[Lenovo ThinkCentre M55] CPU scaled back to very slow speed, cannot increase speed
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Incomplete
|
Medium
|
|||
linux (Ubuntu) |
Incomplete
|
Medium
|
Unassigned |
Bug Description
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-
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 <email address hidden>, 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.
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.
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/
/sys/devices/
0
/sys/devices/
700000
/sys/devices/
700000
/sys/devices/
700000
/sys/devices/
600000
/sys/devices/
10000
/sys/devices/
0 1
/sys/devices/
700000 600000
/sys/devices/
conservative ondemand userspace powersave performance
/sys/devices/
700000
/sys/devices/
acpi-cpufreq
/sys/devices/
ondemand
/sys/devices/
700000
/sys/devices/
600000
/sys/devices/
<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-
ProcVersionSign
Uname: Linux 3.2.0-20-generic x86_64
NonfreeKernelMo
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Fri Mar 23 09:59:01 2012
HibernationDevice: RESUME=
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100701)
MachineType: LENOVO 881091G
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=
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.
dmi.chassis.type: 3
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.name: 881091G
dmi.product.
dmi.sys.vendor: LENOVO
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
Changed in linux (Ubuntu): | |
status: | Incomplete → New |
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Confirmed |
Changed in linux: | |
status: | Confirmed → Incomplete |
Changed in linux: | |
status: | Incomplete → In Progress |
Changed in linux: | |
status: | In Progress → Incomplete |
tags: | added: latest-bios-2jkt49aus |
tags: | added: needs-upstream-testing |
tags: | added: regression-potential |
tags: |
added: regression-release removed: regression-potential |
tags: | added: saucy |
summary: |
- CPU scaled back to very slow speed, cannot increase speed + [Lenovo ThinkCentre M55] CPU scaled back to very slow speed, cannot + increase speed |
This seems to be an issue with the devfreq governors.
If you could also please test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https:/ /wiki.ubuntu. com/KernelMainl ineBuilds . Once you've tested the upstream kernel, please remove the 'needs- upstream- testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs- upstream- testing' text. Please let us know your results.
Thanks in advance.