voilà :
<pre>ppn@ppnultra:~$ lsusb -t
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/9p, 480M
|__ Port 6: Dev 2, If 0, Class=Wireless, Driver=btusb, 12M
|__ Port 6: Dev 2, If 1, Class=Wireless, Driver=btusb, 12M
|__ Port 7: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 8: Dev 4, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 5, If 0, Class=Vendor Specific Class, Driver=r8152, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
</pre>
<pre>ppn@ppnultra:~$ sblsmod | sort
sblsmod : commande introuvable
ppn@ppnultra:~$ lsmod | sort
acer_wmi 24576 0
acpi_als 20480 0
aesni_intel 372736 48
af_alg 24576 62 algif_hash,algif_skcipher
ahci 40960 4
algif_hash 16384 15
algif_skcipher 16384 15
ashmem_linux 20480 0
autofs4 45056 2
binder_linux 180224 0
binfmt_misc 24576 1
bluetooth 581632 40 btrtl,hidp,btqca,btintel,hci_uart,btbcm,bnep,btusb,rfcomm
bnep 24576 2
btbcm 16384 2 hci_uart,btusb
btintel 24576 2 hci_uart,btusb
btqca 20480 1 hci_uart
btrtl 24576 2 hci_uart,btusb
btusb 57344 0
ccm 20480 3
cdc_ether 20480 0
cfg80211 704512 3 iwlmvm,iwlwifi,mac80211
cmac 16384 31
coretemp 20480 0
crc32_pclmul 16384 0
crct10dif_pclmul 16384 1
cryptd 24576 17 crypto_simd,ghash_clmulni_intel
crypto_simd 16384 1 aesni_intel
drm 491520 6 drm_kms_helper,i915
drm_kms_helper 184320 1 i915
ecc 28672 1 ecdh_generic
ecdh_generic 16384 2 bluetooth
fb_sys_fops 16384 1 drm_kms_helper
ghash_clmulni_intel 16384 0
glue_helper 16384 1 aesni_intel
hci_uart 126976 0
hid 131072 4 hidp,usbhid,hid_multitouch,hid_generic
hid_generic 16384 0
hid_multitouch 28672 0
hidp 28672 1
i2c_algo_bit 16384 1 i915
i2c_i801 32768 0
i915 1986560 24
industrialio 73728 2 acpi_als,kfifo_buf
input_leds 16384 0
intel_cstate 20480 0
intel_powerclamp 20480 0
intel_rapl_common 24576 1 intel_rapl_msr
intel_rapl_msr 20480 0
intel_smartconnect 16384 0
ip_tables 32768 0
iwlmvm 380928 0
iwlwifi 331776 1 iwlmvm
joydev 24576 0
kfifo_buf 16384 1 acpi_als
kvm 663552 1 kvm_intel
kvm_intel 282624 0
ledtrig_audio 16384 2 snd_hda_codec_generic,snd_hda_codec_realtek
libahci 32768 1 ahci
libarc4 16384 1 mac80211
lp 20480 0
lpc_ich 24576 0
mac80211 843776 1 iwlmvm
mac_hid 16384 0
mei 106496 3 mei_hdcp,mei_me
mei_hdcp 24576 0
mei_me 40960 1
mii 20480 2 usbnet,r8152
Module Size Used by
nls_iso8859_1 16384 1
parport 53248 3 parport_pc,lp,ppdev
parport_pc 40960 0
ppdev 24576 0
psmouse 155648 0
r8152 69632 0
rapl 20480 0
rfcomm 81920 4
sch_fq_codel 20480 2
serio_raw 20480 0
snd 90112 19 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm,snd_rawmidi
snd_hda_codec 131072 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
snd_hda_codec_generic 81920 1 snd_hda_codec_realtek
snd_hda_codec_hdmi 61440 1
snd_hda_codec_realtek 126976 1
snd_hda_core 90112 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
snd_hda_intel 53248 4
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
soundcore 16384 1 snd
sparse_keymap 16384 1 acer_wmi
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
usbhid 57344 0
usbnet 45056 1 cdc_ether
video 49152 2 acer_wmi,i915
wmi 32768 2 acer_wmi,wmi_bmof
wmi_bmof 16384 0
x86_pkg_temp_thermal 20480 0
x_tables 40960 1 ip_tables
</pre>
<pre>ppn@ppnultra:~$ webcam
reading config file: /home/ppn/.webcamrc
v4l2: open /dev/video0: No such file or directory
vid-open: failed: libv4l
no grabber device available
</pre>
