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Déconnexions successives et network-manager affiche "non disponible"

Bonjour à tous ! 

J'ai un soucis de wifi très instable avec mon ubuntu 12.04. J'ai pas mal bricolé dans les paramètres pour tenter de créer un réseau ad-hoc entre Ubuntu et une Debian, et j'ai dû faire quelque chose qui ne fallait pas. Maintenant, mon wifi arrive à se connecter mais se fait régulièrement éjecter du point d'accès. Je suis déconnectée quasiment systématiquement au bout de 2 ou 3 minutes. Et au bout d'un certain nombre de déconnexions, le network-manager m'affiche pour le Wifi : «non disponible». Un redémarrage du network-manager avec la commande "service network-manager restart" suffit à le faire repartir jusqu'à la prochaine déconnexion.

Voici le résultat du dmesg quand je suis déconnectée du réseau :

[ 3795.913817] wlan0: authenticate with 00:09:5b:4f:68:a4 (try 1)
[ 3795.915583] wlan0: authenticated
[ 3795.919107] wlan0: associate with 00:09:5b:4f:68:a4 (try 1)
[ 3796.115433] wlan0: associate with 00:09:5b:4f:68:a4 (try 2)
[ 3796.118375] wlan0: RX ReassocResp from 00:09:5b:4f:68:a4 (capab=0x15 status=0 aid=154)
[ 3796.118384] wlan0: associated
[ 3856.152303] cfg80211: All devices are disconnected, going to restore regulatory settings
[ 3856.152320] cfg80211: Restoring regulatory settings
[ 3856.152330] cfg80211: Calling CRDA to update world regulatory domain
[ 3856.161015] cfg80211: Ignoring regulatory request Set by core since the driver uses its own custom regulatory domain
[ 3856.161025] cfg80211: World regulatory domain updated:
[ 3856.161029] cfg80211:     (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 3856.161036] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 3856.161043] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 3856.161049] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 3856.161054] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 3856.161060] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 3859.324668] wlan0: authenticate with 00:09:5b:4f:68:a4 (try 1)
[ 3859.326287] wlan0: authenticated
[ 3859.327396] wlan0: associate with 00:09:5b:4f:68:a4 (try 1)
[ 3859.524150] wlan0: associate with 00:09:5b:4f:68:a4 (try 2)
[ 3859.723998] wlan0: associate with 00:09:5b:4f:68:a4 (try 3)
[ 3859.923902] wlan0: association with 00:09:5b:4f:68:a4 timed out

Et voici le Wificheck.log :

>>    cat /etc/lsb-release 

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.1 LTS"

>>    lsusb 

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:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 003: ID 138a:003c Validity Sensors, Inc. VFS471 Fingerprint Reader
Bus 002 Device 003: ID 1bcf:2805 Sunplus Innovation Technology Inc. 
Bus 002 Device 005: ID 03f0:231d Hewlett-Packard 

>>    lspci -k -nn | grep -A 3 -i net 

00:19.0 Ethernet controller [0200]: Intel Corporation 82579LM Gigabit Network Connection [8086:1502] (rev 04)
	Subsystem: Hewlett-Packard Company Device [103c:161c]
	Kernel driver in use: e1000e
	Kernel modules: e1000e
--
24:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6205 [8086:0085] (rev 34)
	Subsystem: Intel Corporation Centrino Advanced-N 6205 AGN [8086:1311]
	Kernel driver in use: iwlwifi
	Kernel modules: iwlwifi

>>    sudo lshw -C network 

  *-network
       description: Ethernet interface
       produit: 82579LM Gigabit Network Connection
       fabriquant: Intel Corporation
       identifiant matériel: 19
       information bus: pci@0000:00:19.0
       nom logique: eth0
       version: 04
       numéro de série: e4:11:5b:4b:36:df
       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=1.5.1-k firmware=0.13-4 latency=0 link=no multicast=yes port=twisted pair
       ressources: irq:52 mémoire:d4800000-d481ffff mémoire:d482a000-d482afff portE/S:4060(taille=32)
  *-network
       description: Interface réseau sans fil
       produit: Centrino Advanced-N 6205
       fabriquant: Intel Corporation
       identifiant matériel: 0
       information bus: pci@0000:24:00.0
       nom logique: wlan0
       version: 34
       numéro de série: 10:0b:a9:cb:76:f0
       bits: 64 bits
       horloge: 33MHz
       fonctionnalités: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=3.2.0-35-generic firmware=18.168.6.1 latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
       ressources: irq:54 mémoire:d4500000-d4501fff

>>    lsmod 

Module                  Size  Used by
nls_iso8859_1          12713  0 
nls_cp437              16991  0 
vfat                   17585  0 
fat                    61512  1 vfat
usb_storage            49198  0 
pci_stub               12622  1 
vboxpci                23237  0 
vboxnetadp             13382  0 
vboxnetflt             23478  0 
vboxdrv               287082  3 vboxpci,vboxnetadp,vboxnetflt
dm_crypt               23125  1 
tpm_infineon           17536  0 
snd_hda_codec_hdmi     32474  1 
snd_hda_codec_idt      70795  1 
rfcomm                 47604  12 
bnep                   18281  2 
binfmt_misc            17540  1 
nfsd                  277884  2 
nfs                   356470  0 
lockd                  90326  2 nfsd,nfs
fscache                61529  1 nfs
auth_rpcgss            53380  2 nfsd,nfs
nfs_acl                12883  2 nfsd,nfs
sunrpc                245863  6 nfsd,nfs,lockd,auth_rpcgss,nfs_acl
joydev                 17693  0 
arc4                   12529  2 
hp_wmi                 18092  0 
sparse_keymap          13890  1 hp_wmi
ppdev                  17113  0 
uvcvideo               72627  0 
videodev               98259  1 uvcvideo
v4l2_compat_ioctl32    17128  1 videodev
btusb                  18332  2 
bluetooth             180153  23 rfcomm,bnep,btusb
snd_hda_intel          33773  3 
snd_hda_codec         127706  3 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel
snd_hwdep              17764  1 snd_hda_codec
snd_pcm                97275  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_seq_midi           13324  0 
iwlwifi               397059  0 
snd_rawmidi            30748  1 snd_seq_midi
mac80211              506862  1 iwlwifi
snd_seq_midi_event     14899  1 snd_seq_midi
cfg80211              205774  2 iwlwifi,mac80211
snd_seq                61929  2 snd_seq_midi,snd_seq_midi_event
psmouse                97485  0 
serio_raw              13211  0 
snd_timer              29990  2 snd_pcm,snd_seq
snd_seq_device         14540  3 snd_seq_midi,snd_rawmidi,snd_seq
snd                    79041  16 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore              15091  1 snd
snd_page_alloc         18529  2 snd_hda_intel,snd_pcm
mei                    41616  0 
parport_pc             32866  1 
tpm_tis                18804  0 
hp_accel               25976  0 
lis3lv02d              19876  1 hp_accel
input_polldev          13896  1 lis3lv02d
mac_hid                13253  0 
lp                     17799  0 
parport                46562  3 ppdev,parport_pc,lp
xfs                   836544  2 
wmi                    19256  1 hp_wmi
firewire_ohci          41000  0 
sdhci_pci              18826  0 
sdhci                  33205  1 sdhci_pci
firewire_core          63600  1 firewire_ohci
crc_itu_t              12707  1 firewire_core
e1000e                156715  0 
i915                  477545  3 
drm_kms_helper         46978  1 i915
drm                   241971  4 i915,drm_kms_helper
i2c_algo_bit           13423  1 i915
video                  19596  1 i915

>>    iwconfig 

wlan0     IEEE 802.11abgn  ESSID:off/any  
          Mode:Managed  Frequency:2.462 GHz  Access Point: Not-Associated   
          Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          

>>    ifconfig -a 

eth0      Link encap:Ethernet  HWaddr e4:11:5b:4b:36:df  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)
          Interruption:20 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:16436  Metric:1
          Packets reçus:25280 erreurs:0 :0 overruns:0 frame:0
          TX packets:25280 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0 
          Octets reçus:1619491 (1.6 MB) Octets transmis:1619491 (1.6 MB)

wlan0     Link encap:Ethernet  HWaddr 10:0b:a9:cb:76:f0  
          UP BROADCAST MULTICAST  MTU:1492  Metric:1
          Packets reçus:45957 erreurs:0 :0 overruns:0 frame:0
          TX packets:39562 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:60283185 (60.2 MB) Octets transmis:5156985 (5.1 MB)


>>    sudo iwlist scan 

wlan0     Scan completed :
          Cell 01 - Address: 00:09:5B:4F:68:A4
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=29/70  Signal level=-81 dBm  
                    Encryption key:on
                    ESSID:"Wifi Guests IPCC"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
                    Mode:Master
                    Extra:tsf=0000000f4b230185
                    Extra: Last beacon: 2980ms ago
                    IE: Unknown: 001057696669204775657374732049504343
                    IE: Unknown: 010482848B96
                    IE: Unknown: 03010B
                    IE: Unknown: 0406000200000000
                    IE: Unknown: 051600010014F7FF3F8336F43FEAC7F0DF3F05020031606A


>>    uname -r -m 

3.2.0-35-generic x86_64

>>    cat /etc/network/interfaces 

auto lo
iface lo inet loopback


>>    nm-tool 


NetworkManager Tool

State: disconnected

- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwlwifi
  State:             unavailable
  Default:           no
  HW Address:        10:0B:A9:CB:76:F0

  Capabilities:

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points 


- Device: eth0 -----------------------------------------------------------------
  Type:              Wired
  Driver:            e1000e
  State:             unavailable
  Default:           no
  HW Address:        E4:11:5B:4B:36:DF

  Capabilities:
    Carrier Detect:  yes

  Wired Properties
    Carrier:         off



>>    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: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no

Merci d'avance pour votre aide.