When copying a large set of file on an smb share over wifi, the wifi connection breaks (Regression)

Hello,

This morning I tried to copy 1.4Go of files. After some Mo are copied, the wifi connection breaks with no way to bring it back. Sometime it keeps asking for the wifi pasword. Sometimes it say the physical wifi switch is off but there is no physical wifi switch on my laptop.

I can reproduce that bug every time and so I am unable to copy those files.

As the wifi drop and I have toi reboot, I include the syslog and dmesg logs I get when the error occurs.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image (not installed)
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: NVidia [HDA NVidia], device 0: ALC662 rev1 Analog [ALC662 rev1 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: lox 1872 F.... pulseaudio
CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xfae78000 irq 23'
   Mixer name : 'Realtek ALC662 rev1'
   Components : 'HDA:10ec0662,104316f3,00100101'
   Controls : 19
   Simple ctrls : 10
Date: Thu Apr 14 09:07:19 2011
HibernationDevice: RESUME=UUID=21946c0e-dc41-47f8-a6bf-2f62631e01e8
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 003: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
 Bus 001 Device 002: ID 04f2:b071 Chicony Electronics Co., Ltd 2.0M UVC Webcam / CNF7129
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: ASUSTeK Computer Inc. K50IN
ProcEnviron:
 LANGUAGE=fr_FR:en
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=6f3ebf8f-6489-4e06-99e2-359b90afbb4b ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic N/A
 linux-firmware 1.50
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to natty on 2011-04-03 (10 days ago)
dmi.bios.date: 01/22/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 222
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: K50IN
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr222:bd01/22/2010:svnASUSTeKComputerInc.:pnK50IN:pvr1.0:rvnASUSTeKComputerInc.:rnK50IN:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr:
dmi.product.name: K50IN
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.