Bonjour,

Il y a quelques mois, j'ai installé Ubuntu 9.10 Karmic Koala et j'ai été comblé ; ma connexion wifi a fonctionné parfaitement (carte wifi reconnue automatiquement). Récemment j'ai fait une mise à niveau vers ubuntu 10.04 - Lucid Lynx à partir de Karmic. (un vrai désastre !)

Je suis reparti de zéro , en supprimant la partition Lucid Lynx et une réinstallation à partir de son Live-CD.
Utilisateur "confirmé" sous Windows (je ne sais pas programmé) , débutant sous Linux.

Après avoir terminé l'installation d'ubuntu Lucid Lynx , ma carte wifi était reconnue , je pouvais me connecter au réseau mais quand je voulais accéder à un site internet ou un autre, plusieurs, ... rien ! impossible d'afficher sauf en insistant pour aller sur www.google.fr et c'est tout !

J'ai cherché à résoudre mon problème par internet et aujourd'hui je l'ai résolu en parti , j'ai installé Ndiswrapper et son interface graphique, repris le pilote XP de ma carte wifi livré avec mon PC portable mais voilà après un certain temps (durée aléatoire) ma connexion internet ne reste pas et pourtant l'icone wifi est toujours actif indiquant que la connexion est toujours présente; pour retrouver ma connexion internet je suis obligé de me déconnecter et me connecter à nouveau et ceci en boucle ...

Je n'avais pas ce problème sous Karmic et je n'ai pas installé Ndiswrapper. Peut-on récupérer ce pilote dans Karmic et l'installer dans Lucid ? D'autre part, après installation et en utilisant Ndiswrapper j'ai constaté une baisse du signal wifi alors qu'avant pour cette même carte et ordi placé au même endroit le signal était proche de 50% actuellement ce signal est de 30-35%.

Aujourd'hui j'appel à l'aide les linuxiens ,

les commandes :
- cat /etc/lsb-release

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04 LTS"

lsusb

Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 046d:c03d Logitech, Inc. M-BT96a Pilot Optical Mouse
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

lspci
00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 10)
00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:04.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:12.0 IDE interface: ATI Technologies Inc IXP SB400 Serial ATA Controller (rev 80)
00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80)
00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80)
00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller (rev 80)
00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 83)
00:14.1 IDE interface: ATI Technologies Inc IXP SB400 IDE Controller (rev 80)
00:14.2 Audio device: ATI Technologies Inc IXP SB4x0 High Definition Audio Controller (rev 01)
00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80)
00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge (rev 80)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:05.0 VGA compatible controller: ATI Technologies Inc RS482 [Radeon Xpress 200M]
05:03.0 Ethernet controller: Atheros Communications Inc. AR2413 802.11bg NIC (rev 01)
05:04.0 FireWire (IEEE 1394): O2 Micro, Inc. Firewire (IEEE 1394) (rev 02)
05:04.2 SD Host controller: O2 Micro, Inc. Integrated MMC/SD Controller (rev 01)
05:04.3 Mass storage controller: O2 Micro, Inc. Integrated MS/xD Controller (rev 01)
05:05.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)

lspci -nn | grep -i net
05:03.0 Ethernet controller [0200]: Atheros Communications Inc. AR2413 802.11bg NIC [168c:001a] (rev 01)
05:05.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ [10ec:8139] (rev 10)

sudo lshw -C network
[sudo] password for francois: 
  *-network:0             
       description: Wireless interface
       product: AR2413 802.11bg NIC
       vendor: Atheros Communications Inc.
       physical id: 3
       bus info: pci@0000:05:03.0
       logical name: wlan0
       version: 01
       serial: 00:c0:a8:d5:fa:c8
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=ndiswrapper+net5211 driverversion=1.55+,06/29/2006,5.0.0.107 ip=10.0.1.7 latency=128 link=yes maxlatency=28 mingnt=10 multicast=yes wireless=IEEE 802.11g
       resources: irq:23 memory:c0200000-c020ffff
  *-network:1
       description: Ethernet interface
       product: RTL-8139/8139C/8139C+
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 5
       bus info: pci@0000:05:05.0
       logical name: eth0
       version: 10
       serial: 00:03:0d:56:53:79
       size: 10MB/s
       capacity: 100MB/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=8139too driverversion=0.9.28 duplex=half latency=64 link=no maxlatency=64 mingnt=32 multicast=yes port=MII speed=10MB/s
       resources: irq:21 ioport:a000(size=256) memory:c0210c00-c0210cff
  *-network DISABLED
       description: Ethernet interface
       physical id: 2
       logical name: vboxnet0
       serial: 0a:00:27:00:00:00
       capabilities: ethernet physical
       configuration: broadcast=yes multicast=yes

lsmod
Module                  Size  Used by
binfmt_misc             6587  1 
ppdev                   5259  0 
vboxnetadp              6326  0 
vboxnetflt             15162  0 
vboxdrv               190377  2 vboxnetadp,vboxnetflt
snd_hda_codec_realtek   203168  1 
snd_hda_codec_si3054     3396  1 
fbcon                  35102  71 
tileblit                2031  1 fbcon
font                    7557  1 fbcon
bitblit                 4707  1 fbcon
softcursor              1189  1 bitblit
vga16fb                11385  0 
vgastate                8961  1 vga16fb
snd_hda_intel          21877  5 
snd_hda_codec          74201  3 snd_hda_codec_realtek,snd_hda_codec_si3054,snd_hda_intel
snd_hwdep               5412  1 snd_hda_codec
snd_pcm_oss            35308  0 
snd_mixer_oss          13746  1 snd_pcm_oss
snd_pcm                70662  6 snd_hda_codec_si3054,snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_seq_dummy           1338  0 
snd_seq_oss            26726  0 
snd_seq_midi            4557  0 
snd_rawmidi            19056  1 snd_seq_midi
snd_seq_midi_event      6003  2 snd_seq_oss,snd_seq_midi
snd_seq                47263  6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer              19098  2 snd_pcm,snd_seq
snd_seq_device          5700  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
radeon                674135  3 
snd                    54148  21 snd_hda_codec_realtek,snd_hda_codec_si3054,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
ttm                    49943  1 radeon
drm_kms_helper         29297  1 radeon
ati_agp                 5094  0 
drm                   162471  5 radeon,ttm,drm_kms_helper
i2c_algo_bit            5028  1 radeon
sdhci_pci               5470  0 
sdhci                  15462  1 sdhci_pci
led_class               2864  1 sdhci
ndiswrapper           184677  0 
psmouse                63245  0 
serio_raw               3978  0 
video                  17375  0 
output                  1871  1 video
k8temp                  3024  0 
i2c_piix4               8335  0 
soundcore               6620  1 snd
snd_page_alloc          7076  2 snd_hda_intel,snd_pcm
agpgart                31724  3 ttm,ati_agp,drm
shpchp                 28820  0 
lp                      7028  0 
parport                32635  2 ppdev,lp
8139too                18545  0 
usbhid                 36110  0 
ohci1394               26950  0 
8139cp                 16186  0 
hid                    67032  1 usbhid
mii                     4381  2 8139too,8139cp
ieee1394               81181  1 ohci1394
pata_atiixp             3148  0 
sata_sil                6959  3

iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11g  ESSID:"homenet"  
          Mode:Managed  Frequency:2.467 GHz  Access Point: 00:11:24:25:7C:F4   
          Bit Rate=54 Mb/s   
          Power Managementff
          Link Quality:26/100  Signal level:-79 dBm  Noise level:-96 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

vboxnet0  no wireless extensions.

ifconfig
eth0      Link encap:Ethernet  HWaddr 00:03:0d:56:53:79  
          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  Octets transmis:0 (0.0 
          Interruption:21 Adresse de base:0xa000 

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:28 erreurs:0 :0 overruns:0 frame:0
          TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0 
          Octets reçus:1680 (1.6 K Octets transmis:1680 (1.6 K

wlan0     Link encap:Ethernet  HWaddr 00:c0:a8:d5:fa:c8  
          inet adr:10.0.1.7  Bcast:10.0.1.255  Masque:255.255.255.0
          adr inet6: fe80::2c0:a8ff:fed5:fac8/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:19596 erreurs:0 :0 overruns:0 frame:0
          TX packets:10560 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:28707093 (28.7 M Octets transmis:748185 (748.1 K
          Interruption:23 Mémoire:c0200000-c0210000

sudo iwlist scan
lo        Interface doesn't support scanning.

eth0      Interface doesn't support scanning.

wlan0     Scan completed :
          Cell 01 - Address: 00:11:24:25:7C:F4
                    ESSID:"homenet"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.467 GHz (Channel 12)
                    Quality:29/100  Signal level:-77 dBm  Noise level:-96 dBm
                    Encryption keyn
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
                              11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0
                    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 (1) : TKIP
                        Authentication Suites (1) : PSK
          Cell 02 - Address: 00:11:24:A75:85
                    ESSID:"homenet"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.467 GHz (Channel 12)
                    Quality:6/100  Signal level:-92 dBm  Noise level:-96 dBm
                    Encryption keyn
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
                              11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0
                    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 (1) : TKIP
                        Authentication Suites (1) : PSK
          Cell 03 - Address: 00:25:4B:03:FA:7B
                    ESSID:"homenet"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.467 GHz (Channel 12)
                    Quality:6/100  Signal level:-92 dBm  Noise level:-96 dBm
                    Encryption keyn
                    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; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0
                    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 (1) : TKIP
                        Authentication Suites (1) : PSK
          Cell 04 - Address: 92:6B:E3:66:50:89
                    ESSID:"WASC-001641c11dc0-PHILIPS"
                    Protocol:IEEE 802.11g
                    Mode:Ad-Hoc
                    Frequency:2.462 GHz (Channel 11)
                    Quality:62/100  Signal level:-56 dBm  Noise level:-96 dBm
                    Encryption keyn
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0
          Cell 05 - Address: 00:17:33A5:F9
                    ESSID:"Neuf WiFi"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.462 GHz (Channel 11)
                    Quality:15/100  Signal level:-86 dBm  Noise level:-96 dBm
                    Encryption keyff
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0
          Cell 06 - Address: 00:1D:6A:C2:C9:1E
                    ESSID:"Livebox-76A6"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.412 GHz (Channel 1)
                    Quality:12/100  Signal level:-88 dBm  Noise level:-96 dBm
                    Encryption keyn
                    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; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (1) : TKIP
                        Authentication Suites (1) : PSK
          Cell 07 - Address: 00:17:33A5:F8
                    ESSID:"NEUF_D5F4"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.462 GHz (Channel 11)
                    Quality:14/100  Signal level:-87 dBm  Noise level:-96 dBm
                    Encryption keyn
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
          Cell 08 - Address: 00:17:33A5:FA
                    ESSID:"SFR WiFi Public"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.462 GHz (Channel 11)
                    Quality:14/100  Signal level:-87 dBm  Noise level:-96 dBm
                    Encryption keyff
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0

vboxnet0  Interface doesn't support scanning.

uname -r -m
2.6.32-22-generic i686

cat  /etc/network/interfaces
auto lo
iface lo inet loopback

nm-tool

NetworkManager Tool

State: connected

- Device: wlan0  [Auto homenet] ------------------------------------------------
  Type:              802.11 WiFi
  Driver:            ndiswrapper
  State:             connected
  Default:           yes
  HW Address:        00:C0:A85:FA:C8

  Capabilities:
    Speed:           54 Mb/s

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

  Wireless Access Points (* = current AP)
    *homenet:        Infra, 00:11:24:25:7C:F4, Freq 2467 MHz, Rate 54 Mb/s, Strength 25 WPA WPA2
    homenet:         Infra, 00:11:24:A75:85, Freq 2467 MHz, Rate 54 Mb/s, Strength 34 WPA WPA2
    homenet:         Infra, 00:25:4B:03:FA:7B, Freq 2467 MHz, Rate 54 Mb/s, Strength 20 WPA WPA2
    SFR WiFi Public: Infra, 00:17:33A5:FA, Freq 2462 MHz, Rate 54 Mb/s, Strength 15
    NEUF_D5F4:       Infra, 00:17:33A5:F8, Freq 2462 MHz, Rate 54 Mb/s, Strength 15 WPA
    Neuf WiFi:       Infra, 00:17:33A5:F9, Freq 2462 MHz, Rate 54 Mb/s, Strength 15
    WASC-001641c11dc0-PHILIPS: Ad-Hoc, 92:6B:E3:66:50:89, Freq 2462 MHz, Rate 54 Mb/s, Strength 15 WEP
    Livebox-76A6:    Infra, 00:1D:6A:C2:C9:1E, Freq 2412 MHz, Rate 54 Mb/s, Strength 7 WPA

  IPv4 Settings:
    Address:         10.0.1.7
    Prefix:          24 (255.255.255.0)
    Gateway:         10.0.1.1

    DNS:             10.0.1.1


- Device: eth0 -----------------------------------------------------------------
  Type:              Wired
  Driver:            8139too
  State:             unavailable
  Default:           no
  HW Address:        00:03:0D:56:53:79

  Capabilities:
    Carrier Detect:  yes
    Speed:           10 Mb/s

  Wired Properties
    Carrier:         off

voila pour les résultats des commandes, merci d'avance pour votre aide,

Poste le Thursday 3 June 2010 20:11:51