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Signal WiFi faible

J'ai un Fujitsu Lifebook AH531 (je pense que le sans fil est Intel® Centrino® Wireless-N 1030, 802.11 b/g/n)

J'ai récemment installé Ubuntu 14.04 LTS Auparavant, j'utilisais Ubuntu 12.04 LTS et Windows 7 sur le même ordinateur et le signal WiFi était normal.

Après l’installation de 14.04 LTS, le signal WiFi est très faible. Par comparaison, mon téléphone et mon MacBook affichent un signal complet.

Voici ce que montre iwconfig ("x" ajouté par moi):

vmnet8    no wireless extensions.

eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"xxxxxxx"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: xx:xx:xx:xx:xx:xx   
          Bit Rate=65 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=38/70  Signal level=-72 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:2  Invalid misc:33   Missed beacon:0

vmnet1    no wireless extensions.

Des idées sur ce qui cause ceci et comment le résoudre?

UPDATE1: Voici les résultats de dmesg | grep iwl:

[   12.981861] iwlwifi 0000:01:00.0: can't disable ASPM; OS doesn't have ASPM control
[   12.982170] iwlwifi 0000:01:00.0: irq 43 for MSI/MSI-X
[   13.395624] iwlwifi 0000:01:00.0: loaded firmware version 18.168.6.1 op_mode iwldvm
[   13.414785] iwlwifi 0000:01:00.0: CONFIG_IWLWIFI_DEBUG disabled
[   13.414787] iwlwifi 0000:01:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
[   13.414788] iwlwifi 0000:01:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[   13.414790] iwlwifi 0000:01:00.0: Detected Intel(R) Centrino(R) Wireless-N 1030 BGN, REV=0xB0
[   13.414893] iwlwifi 0000:01:00.0: L1 Enabled; Disabling L0S
[   13.435161] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
[   16.755014] iwlwifi 0000:01:00.0: L1 Enabled; Disabling L0S
[   16.761688] iwlwifi 0000:01:00.0: Radio type=0x2-0x2-0x1
[   16.829339] iwlwifi 0000:01:00.0: L1 Enabled; Disabling L0S
[   16.836056] iwlwifi 0000:01:00.0: Radio type=0x2-0x2-0x1
[ 1795.831710] iwlwifi 0000:01:00.0: no hotplug settings from platform
[ 1797.361326] iwlwifi 0000:01:00.0: L1 Enabled; Disabling L0S
[ 1797.368062] iwlwifi 0000:01:00.0: Radio type=0x2-0x2-0x1
[ 2408.998423] iwlwifi 0000:01:00.0: fail to flush all tx fifo queues Q 2
[ 2408.998438] iwlwifi 0000:01:00.0: Current SW read_ptr 227 write_ptr 101
[ 2408.998496] iwl data: 00000000: 00 00 00 00 00 00 00 00 f8 ff 07 00 00 00 00 00  ................
[ 2408.998540] iwlwifi 0000:01:00.0: FH TRBs(0) = 0x80003019
[ 2408.998584] iwlwifi 0000:01:00.0: FH TRBs(1) = 0x801020f2
[ 2408.998627] iwlwifi 0000:01:00.0: FH TRBs(2) = 0x00000000
[ 2408.998668] iwlwifi 0000:01:00.0: FH TRBs(3) = 0x80300027
[ 2408.998711] iwlwifi 0000:01:00.0: FH TRBs(4) = 0x00000000
[ 2408.998751] iwlwifi 0000:01:00.0: FH TRBs(5) = 0x00000000
[ 2408.998789] iwlwifi 0000:01:00.0: FH TRBs(6) = 0x00000000
[ 2408.998836] iwlwifi 0000:01:00.0: FH TRBs(7) = 0x0070903b
[ 2408.998926] iwlwifi 0000:01:00.0: Q 0 is active and mapped to fifo 3 ra_tid 0x0000 [40,40]
[ 2408.999016] iwlwifi 0000:01:00.0: Q 1 is active and mapped to fifo 2 ra_tid 0x0000 [0,0]
[ 2408.999116] iwlwifi 0000:01:00.0: Q 2 is active and mapped to fifo 1 ra_tid 0x0000 [227,101]
[ 2408.999205] iwlwifi 0000:01:00.0: Q 3 is active and mapped to fifo 0 ra_tid 0x0000 [26,26]
[ 2408.999293] iwlwifi 0000:01:00.0: Q 4 is active and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2408.999417] iwlwifi 0000:01:00.0: Q 5 is active and mapped to fifo 4 ra_tid 0x0000 [0,0]
[ 2408.999505] iwlwifi 0000:01:00.0: Q 6 is active and mapped to fifo 2 ra_tid 0x0000 [0,0]
[ 2408.999635] iwlwifi 0000:01:00.0: Q 7 is active and mapped to fifo 5 ra_tid 0x0000 [0,0]
[ 2408.999732] iwlwifi 0000:01:00.0: Q 8 is active and mapped to fifo 4 ra_tid 0x0000 [0,0]
[ 2408.999822] iwlwifi 0000:01:00.0: Q 9 is active and mapped to fifo 7 ra_tid 0x0000 [60,60]
[ 2408.999920] iwlwifi 0000:01:00.0: Q 10 is active and mapped to fifo 5 ra_tid 0x0000 [0,0]
[ 2409.000007] iwlwifi 0000:01:00.0: Q 11 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2409.000092] iwlwifi 0000:01:00.0: Q 12 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2409.000177] iwlwifi 0000:01:00.0: Q 13 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2409.000269] iwlwifi 0000:01:00.0: Q 14 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2409.000358] iwlwifi 0000:01:00.0: Q 15 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2409.000442] iwlwifi 0000:01:00.0: Q 16 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2409.000521] iwlwifi 0000:01:00.0: Q 17 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2409.000607] iwlwifi 0000:01:00.0: Q 18 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2409.000686] iwlwifi 0000:01:00.0: Q 19 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.855478] iwlwifi 0000:01:00.0: fail to flush all tx fifo queues Q 2
[ 2477.855490] iwlwifi 0000:01:00.0: Current SW read_ptr 70 write_ptr 194
[ 2477.855544] iwl data: 00000000: c0 ff 3f 00 00 00 00 00 00 00 00 00 00 00 00 00  ..?.............
[ 2477.855586] iwlwifi 0000:01:00.0: FH TRBs(0) = 0x8000301b
[ 2477.855624] iwlwifi 0000:01:00.0: FH TRBs(1) = 0x80102055
[ 2477.855661] iwlwifi 0000:01:00.0: FH TRBs(2) = 0x00000000
[ 2477.855697] iwlwifi 0000:01:00.0: FH TRBs(3) = 0x8030002e
[ 2477.855734] iwlwifi 0000:01:00.0: FH TRBs(4) = 0x00000000
[ 2477.855770] iwlwifi 0000:01:00.0: FH TRBs(5) = 0x00000000
[ 2477.855807] iwlwifi 0000:01:00.0: FH TRBs(6) = 0x00000000
[ 2477.855844] iwlwifi 0000:01:00.0: FH TRBs(7) = 0x007090c7
[ 2477.855924] iwlwifi 0000:01:00.0: Q 0 is active and mapped to fifo 3 ra_tid 0x0000 [47,47]
[ 2477.856075] iwlwifi 0000:01:00.0: Q 1 is active and mapped to fifo 2 ra_tid 0x0000 [0,0]
[ 2477.856159] iwlwifi 0000:01:00.0: Q 2 is active and mapped to fifo 1 ra_tid 0x0000 [70,194]
[ 2477.856237] iwlwifi 0000:01:00.0: Q 3 is active and mapped to fifo 0 ra_tid 0x0000 [28,28]
[ 2477.856324] iwlwifi 0000:01:00.0: Q 4 is active and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.856403] iwlwifi 0000:01:00.0: Q 5 is active and mapped to fifo 4 ra_tid 0x0000 [0,0]
[ 2477.856488] iwlwifi 0000:01:00.0: Q 6 is active and mapped to fifo 2 ra_tid 0x0000 [0,0]
[ 2477.856567] iwlwifi 0000:01:00.0: Q 7 is active and mapped to fifo 5 ra_tid 0x0000 [0,0]
[ 2477.856645] iwlwifi 0000:01:00.0: Q 8 is active and mapped to fifo 4 ra_tid 0x0000 [0,0]
[ 2477.856725] iwlwifi 0000:01:00.0: Q 9 is active and mapped to fifo 7 ra_tid 0x0000 [200,200]
[ 2477.856805] iwlwifi 0000:01:00.0: Q 10 is active and mapped to fifo 5 ra_tid 0x0000 [0,0]
[ 2477.856885] iwlwifi 0000:01:00.0: Q 11 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.856965] iwlwifi 0000:01:00.0: Q 12 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.857044] iwlwifi 0000:01:00.0: Q 13 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.857122] iwlwifi 0000:01:00.0: Q 14 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.857202] iwlwifi 0000:01:00.0: Q 15 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.857282] iwlwifi 0000:01:00.0: Q 16 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.857363] iwlwifi 0000:01:00.0: Q 17 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.857443] iwlwifi 0000:01:00.0: Q 18 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[ 2477.857521] iwlwifi 0000:01:00.0: Q 19 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.427882] iwlwifi 0000:01:00.0: fail to flush all tx fifo queues Q 2
[38618.427898] iwlwifi 0000:01:00.0: Current SW read_ptr 20 write_ptr 43
[38618.427952] iwl data: 00000000: 00 00 f0 ff 00 00 00 00 0f 00 00 00 00 00 00 00  ................
[38618.428008] iwlwifi 0000:01:00.0: FH TRBs(0) = 0x80003090
[38618.428064] iwlwifi 0000:01:00.0: FH TRBs(1) = 0x80102023
[38618.428120] iwlwifi 0000:01:00.0: FH TRBs(2) = 0x00000000
[38618.428171] iwlwifi 0000:01:00.0: FH TRBs(3) = 0x8030004c
[38618.428210] iwlwifi 0000:01:00.0: FH TRBs(4) = 0x00000000
[38618.428257] iwlwifi 0000:01:00.0: FH TRBs(5) = 0x00000000
[38618.428322] iwlwifi 0000:01:00.0: FH TRBs(6) = 0x00000000
[38618.428385] iwlwifi 0000:01:00.0: FH TRBs(7) = 0x00709010
[38618.428530] iwlwifi 0000:01:00.0: Q 0 is active and mapped to fifo 3 ra_tid 0x0000 [77,77]
[38618.428677] iwlwifi 0000:01:00.0: Q 1 is active and mapped to fifo 2 ra_tid 0x0000 [0,0]
[38618.428801] iwlwifi 0000:01:00.0: Q 2 is active and mapped to fifo 1 ra_tid 0x0000 [20,43]
[38618.428929] iwlwifi 0000:01:00.0: Q 3 is active and mapped to fifo 0 ra_tid 0x0000 [145,145]
[38618.429071] iwlwifi 0000:01:00.0: Q 4 is active and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.429173] iwlwifi 0000:01:00.0: Q 5 is active and mapped to fifo 4 ra_tid 0x0000 [0,0]
[38618.429275] iwlwifi 0000:01:00.0: Q 6 is active and mapped to fifo 2 ra_tid 0x0000 [0,0]
[38618.429378] iwlwifi 0000:01:00.0: Q 7 is active and mapped to fifo 5 ra_tid 0x0000 [0,0]
[38618.429463] iwlwifi 0000:01:00.0: Q 8 is active and mapped to fifo 4 ra_tid 0x0000 [0,0]
[38618.429553] iwlwifi 0000:01:00.0: Q 9 is active and mapped to fifo 7 ra_tid 0x0000 [17,17]
[38618.429655] iwlwifi 0000:01:00.0: Q 10 is active and mapped to fifo 5 ra_tid 0x0000 [0,0]
[38618.429741] iwlwifi 0000:01:00.0: Q 11 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.429843] iwlwifi 0000:01:00.0: Q 12 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.429939] iwlwifi 0000:01:00.0: Q 13 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.430110] iwlwifi 0000:01:00.0: Q 14 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.430315] iwlwifi 0000:01:00.0: Q 15 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.430448] iwlwifi 0000:01:00.0: Q 16 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.430544] iwlwifi 0000:01:00.0: Q 17 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.430649] iwlwifi 0000:01:00.0: Q 18 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[38618.430762] iwlwifi 0000:01:00.0: Q 19 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]

UPDATE2: J'ai essayé le correctif suggéré par @ chili555 et voici les résultats.

dmesg | grep iwl
[   12.554087] iwlwifi 0000:01:00.0: can't disable ASPM; OS doesn't have ASPM control
[   12.554303] iwlwifi 0000:01:00.0: irq 42 for MSI/MSI-X
[   12.928234] iwlwifi 0000:01:00.0: loaded firmware version 18.168.6.1 op_mode iwldvm
[   12.947135] iwlwifi 0000:01:00.0: CONFIG_IWLWIFI_DEBUG disabled
[   12.947136] iwlwifi 0000:01:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
[   12.947137] iwlwifi 0000:01:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[   12.947138] iwlwifi 0000:01:00.0: Detected Intel(R) Centrino(R) Wireless-N 1030 BGN, REV=0xB0
[   12.947242] iwlwifi 0000:01:00.0: L1 Enabled; Disabling L0S
[   12.967026] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
[   16.787447] iwlwifi 0000:01:00.0: L1 Enabled; Disabling L0S
[   16.794188] iwlwifi 0000:01:00.0: Radio type=0x2-0x2-0x1
[   16.862264] iwlwifi 0000:01:00.0: L1 Enabled; Disabling L0S
[   16.868991] iwlwifi 0000:01:00.0: Radio type=0x2-0x2-0x1

Toutes les erreurs de fifio n'apparaissent plus

iwconfig 
vmnet8    no wireless extensions.

eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"xxxxx"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: xxxxxxxxxx   
          Bit Rate=65 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=43/70  Signal level=-67 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:4   Missed beacon:0

vmnet1    no wireless extensions.

Il y a une légère amélioration à la fois de la qualité de la liaison et du niveau du signal.

Néanmoins, la qualité du signal est inférieure à celle d’autres appareils que je possède.

14.04wirelessnetworkingintel-wireless
1
AugustinJ

Je remarque qu'une partie de votre dmesg est:

ne pas vider toutes les files d'attente tx fifo

C’est le sujet d’un rapport de bogue: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1361809 Comme vous pouvez le voir au commentaire n ° 6, il y a un correctif noyau disponible et un suivi indiquant qu'il a été corrigé. Je connais un autre cas similaire sur ubuntuforums.org qui a également résolu le problème.

Je vous suggère d'aller ici: http://people.canonical.com/~sforshee/lp1361809/linux-3.13.0-37.64+lp1361809v201410060628/ Téléchargez les fichiers .deb pour linux-image et linux -image-extra approprié à votre architecture; 32 ou 64 bits. Découvrez à partir du terminal:

Arch

i686 est renvoyé pour les systèmes 32 bits et x86_64 pour les systèmes 64 bits. Ainsi, par exemple, si votre système est un système 64 bits, téléchargez le fichier AMD64.deb de linux-image et le fichier AMD64.deb de linux-image-extras. Installer avec:

cd ~/Downloads  <--or wherever you downloaded the files
Sudo dpkg -i linux*.deb

Redémarrez et laissez-nous entendre votre résultat.

Si les performances ne sont pas améliorées, essayons un paramètre de pilote:

Sudo -i
echo "options iwlwifi 11n_disable=8"  >>  /etc/modprobe.d/iwlwifi.conf
exit

Et puis redémarrez et testez.

Si cela est inefficace, veuillez:

gksudo gedit /etc/modprobe.d/iwlwifi.conf

Utilisez nano ou kate ou leafpad si vous n'avez pas l'éditeur de texte gedit. Changer la dernière ligne pour lire:

options iwlwifi 11n_disable=1

Relisez attentivement, enregistrez et fermez l'éditeur de texte. Redémarrez et testez.

2
chili555