linux-kernel - Re: [BUG] Interesting race between cpufreq_ondemand and snd

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Message-Id: <200706161444.08999.caglar@pardus.org.tr>
Date:	Sat, 16 Jun 2007 14:44:08 +0300
From:	"S.Çağlar Onur" <caglar@...dus.org.tr>
To:	Dave Jones <davej@...hat.com>
Cc:	linux-kernel@...r.kernel.org, cpufreq@...ts.linux.org.uk,
	tiwai@...e.de
Subject: Re: [BUG] Interesting race between cpufreq_ondemand and snd_atiixp

Hi;

16 Haz 2007 Cts tarihinde, Dave Jones şunları yazmıştı: 
> On Sat, Jun 16, 2007 at 02:33:41AM +0300, S.Çağlar Onur wrote:
>  > One of our colleagues found following problem with his old laptop while
>  > testing Linus's latest git with external alsa-driver (v1.0.14). And we
>  > can also reproduce same problem with 2.6.18.8 so it seems not a new
>  > regression (if it is a regression).
>  >
>  > As a summary "sound stops to work if cpufreq_ondemand governor is used"
>  > on that laptop. Problem occurs only if cpufreq_* modules are loaded and
>  > %100 reproducable if system configured for ondemand governor.
>
> I'm puzzled.  The cpuinfo shows that this cpu doesn't have speedstep, so
> why acpi-cpufreq successfully loads is a mystery.
>
> What's in/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
>  ?

mavi ~ # 
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
2793000 1596000

> Maybe the acpi implementation is faking multiple speeds using throttling
> a la p4-clockmod, which would be a bit loopy, but possible I guess.

modprobe p4-clockmod with 2.6.18.8 ends up with "Device or resource busy"

Cheers
-- 
S.Çağlar Onur <caglar@...dus.org.tr>
http://cekirdek.pardus.org.tr/~caglar/

Linux is like living in a teepee. No Windows, no Gates and an Apache in house!

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