.0: USB hub found
[    1.200943] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    1.200971] uhci_hcd: USB Universal Host Controller Interface driver
[    1.201161] uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 3
[    1.201247] usb usb3: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.201249] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.201250] usb usb3: Product: UHCI Host Controller
[    1.201251] usb usb3: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.201252] usb usb3: SerialNumber: 0000:00:1a.0
[    1.201387] hub 3-0:1.0: USB hub found
[    1.201698] uhci_hcd 0000:00:1a.1: new USB bus registered, assigned bus number 4
[    1.201781] usb usb4: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.201783] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.201784] usb usb4: Product: UHCI Host Controller
[    1.201786] usb usb4: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.201787] usb usb4: SerialNumber: 0000:00:1a.1
[    1.201922] hub 4-0:1.0: USB hub found
[    1.202436] uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 5
[    1.202511] usb usb5: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.202513] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.202514] usb usb5: Product: UHCI Host Controller
[    1.202515] usb usb5: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.202517] usb usb5: SerialNumber: 0000:00:1d.0
[    1.202889] hub 5-0:1.0: USB hub found
[    1.203493] uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 6
[    1.203599] usb usb6: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.203601] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.203602] usb usb6: Product: UHCI Host Controller
[    1.203603] usb usb6: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.203604] usb usb6: SerialNumber: 0000:00:1d.1
[    1.203851] hub 6-0:1.0: USB hub found
[    1.204312] uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 7
[    1.204394] usb usb7: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[    1.204396] usb usb7: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.204397] usb usb7: Product: UHCI Host Controller
[    1.204399] usb usb7: Manufacturer: Linux 5.4.0-52-generic uhci_hcd
[    1.204400] usb usb7: SerialNumber: 0000:00:1d.2
[    1.204878] hub 7-0:1.0: USB hub found
[    1.511727] usb 1-2: new high-speed USB device number 2 using ehci-pci
[    1.671596] usb 1-2: New USB device found, idVendor=05ca, idProduct=183b, bcdDevice= 1.00
[    1.671598] usb 1-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.739722] usb 5-1: new full-speed USB device number 2 using uhci_hcd
[    1.932748] usb 5-1: New USB device found, idVendor=046d, idProduct=c52b, bcdDevice=24.07
[    1.932753] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    1.932756] usb 5-1: Product: USB Receiver
[    1.932759] usb 5-1: Manufacturer: Logitech
[    1.966133] usbcore: registered new interface driver usbhid
[    1.966135] usbhid: USB HID core driver
[    1.970118] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.0/0003:046D:C52B.0001/input/input5
[    2.027892] hid-generic 0003:046D:C52B.0001: input,hidraw0: USB HID v1.11 Keyboard [Logitech USB Receiver] on usb-0000:00:1d.0-1/input0
[    2.028404] input: Logitech USB Receiver Mouse as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.1/0003:046D:C52B.0002/input/input6
[    2.028539] input: Logitech USB Receiver Consumer Control as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.1/0003:046D:C52B.0002/input/input7
[    2.091852] input: Logitech USB Receiver System Control as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.1/0003:046D:C52B.0002/input/input8
[    2.092000] hid-generic 0003:046D:C52B.0002: input,hiddev0,hidraw1: USB HID v1.11 Mouse [Logitech USB Receiver] on usb-0000:00:1d.0-1/input1
[    2.092430] hid-generic 0003:046D:C52B.0003: hiddev1,hidraw2: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:1d.0-1/input2
[    2.236878] logitech-djreceiver 0003:046D:C52B.0003: hiddev0,hidraw0: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:1d.0-1/input2
[    2.359296] input: Logitech Unifying Device. Wireless PID:4057 Mouse as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.2/0003:046D:C52B.0003/0003:046D:4057.0004/input/input10
[    2.359396] hid-generic 0003:046D:4057.0004: input,hidraw1: USB HID v1.11 Mouse [Logitech Unifying Device. Wireless PID:4057] on usb-0000:00:1d.0-1/input2:1
[    2.361408] input: Logitech Unifying Device. Wireless PID:400d Keyboard as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.2/0003:046D:C52B.0003/0003:046D:400D.0005/input/input14
[    2.361500] input: Logitech Unifying Device. Wireless PID:400d Consumer Control as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.2/0003:046D:C52B.0003/0003:046D:400D.0005/input/input15
[    2.361565] hid-generic 0003:046D:400D.0005: input,hidraw2: USB HID v1.11 Keyboard [Logitech Unifying Device. Wireless PID:400d] on usb-0000:00:1d.0-1/input2:2
[    2.397821] input: Logitech M275/M280 as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.2/0003:046D:C52B.0003/0003:046D:4057.0004/input/input19
[    2.397959] logitech-hidpp-device 0003:046D:4057.0004: input,hidraw1: USB HID v1.11 Mouse [Logitech M275/M280] on usb-0000:00:1d.0-1/input2:1
[    2.439751] usb 2-2: new high-speed USB device number 3 using ehci-pci
[    2.489956] input: Logitech K230 as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/5-1:1.2/0003:046D:C52B.0003/0003:046D:400D.0005/input/input20
[    2.490050] logitech-hidpp-device 0003:046D:400D.0005: input,hidraw2: USB HID v1.11 Keyboard [Logitech K230] on usb-0000:00:1d.0-1/input2:2
[    2.596907] usb 2-2: New USB device found, idVendor=04b0, idProduct=0224, bcdDevice= 1.00
[    2.596909] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    2.596910] usb 2-2: Product: NIKON DSC COOLPIX P310-PTP
[    2.596912] usb 2-2: Manufacturer: NIKON
[    2.596913] usb 2-2: SerialNumber: 30022609
[    2.943741] usb 7-1: new full-speed USB device number 2 using uhci_hcd
[    3.147787] usb 7-1: New USB device found, idVendor=044e, idProduct=3011, bcdDevice= 1.00
[    3.147789] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    3.147790] usb 7-1: Product: BCM2045B2
[    3.147791] usb 7-1: Manufacturer: Broadcom
[    3.149818] hub 7-1:1.0: USB hub found
[    3.459740] usb 7-1.1: new full-speed USB device number 3 using uhci_hcd
[    3.610787] usb 7-1.1: New USB device found, idVendor=044e, idProduct=3010, bcdDevice= 0.56
[    3.610789] usb 7-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    3.610791] usb 7-1.1: Product: BCM2046 Bluetooth Device
[    3.610792] usb 7-1.1: Manufacturer: Broadcom Corp
[    3.610793] usb 7-1.1: SerialNumber: 001E3D897E4C
[    3.695741] usb 7-1.2: new full-speed USB device number 4 using uhci_hcd
[    3.831774] usb 7-1.2: New USB device found, idVendor=044e, idProduct=3013, bcdDevice= 1.00
[    3.831776] usb 7-1.2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    3.837252] input: HID 044e:3013 as /devices/pci0000:00/0000:00:1d.2/usb7/7-1/7-1.2/7-1.2:1.0/0003:044E:3013.0006/input/input21
[    3.896208] hid-generic 0003:044E:3013.0006: input,hidraw3: USB HID v1.11 Keyboard [HID 044e:3013] on usb-0000:00:1d.2-1.2/input0
[    3.979742] usb 7-1.3: new full-speed USB device number 5 using uhci_hcd
[    4.119788] usb 7-1.3: New USB device found, idVendor=044e, idProduct=3012, bcdDevice= 1.00
[    4.119790] usb 7-1.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    4.126427] input: HID 044e:3012 Mouse as /devices/pci0000:00/0000:00:1d.2/usb7/7-1/7-1.3/7-1.3:1.0/0003:044E:3012.0007/input/input22
[    4.126556] hid-generic 0003:044E:3012.0007: input,hidraw4: USB HID v1.11 Mouse [HID 044e:3012] on usb-0000:00:1d.2-1.3/input0
[   37.792763] input: UVC Camera (05ca:183b) as /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/input/input28
[   37.792924] usbcore: registered new interface driver uvcvideo
[   37.792925] USB Video Class driver (1.1.1)
[   38.025800] usbcore: deregistering interface driver uvcvideo
[   38.497356] input: UVC Camera (05ca:183b) as /devices/pci0000:00/0000:00:1a.7/usb1/1-2/1-2:1.0/input/input29
[   38.497471] usbcore: registered new interface driver uvcvideo
[   38.497472] USB Video Class driver (1.1.1)
[   38.681205] usbcore: registered new interface driver btusb
[   38.697770] usb 7-1.2: input irq status -75 received
[   38.713768] usb 7-1.2: input irq status -75 received
[   38.729770] usb 7-1.2: input irq status -75 received
[   38.744792] usb 7-1.2: input irq status -75 received
[   38.761792] usb 7-1.2: input irq status -75 received
[   38.776794] usb 7-1.2: input irq status -75 received
[11338.590332] usb usb3: root hub lost power or was reset
[11338.590357] usb usb4: root hub lost power or was reset
[11338.590493] usb usb5: root hub lost power or was reset
[11338.592531] usb usb6: root hub lost power or was reset
[11338.594435] usb usb7: root hub lost power or was reset
[11338.939812] usb 5-1: reset full-speed USB device number 2 using uhci_hcd
[11338.947782] usb 7-1: reset full-speed USB device number 2 using uhci_hcd
[11339.427764] usb 7-1.1: reset full-speed USB device number 3 using uhci_hcd
[11339.619794] usb 7-1.2: reset full-speed USB device number 4 using uhci_hcd
[11339.819763] usb 7-1.3: reset full-speed USB device number 5 using uhci_hcd
[11341.660751] usb 2-2: USB disconnect, device number 3
[11341.677788] usb 7-1.2: input irq status -75 received
[11341.693788] usb 7-1.2: input irq status -75 received
[11341.709784] usb 7-1.2: input irq status -75 received
[11341.725789] usb 7-1.2: input irq status -75 received
[11341.741789] usb 7-1.2: input irq status -75 received
[11341.757786] usb 7-1.2: input irq status -75 received
xxx@xxx:~$

Soit j'ai bougé quelquechose, soit ça va me refaire la même chose dans quelques temps.
C'est pas la première fois que je perds la caméra comme ça. D'ailleurs c'était la raison pour laquelle j'avais posté il y a un mois, et la caméra était revenu sans que je fasse quoique ce soit.