https://bugzilla.kernel.org/show_bug.cgi?id=43091
Summary: core2 cpu locked to lowest cpu scaling speed
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Processors
AssignedTo: acpi_config-process...@kernel-bugs.osdl.org
ReportedBy: an...@piatek.co.uk
Regression: Yes
Originally reported against Ubuntu, more information there may be helpful but
let me know if you want anything specifically
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/962947
It appears that my 1.86GHz Intel Core2 CPU is only running at 700Mhz. Th cpu is
actually a 1.86Ghz, but cpufreq only lets me set a maximum of 700mhz.
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.
anton@smeg:~$uname -a Linux smeg.hursley.ibm.com 3.4.0-030400rc2-generic
#201204072235 SMP Sun Apr 8 02:36:11 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
anton@smeg:~$cpufreq-info cpufrequtils 007: cpufreq-info (C) Dominik Brodowski
2004-2009Report 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. The governor
"ondemand" may decide which speed to use within this range.
current CPU frequency is 600 MHz.
cpufreq stats: 700 MHz:45.14%, 600 MHz:54.86% (343)
I tried setting processor.ignore_ppc=1 on the kernel boot options, but it made
no difference.
I marked this as a regression as it used to work, but as I don't keep an eye on
cpu scaling speeds on my desktop I have no idea when it last worked at full
speed. I will try some older kernels and see if I can find one which works.
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