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

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Date:	Fri, 15 Jun 2007 20:54:28 -0400
From:	Dave Jones <davej@...hat.com>
To:	S.Çağlar Onur <caglar@...dus.org.tr>
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

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  ?

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

	Dave

-- 
http://www.codemonkey.org.uk
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