Richard Schütz | 22 Jan 21:38 2011

ath9k prevents CPU from entering C4 state (kernel 2.6.37 regression)

I noticed that from kernel 2.6.37 on (i've tested 2.6.38-rc2, too) ath9k 
prevents my CPU (Intel Atom N450) from entering the C4 power state. It 
only goes down to C2 (there's no C3) instead. In 2.6.36(.3) everything 
is still fine. The CPU will only go down to C4 with 2.6.37 when the 
wireless interface is brought down.

used wireless device:
05:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless 
Network Adapter (PCI-Express) (rev 01)


Richard Schütz
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