Bonjour,
l'essentiel est dans le titre :
sur le portable de ma fille fraîchement installé en Voyager (Xubuntu) 16.04.1 (out of the box) effectivement quasiment tout marche, sauf le wi-fi, qui ne parvient pas à garder la connexion au-delà de 2 ou 3 m ; pas plus!
Mon portable perso quant à lui capte très bien la même connexion (Livebox) et bien au-delà ; d'ailleurs nos invités n'ont jamais eu aucun problème pour se connecter en wi-fi.
Cela fait une semaine que je tente de comprendre en épluchant les forums... mais j'avoue sécher complètement!
Si les réponses du terminal aux questions posées par l'excellent script de "cracolinux" (je suis encore sidéré, bluffé par ce qu'il est possible de faire avec un terminal) éveillent des idées...
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>> cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.1 LTS"
>> lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 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 006 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 005 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 003 Device 004: ID 03f0:171d Hewlett-Packard Bluetooth 2.0 Interface [Broadcom BCM2045]
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
>> lspci -k -nn | grep -A 3 -i net
00:19.0 Ethernet controller [0200]: Intel Corporation 82567LM Gigabit Network Connection [8086:10f5] (rev 03)
Subsystem: Hewlett-Packard Company 82567LM Gigabit Network Connection [103c:30e1]
Kernel driver in use: e1000e
Kernel modules: e1000e
00:1a.0 USB controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 [8086:2937] (rev 03)
--
02:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection [8086:4237]
Subsystem: Intel Corporation WiFi Link 5100 AGN [8086:1211]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
>> sudo lshw -C network
*-network
description: Ethernet interface
produit: 82567LM Gigabit Network Connection
fabriquant: Intel Corporation
identifiant matériel: 19
information bus: pci@0000:00:19.0
nom logique: enp0s25
version: 03
numéro de série: 00:23:5a:ab:92:5a
capacité: 1Gbit/s
bits: 32 bits
horloge: 33MHz
fonctionnalités: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=1.8-3 latency=0 link=no multicast=yes port=twisted pair
ressources: irq:27 mémoire:d4800000-d481ffff mémoire:d4824000-d4824fff portE/S:40e0(taille=32)
*-network
description: Interface réseau sans fil
produit: PRO/Wireless 5100 AGN [Shiloh] Network Connection
fabriquant: Intel Corporation
identifiant matériel: 0
information bus: pci@0000:02:00.0
nom logique: wls1
version: 00
numéro de série: 00:21:6b:b2:1a:a8
bits: 64 bits
horloge: 33MHz
fonctionnalités: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=4.4.0-57-generic firmware=8.83.5.1 build 33692 ip=192.168.1.11 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
ressources: irq:31 mémoire:d4600000-d4601fff
>> lsmod
Module Size Used by
drbg 32768 1
ansi_cprng 16384 0
ctr 16384 1
ccm 20480 1
rfcomm 69632 12
bnep 20480 2
hp_wmi 16384 0
sparse_keymap 16384 1 hp_wmi
coretemp 16384 0
snd_hda_codec_hdmi 53248 1
snd_hda_codec_analog 16384 1
snd_hda_codec_generic 77824 1 snd_hda_codec_analog
kvm 540672 0
irqbypass 16384 1 kvm
arc4 16384 2
iwldvm 233472 0
joydev 20480 0
mac80211 737280 1 iwldvm
input_leds 16384 0
serio_raw 16384 0
iwlwifi 200704 1 iwldvm
lpc_ich 24576 0
cfg80211 565248 3 iwlwifi,mac80211,iwldvm
snd_hda_intel 40960 3
snd_hda_codec 135168 4 snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_codec_analog
btusb 45056 0
snd_hda_core 73728 5 snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_hda_codec_analog
btrtl 16384 1 btusb
snd_hwdep 16384 1 snd_hda_codec
btbcm 16384 1 btusb
btintel 16384 1 btusb
bluetooth 520192 37 bnep,btbcm,btrtl,btusb,rfcomm,btintel
snd_pcm 106496 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_core
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_rawmidi 32768 1 snd_seq_midi
snd_seq 69632 2 snd_seq_midi_event,snd_seq_midi
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer 32768 2 snd_pcm,snd_seq
snd 81920 17 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_hda_codec_analog
soundcore 16384 1 snd
eeprom 16384 0
shpchp 36864 0
8250_fintek 16384 0
tpm_infineon 20480 0
ip6t_REJECT 16384 1
nf_reject_ipv6 16384 1 ip6t_REJECT
nf_log_ipv6 16384 5
hp_accel 28672 0
lis3lv02d 20480 1 hp_accel
mac_hid 16384 0
input_polldev 16384 1 lis3lv02d
xt_hl 16384 22
ip6t_rt 16384 3
nf_conntrack_ipv6 20480 8
nf_defrag_ipv6 36864 1 nf_conntrack_ipv6
ipt_REJECT 16384 1
nf_reject_ipv4 16384 1 ipt_REJECT
nf_log_ipv4 16384 5
nf_log_common 16384 2 nf_log_ipv4,nf_log_ipv6
xt_LOG 16384 10
xt_limit 16384 13
xt_tcpudp 16384 18
xt_addrtype 16384 4
nf_conntrack_ipv4 16384 8
nf_defrag_ipv4 16384 1 nf_conntrack_ipv4
xt_conntrack 16384 16
ip6table_filter 16384 1
ip6_tables 28672 1 ip6table_filter
nf_conntrack_netbios_ns 16384 0
nf_conntrack_broadcast 16384 1 nf_conntrack_netbios_ns
nf_nat_ftp 16384 0
nf_nat 24576 1 nf_nat_ftp
nf_conntrack_ftp 20480 1 nf_nat_ftp
nf_conntrack 106496 8 nf_nat_ftp,nf_conntrack_netbios_ns,nf_nat,xt_conntrack,nf_conntrack_broadcast,nf_conntrack_ftp,nf_conntrack_ipv4,nf_conntrack_ipv6
iptable_filter 16384 1
ip_tables 24576 1 iptable_filter
x_tables 36864 13 ip6table_filter,xt_hl,ip_tables,xt_tcpudp,xt_limit,xt_conntrack,xt_LOG,iptable_filter,ip6t_rt,ipt_REJECT,ip6_tables,xt_addrtype,ip6t_REJECT
parport_pc 32768 0
ppdev 20480 0
lp 20480 0
parport 49152 3 lp,ppdev,parport_pc
autofs4 40960 2
psmouse 131072 0
firewire_ohci 40960 0
ahci 36864 2
i915 1208320 5
libahci 32768 1 ahci
sdhci_pci 28672 0
sdhci 45056 1 sdhci_pci
firewire_core 65536 1 firewire_ohci
crc_itu_t 16384 1 firewire_core
i2c_algo_bit 16384 1 i915
drm_kms_helper 155648 1 i915
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
fb_sys_fops 16384 1 drm_kms_helper
e1000e 237568 0
drm 364544 7 i915,drm_kms_helper
ptp 20480 1 e1000e
pps_core 20480 1 ptp
wmi 20480 1 hp_wmi
video 40960 1 i915
fjes 28672 0
>> iwconfig
wls1 IEEE 802.11abgn ESSID:"Livebox-27f8"
Mode:Managed Frequency:2.437 GHz Access Point: D0:AE:EC:46:4A:10
Bit Rate=1 Mb/s Tx-Power=15 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=33/70 Signal level=-77 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:17 Invalid misc:88 Missed beacon:0
>> ifconfig -a
enp0s25 Link encap:Ethernet HWaddr 00:23:5a:ab:92:5a
UP BROADCAST MULTICAST MTU:1500 Metric:1
Packets reçus:235 erreurs:0 :0 overruns:0 frame:0
TX packets:214 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:94220 (94.2 KB) Octets transmis:19929 (19.9 KB)
Interruption:22 Mémoire:d4800000-d4820000
lo Link encap:Boucle locale
inet adr:127.0.0.1 Masque:255.0.0.0
adr inet6: ::1/128 Scope:Hôte
UP LOOPBACK RUNNING MTU:65536 Metric:1
Packets reçus:486 erreurs:0 :0 overruns:0 frame:0
TX packets:486 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1
Octets reçus:33937 (33.9 KB) Octets transmis:33937 (33.9 KB)
wls1 Link encap:Ethernet HWaddr 00:21:6b:b2:1a:a8
inet adr:192.168.1.11 Bcast:192.168.1.255 Masque:255.255.255.0
adr inet6: fe80::5881:da7d:ba4:ac7a/64 Scope:Lien
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:39 erreurs:0 :0 overruns:0 frame:0
TX packets:73 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:12964 (12.9 KB) Octets transmis:13043 (13.0 KB)
>> sudo iwlist scan
wls1 Scan completed :
Cell 01 - Address: D0:AE:EC:46:4A:10
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=37/70 Signal level=-73 dBm
Encryption key:on
ESSID:"Livebox-27f8"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=0000000009185e9b
Extra: Last beacon: 2288ms ago
IE: Unknown: 000C4C697665626F782D32376638
IE: Unknown: 010882848B960C121824
IE: Unknown: 030106
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: 2D1A0C101BFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D1606001B00000000000000000000000000000000000000
IE: Unknown: DD0900037F01010000FF7F
IE: Unknown: DD0A00037F04010000000000
IE: Unknown: 0706465220010D14
IE: Unknown: DD850050F204104A0001101044000102103B0001031047001000000000000010000000D0AEEC464A1010210005536167656D1023000F4C697665626F78204654544820763210240007422E312E312E3110420009414E313532343346461054000800060050F20400011011000F4C697665626F782046545448207632100800020086103C000101
Cell 02 - Address: DA:AE:EC:46:4A:10
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=37/70 Signal level=-73 dBm
Encryption key:off
ESSID:""
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=0000000008b101bb
Extra: Last beacon: 10040ms ago
IE: Unknown: 0000
IE: Unknown: 010882848B960C121824
IE: Unknown: 030106
IE: Unknown: 050402030000
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: 2D1A0C101BFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D1606001B00000000000000000000000000000000000000
IE: Unknown: DD0900037F01010000FF7F
IE: Unknown: DD0A00037F04010000000000
IE: Unknown: 0706465220010D14
>> uname -r -m
4.4.0-57-generic x86_64
>> cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
>> nm-tool
>> nmcli dev wifi
* SSID MODE CHAN DÉBIT SIGNAL BARS SÉCURITÉ
-- Infra 6 54 Mo/s 45 ▂▄__ --
* Livebox-27f8 Infra 6 54 Mo/s 45 ▂▄__ WPA1 WPA2
>> nmcli connection show
NOM UUID TYPE PÉRIPHÉRIQUE
Livebox-27f8 99c59c0b-6efc-47dd-86e5-ed79c4c4218b 802-11-wireless wls1
Connexion filaire 1 69afee4b-8eaa-3616-975e-d2b1a4b24180 802-3-ethernet --
>> sudo rfkill list
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hp-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
3: hp-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
4: hp-gps: GPS
Soft blocked: yes
Hard blocked: yes
6: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
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Merci d'avance et bon "bout d'an" à chacun