From: Norbert Preining <preining@logic.at>
To: linux-kernel@vger.kernel.org
Subject: changing the default cpufreq governor freezes laptop on suspend
Date: Fri, 23 Jul 2010 10:15:14 +0900 [thread overview]
Message-ID: <20100723011514.GD19985@gamma.logic.tuwien.ac.at> (raw)
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@{jaist.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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in the office.
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next reply other threads:[~2010-07-23 1:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-23 1:15 Norbert Preining [this message]
2010-09-19 20:23 ` Lukas Grässlin
2010-09-21 2:06 ` Norbert Preining
2010-09-25 17:44 ` Lukas Grässlin
2010-09-27 1:01 ` Norbert Preining
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