Public bug reported:
It appears that my 1.86GHz Intel Core2 CPU is only running at 700Mhz.
The attached files show (in /proc/cpu) that the cpu is actually a
1.86Ghz, but cpufreq only lets me set a maximum of 700mhz. I am running
precise amd64 on a 3.2.0-20-generic kernel, though the same was seen
linux-image-3.2.0-19-generic as well I believe.
The system is a Lenovo ThinkCentre 8810-91G, and the bios is the latest
one available. The bios doesn't show any cpu limiting options or
restrictions, and shows the cpus as the expected 1.86Mhz (though I think
that is just model information rather than the current clock speed). I
cannot see any overclocking options in the bios.
$cpufreq-info
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpuf...@vger.kernel.org, please.
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 600 MHz - 700 MHz
available frequency steps: 700 MHz, 600 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 600 MHz and 700 MHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 600 MHz.
cpufreq stats: 700 MHz:69.61%, 600 MHz:30.39% (3179)
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 10.0 us.
hardware limits: 600 MHz - 700 MHz
available frequency steps: 700 MHz, 600 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 600 MHz and 700 MHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 700 MHz.
cpufreq stats: 700 MHz:59.66%, 600 MHz:40.34% (4168)
ACPI appears to be reporting a bios limit on the CPU, though I have no
idea why.
$for i in /sys/devices/system/cpu/cpu0/cpufreq/*; do echo $i; sudo cat $i ; done
/sys/devices/system/cpu/cpu0/cpufreq/affected_cpus
0
/sys/devices/system/cpu/cpu0/cpufreq/bios_limit
700000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
700000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
700000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
600000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency
10000
/sys/devices/system/cpu/cpu0/cpufreq/related_cpus
0 1
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
700000 600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
conservative ondemand userspace powersave performance
/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
700000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
acpi-cpufreq
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ondemand
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
700000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
<unsupported>
I can't recall if this was an issue on oneiric or not as I never looked
at the cpufreq before. It may or may not be a new issue.
I'm not entirely sure if this is a kernel bug or something else (like
ACPI), but am happy to try various other kernels to see if they help.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-20-generic 3.2.0-20.32
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: anton 4977 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not
found.
Date: Fri Mar 23 09:59:01 2012
HibernationDevice: RESUME=/dev/mapper/vg0-swap
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100701)
MachineType: LENOVO 881091G
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-20-generic
root=/dev/mapper/vg0-ubuntu ro quiet splash vt.handoff=7
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/12/2008
dmi.bios.vendor: LENOVO
dmi.bios.version: 2JKT49AUS
dmi.board.name: LENOVO
dmi.board.vendor: LENOVO
dmi.board.version: NONE
dmi.chassis.asset.tag: �������������������������
dmi.chassis.type: 3
dmi.chassis.vendor: LENOVO
dmi.chassis.version: NONE
dmi.modalias:
dmi:bvnLENOVO:bvr2JKT49AUS:bd12/12/2008:svnLENOVO:pn881091G:pvrThinkCentreM55:rvnLENOVO:rnLENOVO:rvrNONE:cvnLENOVO:ct3:cvrNONE:
dmi.product.name: 881091G
dmi.product.version: ThinkCentre M55
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise
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https://bugs.launchpad.net/bugs/962947
Title:
CPU scaled back to very slow speed, cannot increase speed
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