From: bugzilla-daemon@bugzilla.kernel.org
To: cpufreq@vger.kernel.org
Subject: [Bug 58801] New: intel_pstate/powersave - cpu frequency remains at high level if if system is idle
Date: Sat, 25 May 2013 07:24:54 +0000 (UTC) [thread overview]
Message-ID: <bug-58801-12968@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=58801
Summary: intel_pstate/powersave - cpu frequency remains at high
level if if system is idle
Product: Power Management
Version: 2.5
Kernel Version: 3.9.3 and 3.9.4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
AssignedTo: cpufreq@vger.kernel.org
ReportedBy: c.h.l@web.de
Regression: Yes
I have a Lenovo T520 with a Intel(R) Core(TM) i5-2450M CPU and a Sandy Bridge
chipset.
Starting from kernel version 3.9.1 I switched the CPU frequency scaling driver
from acpi-cpufreq to intel_pstate. In combination with the powersave governor
it worked like a charm. I had higher frequencies due to the turbo boost (3.1
GHz instead of 2.5 GHz) and when the system was idle the frequency was switched
to the lowest values (around 800 MHz).
With the kernel versions 3.9.3 and now even 3.9.4 the frequency remains at a
quite high frequency (3.0 or 2.9 GHz) even if the the system is completely
idle.
As I have not changed the kernel-config when I updated to the versions 3.9.3
and 3.9.4 I assume some bug was introduced in the kernel as of 3.9.3.
Please let me know if you need any further info.
Christoph
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next reply other threads:[~2013-05-25 7:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-25 7:24 bugzilla-daemon [this message]
2013-05-25 9:07 ` [Bug 58801] intel_pstate/powersave - cpu frequency remains at high level if if system is idle bugzilla-daemon
2013-05-25 9:16 ` [Bug 58801] New: " Rafael J. Wysocki
2013-05-25 9:39 ` [Bug 58801] " bugzilla-daemon
2013-05-25 14:57 ` bugzilla-daemon
2013-05-25 16:30 ` bugzilla-daemon
2013-05-25 17:34 ` bugzilla-daemon
2013-05-27 4:05 ` bugzilla-daemon
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