Re: Suspend to RAM regression tracked down
From: Jeremy Fitzhardinge
Date: Sun Jul 02 2006 - 14:04:38 EST
Jean-Marc Valin wrote:
A while ago, I reported a suspend to RAM regression (fail to resume). I
have since then tracked down the regression to the changes between
2.6.12-rc5-git5 and 2.6.12-rc5-git6. On my laptop, I have only been able
to reproduce the problem with the ondemand cpufreq governor, but I've
head of another user with the same (Dell D600) laptop having problem
with the userspace governor as well. All the details are actually
http://bugzilla.kernel.org/show_bug.cgi?id=6166 but it seems like it's
being ignored. It's currently assigned to the ACPI category, but maybe
it belongs to cpufreq? Anyone can help here?
There was a race in ondemand and conservative which made them lock up on
resume (possibly only on SMP systems though). There's a patch for that
in current -mm, but I suspect there's another problem (still haven't had
any time to track it down).
The workaround is to switch to one of the performance/powersave/user
governors just before suspend, and restore the governor on resume.
J
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