From: "Thomas Bächler" <thomas@archlinux.org>
To: Christian Lamparter <chunkeey@googlemail.com>
Cc: "Richard Schütz" <r.schtz@t-online.de>, linux-wireless@vger.kernel.org
Subject: Re: ath9k prevents CPU from entering C4 state (kernel 2.6.37 regression)
Date: Sun, 23 Jan 2011 00:49:33 +0100 [thread overview]
Message-ID: <4D3B6D0D.6070002@archlinux.org> (raw)
In-Reply-To: <201101222352.42913.chunkeey@googlemail.com>
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Am 22.01.2011 23:52, schrieb Christian Lamparter:
> On Saturday 22 January 2011 21:38:47 Richard Schütz wrote:
>> 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.
>
> "ath9k: Fix a DMA latency issue for Intel Pinetrail platforms."
> http://www.spinics.net/lists/linux-wireless/msg58264.html
I experience the same problem, and I do not have a Pinetrail. I run
Intel Core i5-520M (Arrandale) with an AR9280 Rev 2.
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prev parent reply other threads:[~2011-01-22 23:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-22 20:38 ath9k prevents CPU from entering C4 state (kernel 2.6.37 regression) Richard Schütz
2011-01-22 22:52 ` Christian Lamparter
2011-01-22 23:49 ` Thomas Bächler [this message]
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