Comment 24 for bug 721449

It happens to me after upgrade 10.10 -> 11.04, but sometimes only.

$ uname -a
Linux turion 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

$ lspci -v
05:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01)
 Subsystem: Askey Computer Corp. Device 7141
 Flags: bus master, fast devsel, latency 0, IRQ 18
 Memory at d3200000 (64-bit, non-prefetchable) [size=64K]
 Capabilities: <access denied>
 Kernel driver in use: ath9k
 Kernel modules: ath9k

Bug isn't in older kernel 2.6.35