On a Thinkpad x201, on today's Precise:
wifi works reliably in general, but under heavy load it will fail: receiving no traffic, but not giving any obvious errors
To produce enough load, I started downloading several Ubuntu ISOs from remote servers. This works for a variable period of time, sometimes a few minutes, topping out at 2MB/s, which is about my ADSL peak speed.
At moderate load it can work all day, including across suspend/resume cycles, so at least the symptoms are different to bug 948235 and bug 956401, though perhaps the cause is the same.
Running 'sudo rmmod iwlwifi && sudo modprobe iwlwifi' gets it working again.
This seems like it might be a regression but I'm not sure. I'll try an old kernel.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image (not installed)
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: mbp 2516 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf2520000 irq 45'
Mixer name : 'Intel IbexPeak HDMI'
Components : 'HDA:14f15069,17aa2155,00100302 HDA:80862804,17aa21b5,00100000'
Controls : 14
Simple ctrls : 6
Card29.Amixer.info:
Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6QHT33WW-1.14'
Mixer name : 'ThinkPad EC 6QHT33WW-1.14'
Components : ''
Controls : 1
Simple ctrls : 1
Card29.Amixer.values:
Simple mixer control 'Console',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Date: Fri Mar 16 17:29:05 2012
HibernationDevice: RESUME=UUID=0cb56ab7-6b06-46a9-bc17-9de56aae544a
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120128)
MachineType: LENOVO 3249CTO
ProcEnviron:
LANGUAGE=en_AU:en
TERM=xterm
PATH=(custom, user)
LANG=en_AU.UTF-8
SHELL=/usr/bin/zsh
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-18-generic root=/dev/mapper/sda6_crypt ro rootflags=subvol=@ quiet splash drm.debug=0xe vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-18-generic N/A
linux-backports-modules-3.2.0-18-generic N/A
linux-firmware 1.71
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/31/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 6QET66WW (1.36 )
dmi.board.name: 3249CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6QET66WW(1.36):bd05/31/2011:svnLENOVO:pn3249CTO:pvrThinkPadX201:rvnLENOVO:rn3249CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 3249CTO
dmi.product.version: ThinkPad X201
dmi.sys.vendor: LENOVO
It looks like (bearing in mind this is somewhat intermittent) that this problem does not exist in the upstream kernel:
Linux joy 3.3.0-030300rc7
(at least, I have downloaded a few hundred MB at 1.5MB/s over wireless with no problems yet.)