description: Wireless interface
                product: PRO/Wireless 4965 AG or AGN [Kedron] Network Connection
                vendor: Intel Corporation
                physical id: 0
                bus info: pci@0000:0b:00.0
                logical name: wlan0
                version: 61
                serial: 00:1f:3b:99:d1:71
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                configuration: broadcast=yes driver=iwlagn driverversion=2.6.38-11-generic firmware=228.61.2.24 ip=192.168.1.20 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn

spci : 0b:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)
 
Dmesg quand le soucis est rencontré :
[ 1303.591467] wlan0: authenticate with 00:24:d4:cf:4b:28 (try 1)
[ 1303.593560] wlan0: authenticated
[ 1303.593590] wlan0: associate with 00:24:d4:cf:4b:28 (try 1)
[ 1303.596294] wlan0: RX AssocResp from 00:24:d4:cf:4b:28 (capab=0x11 status=0 aid=3)
[ 1303.596297] wlan0: associated
[ 1920.656749] iwlagn 0000:0b:00.0: Microcode SW error detected.  Restarting 0x82000000.
[ 1920.656762] iwlagn 0000:0b:00.0: Loaded firmware version: 228.61.2.24
[ 1920.656784] iwlagn 0000:0b:00.0: Start IWL Error Log Dump:
[ 1920.656791] iwlagn 0000:0b:00.0: Status: 0x000213E4, count: 5
[ 1920.656954] iwlagn 0000:0b:00.0: Desc                                  Time       data1      data2      line
[ 1920.656965] iwlagn 0000:0b:00.0: FH_ERROR                     (0x000C) 4256878651 0x00000008 0x03130000 208
[ 1920.656971] iwlagn 0000:0b:00.0: pc      blink1  blink2  ilink1  ilink2  hcmd
[ 1920.656980] iwlagn 0000:0b:00.0: 0x0046C 0x05CB2 0x004C2 0x006DE 0x018B8 0x4E300A8
[ 1920.656986] iwlagn 0000:0b:00.0: FH register values:
[ 1920.657006] iwlagn 0000:0b:00.0:         FH_RSCSR_CHNL0_STTS_WPTR_REG: 0X0323ce00
[ 1920.657027] iwlagn 0000:0b:00.0:        FH_RSCSR_CHNL0_RBDCB_BASE_REG: 0X00322400
[ 1920.657047] iwlagn 0000:0b:00.0:                  FH_RSCSR_CHNL0_WPTR: 0X000000a0
[ 1920.657066] iwlagn 0000:0b:00.0:         FH_MEM_RCSR_CHNL0_CONFIG_REG: 0X00819004
[ 1920.657086] iwlagn 0000:0b:00.0:          FH_MEM_RSSR_SHARED_CTRL_REG: 0X0000003c
[ 1920.657106] iwlagn 0000:0b:00.0:            FH_MEM_RSSR_RX_STATUS_REG: 0X03130000
[ 1920.657126] iwlagn 0000:0b:00.0:    FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV: 0X00000000
[ 1920.657146] iwlagn 0000:0b:00.0:                FH_TSSR_TX_STATUS_REG: 0X07ff0002
[ 1920.657166] iwlagn 0000:0b:00.0:                 FH_TSSR_TX_ERROR_REG: 0X00000000
[ 1920.657230] iwlagn 0000:0b:00.0: Start IWL Event Log Dump: display last 20 entries
[ 1920.657256] iwlagn 0000:0b:00.0: EVT_LOGT:4256878085:0x000000d4:0321
[ 1920.657273] iwlagn 0000:0b:00.0: EVT_LOGT:4256878086:0x00000000:1350
[ 1920.657289] iwlagn 0000:0b:00.0: EVT_LOGT:4256878086:0x00000000:1351
[ 1920.657306] iwlagn 0000:0b:00.0: EVT_LOGT:4256878087:0x00000000:1352
[ 1920.657323] iwlagn 0000:0b:00.0: EVT_LOGT:4256878087:0x00000003:1353
[ 1920.657340] iwlagn 0000:0b:00.0: EVT_LOGT:4256878093:0x00000008:0357
[ 1920.657356] iwlagn 0000:0b:00.0: EVT_LOGT:4256878397:0x00000000:0302
[ 1920.657373] iwlagn 0000:0b:00.0: EVT_LOGT:4256878431:0x000000d4:0321
[ 1920.657389] iwlagn 0000:0b:00.0: EVT_LOGT:4256878433:0x00000000:1350
[ 1920.657405] iwlagn 0000:0b:00.0: EVT_LOGT:4256878433:0x00000000:1351
[ 1920.657422] iwlagn 0000:0b:00.0: EVT_LOGT:4256878434:0x00000000:1352
[ 1920.657439] iwlagn 0000:0b:00.0: EVT_LOGT:4256878434:0x00000003:1353
[ 1920.657455] iwlagn 0000:0b:00.0: EVT_LOGT:4256878442:0x00000009:0357
[ 1920.657472] iwlagn 0000:0b:00.0: EVT_LOGT:4256878606:0x00000000:0302
[ 1920.657489] iwlagn 0000:0b:00.0: EVT_LOGT:4256878641:0x000000d4:0321
[ 1920.657505] iwlagn 0000:0b:00.0: EVT_LOGT:4256878642:0x00000000:1350
[ 1920.657521] iwlagn 0000:0b:00.0: EVT_LOGT:4256878642:0x00000000:1351
[ 1920.657538] iwlagn 0000:0b:00.0: EVT_LOGT:4256878643:0x00000000:1352
[ 1920.657554] iwlagn 0000:0b:00.0: EVT_LOGT:4256878643:0x00000003:1353
[ 1920.657571] iwlagn 0000:0b:00.0: EVT_LOGT:4256878654:0x00000000:0125
[ 2542.247654] wlan0: deauthenticating from 00:24:d4:cf:4b:28 by local choice (reason=3)

iwlagn                284745  0  
iwlcore               148964  1 iwlagn
mac80211              257001  2 iwlagn,iwlcore
cfg80211              156212  3 iwlagn,iwlcore,mac80211

root@jul-XPS-M1530:~# iwconfig  
lo        no wireless extensions.
 
eth0      no wireless extensions.
 
wlan0     IEEE 802.11abgn  ESSID:"Freeboxhaha"  
          Mode:Managed  Frequency:2.427 GHz  Access Point: 00:24:D4:CF:4B:28    
          Bit Rate=54 Mb/s   Tx-Power=15 dBm    
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=70/70  Signal level=-40 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:58   Missed beacon:0