linux-kernel - Re: changing the default cpufreq governor freezes laptop on suspend

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Date:	Sun, 19 Sep 2010 22:23:46 +0200
From:	Lukas Grässlin <lukasgraesslin@....de>
To:	Norbert Preining <preining@...ic.at>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: changing the default cpufreq governor freezes laptop on suspend

Are there any news? I have exactly the same problem with stable 2.6.35.

It's not so a dramatic bug because the workaround (settings that
temporarily govenor in the pm-utils script to something that does not
exist, which means it is skipped) is ok and has actually no byeffects,
but it would still be nice to have that fixed :)

On Fri, Jul 23, 2010 at 10:15:14AM +0900, Norbert Preining wrote:
> Dear all,
> 
> (please Cc)
> 
> some time ago I switched from 2.6.35-rc1 to -rc2 and about the same time
> I regularly got problems with suspend to ram. I first thought that this
> is a graphics card issue 
> (see http://marc.info/?l=linux-kernel&m=127582534931581&w=2)
> but it turned out that using echo mem > /sys/power/state works very
> reliable.
> 
> I finally got around to check the scripts of pm-utils managing the
> suspend process here on Debian/sid, and I found that one of the
> scripts, before going to sleep, changes the default cpufreq governor
> to performance, doing in principle:
> 	cat /sys/devices/system/cpu/cpuN/cpufreq/scaling_governor > savedstate
> 	echo "performance" > /sys/.....
> Interestingly, as soon as I disabled these two line the suspend process
> became again as stable as before using pm-utils, and as stable as the
> echo mem method.
> 
> My laptop is intel core2:
> Intel(R) Core(TM)2 Duo CPU     P9500  @ 2.53GHz
> running Debian/sid, on self compiled git kernels pulled from Linus' repo.
> 
> Please let me know what further information I can provide, or how to help
> 
> Best wishes
> 
> Norbert
> ------------------------------------------------------------------------
> Norbert Preining            preining@...ist.ac.jp, logic.at, debian.org}
> JAIST, Japan                                 TeX Live & Debian Developer
> DSA: 0x09C5B094   fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
> ------------------------------------------------------------------------
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-- 
Lukas Grässlin
GnuPG-Key: http://lg.ath.cx/lukasgraesslin@gmx.de.asc
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