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
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https://bugs.launchpad.net/bugs/721449
Title:
slow wifi (atheros driver issue)
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