[Bugme-new] [Bug 17001] New: ondemand governor non-functional / ACPI P-states driver
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Wed Aug 25 04:52:11 PDT 2010
https://bugzilla.kernel.org/show_bug.cgi?id=17001
Summary: ondemand governor non-functional / ACPI P-states
driver
Product: Power Management
Version: 2.5
Kernel Version: 2.6.35.3
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
AssignedTo: cpufreq at vger.kernel.org
ReportedBy: peter.ganzhorn at googlemail.com
Regression: No
Hardware:
Toshiba Tecra A9 notebook
Intel Core2 Duo T7300 2.0 GHz processor
Software:
Debian testing "Squeeze"
Kernel 2.6.35.3
Bug description:
With the cpufreq-ondemand governor enabled, the CPU frequency does not increase
at all with any workload.
Even with both cores running at 100% load the CPU frequency will never increase
above the minimum frequency of 800MHz.
Using the performance governor makes the CPU switch to 2GHz immediately.
Running on battery or AC power does not have any effect on this issue.
I am using the exact same software configuration (same distro, kernel .config
is identical except for different NIC drivers) on a workstation computer with
an Intel Core2 Quad Q9550, the workstation is not affected by the issue (CPU
frequency is changed when load situation changes almost instantaneously to a
frequency fitting the current load situation).
Here's some sysfs info about the cpufreq configuration (looks fine to me):
centauri:/sys/devices/system/cpu/cpu0/cpufreq# cat ./cpuinfo_max_freq
2001000
centauri:/sys/devices/system/cpu/cpu0/cpufreq# cat ./cpuinfo_min_freq
800000
centauri:/sys/devices/system/cpu/cpu0/cpufreq# cat ./scaling_max_freq
2001000
centauri:/sys/devices/system/cpu/cpu0/cpufreq# cat ./scaling_min_freq
800000
centauri:/sys/devices/system/cpu/cpu0/cpufreq# cat ./scaling_setspeed
<unsupported>
centauri:/sys/devices/system/cpu/cpu0/cpufreq# cat ./scaling_governor
performance
centauri:/sys/devices/system/cpu/cpu0/cpufreq# cat ./scaling_driver
acpi-cpufreq
centauri:/sys/devices/system/cpu/cpu0/cpufreq# cat
./scaling_available_frequencies
2001000 2000000 1600000 1200000 800000
Please tell me what other information I need to submit to you.
As far as I can tell, the problem exists at least since kernel version 2.6.30,
I did not test any earlier versions.
Debian distribution stock kernel is affected from the issue as well.
Thanks for looking into this issue.
best regards,
Peter Ganzhorn
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