From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 57871] New: Cpu frequency scaling not working after waking up
from suspend.
Date: Thu, 9 May 2013 14:08:29 +0000 (UTC)
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https://bugzilla.kernel.org/show_bug.cgi?id=57871
Summary: Cpu frequency scaling not working after waking up from
suspend.
Product: Power Management
Version: 2.5
Kernel Version: 3.9
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
AssignedTo: cpufreq@vger.kernel.org
ReportedBy: xdever@gmail.com
Regression: Yes
Created an attachment (id=101031)
--> (https://bugzilla.kernel.org/attachment.cgi?id=101031)
Dmesg, cpuinfo and kernel config
Environment: Thinkpad X220, Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz, Gentoo
Description. I use 3.9 mainline kernel, with intel_pstate disabled (with intel
pstate it uses ~0.2W more power when reading pdf document than without it).
Since kernel 3.9, when my machine wakes up from suspend, in about 1 cases out
of 3 the CPU scaling won't work and the CPU-s are stucked at 2.7GHz maximal
speed. The machine becomes hot. Top shows nothing using the cpu. When I notice
that the machine is hot, I put it back to suspend, and when I wake it up again
it works as it should.
Attachements: I attached dmesg, cpuinfo and my kernel configuration. The dmesg
is long since the machine is running more than 1 days, but in the resume before
the last it was overheating and in the last one it is not overheating.
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