New: acpi_cpufreq can't change CPU clock anymore
https://bugzilla.kernel.org/show_bug.cgi?id=48721
Summary: acpi_cpufreq can't change CPU clock anymore
Product: Power Management
Version: 2.5
Kernel Version: 3.6.1
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: Yes
Created an attachment (id=83121)
--> (https://bugzilla.kernel.org/attachment.cgi?id=83121)
3.5.5 kernel: output of 'grep -r . /sys/devices/system/cpu/ 2>/dev/null'
On my laptop (a Clevo W150HRM with an i7 2720QM CPU) I'm currently running Debian wheezy/sid with latest aptosid (3.6-1.slh.3) amd64 kernel: after switching from 3.5.5 to 3.6 kernel I noticed the idle temperatures suddenly increased by ~10°C with no apparent activity on the system.
The temperature increase, together with sysfs scaling_cur_freq and cpuinfo_cur_freq values seem to support my suspect of a cpufreq bug: the ondemand governor doesn't seem able to modulate the CPU clock anymore. While the scaling_cur_freq value varies depending on system load just as expected, the cpuinfo_cur_freq value remains stuck at (or over because of turbo boost) the maximum CPU frequency, just like the performance governor was set.
I could get the same frequency readings with cpufreq-info, turbostat and i7z:
the CPU frequency never decreases under 2.2GHz.
Furthermore, no cpufreq-set setting seems able to lower the idle frequency in any way, even by changing governor, and a test 3.6.1 vanilla kernel I compiled for testing purposes showed the same behavior.
As soon as I reboot to a 3.5.5 kernel cpuinfo_cur_freq begin to follow scaling_cur_freq just as expected, and the idle temps decrease back by over 10°C.
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[Bug 48721] acpi_cpufreq can't change CPU clock anymore
https://bugzilla.kernel.org/show_bug.cgi?id=48721
--- Comment #1 from Maurizio Avogadro <[email protected]> 2012-10-13 01:57:21 --- Created an attachment (id=83131)
--> (https://bugzilla.kernel.org/attachment.cgi?id=83131)
3.6.1 kernel: output of 'grep -r . /sys/devices/system/cpu/ 2>/dev/null'
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[Bug 48721] acpi_cpufreq can't change CPU clock anymore
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=48721
Maurizio Avogadro <[email protected]> changed:
What |Removed |Added
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Attachment #83121|application/octet-stream |text/plain
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[Bug 48721] acpi_cpufreq can't change CPU clock anymore
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=48721
Maurizio Avogadro <[email protected]> changed:
What |Removed |Added
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Attachment #83131|application/octet-stream |text/plain
mime type| |Signature · 3 lines
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[Bug 48721] acpi_cpufreq can't change CPU clock anymore
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=48721
Maurizio Avogadro <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Kernel Version|3.6.1 |3.6.0+
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[Bug 48721] acpi_cpufreq can't change CPU clock anymore
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=48721
--- Comment #2 from Maurizio Avogadro <[email protected]> 2012-10-13 02:29:44 --- Created an attachment (id=83151)
--> (https://bugzilla.kernel.org/attachment.cgi?id=83151)
3.6.1 kernel config
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[Bug 48721] acpi_cpufreq can't change CPU clock anymore
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=48721
onorua <[email protected]> changed:
What |Removed |Added
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CC| |[email protected]
--- Comment #3 from onorua <[email protected]> 2012-10-13 07:17:29 --- I confirm the same bahavior on 3.6.2 as well.
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[Bug 48721] acpi_cpufreq can't change CPU clock anymore
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=48721
Alan <[email protected]> changed:
What |Removed |Added
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CC| |[email protected] Component|cpufreq |Power-Processor AssignedTo|[email protected] |acpi_power-processor@kernel | |-bugs.osdl.org Product|Power Management |ACPI
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