[Bug 610078] [NEW] Corrupted downloads and WiFi disconnects on ath5k devices due to ASPM L0s hardware bug

[Roman Yepishev]

Public bug reported:

Some Atheros WiFi devices that can be found in Acer laptops and netbooks
start misbehaving when they are under load and ASPM L0s is enabled.

This can be seen when the card is transmitting the data at a high rate,
then the connection drops for some period of time and later on it is
resumed. Usually this is accompanied by the corruption of the downloaded
data (i.e. md5sum mismatch).

According to ath5k mailing list[1], this is a bug in the hardware and
even the drivers for MS Windows are disabling L0s and leave L1 enabled.

It looks like there are no approved patches for this so it is possible
to work-around the issue by using enable-aspm script from [2] by
adjusting ASPM_SETTING to be set to 2 (L1 only) and filling out
root_complex/endpoint addresses.

[1] https://lists.ath5k.org/pipermail/ath5k-devel/2010-June/003846.html
[2] http://linuxwireless.org/en/users/Documentation/ASPM

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-24-generic 2.6.32-24.38
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-24.38-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
AplayDevices: aplay: device_list:223: no soundcards found...
Architecture: i386
ArecordDevices: arecord: device_list:223: no soundcards found...
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer', '/dev/sequencer2', '/dev/sequencer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory
Date: Mon Jul 26 14:41:38 2010
HibernationDevice: RESUME=UUID=e17a5d0e-4532-4135-ad05-51c5dba93a6c
MachineType: Acer AOA150
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic root=UUID=0cb47387-b208-4eee-8148-c0173619b8e1 ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34.1
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: no
 	Hard blocked: no
SourcePackage: linux
WpaSupplicantLog:
 
dmi.bios.date: 10/06/2008
dmi.bios.vendor: Acer
dmi.bios.version: v0.3310
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.vendor: Acer
dmi.board.version: Base Board Version
dmi.chassis.type: 1
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAcer:bvrv0.3310:bd10/06/2008:svnAcer:pnAOA150:pvr1:rvnAcer:rn:rvrBaseBoardVersion:cvnChassisManufacturer:ct1:cvrChassisVersion:
dmi.product.name: AOA150
dmi.product.version: 1
dmi.sys.vendor: Acer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 lucid needs-upstream-testing networking ubuntu-une ubuntu-unity

-- 
Corrupted downloads and WiFi disconnects on ath5k devices due to ASPM L0s hardware bug
https://bugs.launchpad.net/bugs/610078
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