* [Bug 48721] New: acpi_cpufreq can't change CPU clock anymore
@ 2012-10-13 1:56 bugzilla-daemon
2012-10-13 1:57 ` [Bug 48721] " bugzilla-daemon
` (6 more replies)
0 siblings, 7 replies; 8+ messages in thread
From: bugzilla-daemon @ 2012-10-13 1:56 UTC (permalink / raw)
To: cpufreq
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: cpufreq@vger.kernel.org
ReportedBy: mavoga@gmail.com
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
2012-10-13 1:56 [Bug 48721] New: acpi_cpufreq can't change CPU clock anymore bugzilla-daemon
@ 2012-10-13 1:57 ` bugzilla-daemon
2012-10-13 2:03 ` bugzilla-daemon
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: bugzilla-daemon @ 2012-10-13 1:57 UTC (permalink / raw)
To: cpufreq
https://bugzilla.kernel.org/show_bug.cgi?id=48721
--- Comment #1 from Maurizio Avogadro <mavoga@gmail.com> 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
2012-10-13 1:56 [Bug 48721] New: acpi_cpufreq can't change CPU clock anymore bugzilla-daemon
2012-10-13 1:57 ` [Bug 48721] " bugzilla-daemon
@ 2012-10-13 2:03 ` bugzilla-daemon
2012-10-13 2:03 ` bugzilla-daemon
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: bugzilla-daemon @ 2012-10-13 2:03 UTC (permalink / raw)
To: cpufreq
https://bugzilla.kernel.org/show_bug.cgi?id=48721
Maurizio Avogadro <mavoga@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #83121|application/octet-stream |text/plain
mime type| |
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* [Bug 48721] acpi_cpufreq can't change CPU clock anymore
2012-10-13 1:56 [Bug 48721] New: acpi_cpufreq can't change CPU clock anymore bugzilla-daemon
2012-10-13 1:57 ` [Bug 48721] " bugzilla-daemon
2012-10-13 2:03 ` bugzilla-daemon
@ 2012-10-13 2:03 ` bugzilla-daemon
2012-10-13 2:08 ` bugzilla-daemon
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: bugzilla-daemon @ 2012-10-13 2:03 UTC (permalink / raw)
To: cpufreq
https://bugzilla.kernel.org/show_bug.cgi?id=48721
Maurizio Avogadro <mavoga@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #83131|application/octet-stream |text/plain
mime type| |
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* [Bug 48721] acpi_cpufreq can't change CPU clock anymore
2012-10-13 1:56 [Bug 48721] New: acpi_cpufreq can't change CPU clock anymore bugzilla-daemon
` (2 preceding siblings ...)
2012-10-13 2:03 ` bugzilla-daemon
@ 2012-10-13 2:08 ` bugzilla-daemon
2012-10-13 2:29 ` bugzilla-daemon
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: bugzilla-daemon @ 2012-10-13 2:08 UTC (permalink / raw)
To: cpufreq
https://bugzilla.kernel.org/show_bug.cgi?id=48721
Maurizio Avogadro <mavoga@gmail.com> 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
2012-10-13 1:56 [Bug 48721] New: acpi_cpufreq can't change CPU clock anymore bugzilla-daemon
` (3 preceding siblings ...)
2012-10-13 2:08 ` bugzilla-daemon
@ 2012-10-13 2:29 ` bugzilla-daemon
2012-10-13 7:17 ` bugzilla-daemon
2012-10-14 12:12 ` bugzilla-daemon
6 siblings, 0 replies; 8+ messages in thread
From: bugzilla-daemon @ 2012-10-13 2:29 UTC (permalink / raw)
To: cpufreq
https://bugzilla.kernel.org/show_bug.cgi?id=48721
--- Comment #2 from Maurizio Avogadro <mavoga@gmail.com> 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
2012-10-13 1:56 [Bug 48721] New: acpi_cpufreq can't change CPU clock anymore bugzilla-daemon
` (4 preceding siblings ...)
2012-10-13 2:29 ` bugzilla-daemon
@ 2012-10-13 7:17 ` bugzilla-daemon
2012-10-14 12:12 ` bugzilla-daemon
6 siblings, 0 replies; 8+ messages in thread
From: bugzilla-daemon @ 2012-10-13 7:17 UTC (permalink / raw)
To: cpufreq
https://bugzilla.kernel.org/show_bug.cgi?id=48721
onorua <onorua@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |onorua@gmail.com
--- Comment #3 from onorua <onorua@gmail.com> 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
2012-10-13 1:56 [Bug 48721] New: acpi_cpufreq can't change CPU clock anymore bugzilla-daemon
` (5 preceding siblings ...)
2012-10-13 7:17 ` bugzilla-daemon
@ 2012-10-14 12:12 ` bugzilla-daemon
6 siblings, 0 replies; 8+ messages in thread
From: bugzilla-daemon @ 2012-10-14 12:12 UTC (permalink / raw)
To: cpufreq
https://bugzilla.kernel.org/show_bug.cgi?id=48721
Alan <alan@lxorguk.ukuu.org.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |alan@lxorguk.ukuu.org.uk
Component|cpufreq |Power-Processor
AssignedTo|cpufreq@vger.kernel.org |acpi_power-processor@kernel
| |-bugs.osdl.org
Product|Power Management |ACPI
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