[Bug 573689] [NEW] Severe packet loss with Atheros Wi-Fi and lucid kernel

[Jon Kåre Hellan]

Public bug reported:

With the lucid kernel, linux-image-2.6.32-21-generic, I'm seeing severe packet loss using Atheros wireless cards.
The loss is about 10%. This severely impacts network performance.

There was no packet loss with lucid and the Ubuntu kernel from karmic, nor with lucid and a kernel.org 2.6.33.3 kernel.
2.6.33.3 was built using make oldconfig and default answers to the new config options. Neither was there packet loss with
a Debian live CD running 2.6.32.

With the lucid kernel, I saw the same packet loss using both the ath5k driver and madwifi snapshots from September 2009 and
March 2010.

3 different  Atheros cards showed the same packet loss: An external
D-Link AG650, and two different mini-pci cards for Thinkpad T42p. lspci
describes the one i'm currently using as: "02:02.0 Ethernet controller:
Atheros Communications Inc. AR5212 802.11abg NIC (rev 01)" - PCI ID
168c:1014. I don't have other types of wireless cards available, apart
from an old Orinoco, which didn't work with Lucid.

I'm running a Thinkpad T42p with a 32 bit x86 Pentium M CPU.

Obviously, this is no radio interference problem, as I'm seeing
literally zero loss over 1000 pings with other kernels.

I've solved the problem for myself, but it may affect others.

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

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Severe packet loss with Atheros Wi-Fi and lucid kernel
https://bugs.launchpad.net/bugs/573689
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