* - Tong - mlist4suntong@yahoo.com [20070731 03:15]:
I rebooted my PC the other day, and only then I know that my CPU is overheated, because I saw a BIOS warning. The fact that my CPU might have been overheated for months made me consider seriously to control my CPU frequency (My AMD cpu has that feature available in bios).
What temperature was your CPU running at?
I've tried to make use powernowd before, but never able to. I should feel lucky this time since the latest kernel that grml 1.0-1 uses, support cpu frequency control by default:
http://kernelnewbies.org/Linux_2_6_20 "Grand unification of ACPI based speedstep-centrino and acpi-cpufreq drivers. It combines functionality of these two driver into acpi-cpufreq driver."
But the problem is that googling "acpi-cpufreq" didn't come up much result. The closest is from http://bbs.archlinux.org/viewtopic.php?pid=256607
"... you should try the 'acpi-cpufreq' module. My favorite governor is the 'conservative' one. Under load, it will ramp up the frequency, but it will generally keep it as low as possible."
But there is no details. So I'm wondering if anyone can help me here?
acpi-cpufreq is the kernel module used instead of speedstep-centrino with kernels >=2.6.20.
To check your current settings regarding cpu frequency scaling check output of 'cpufreq-info'. To configure your current settings (if you aren't happy with the defaults) either manually use sysfs or use the userspace tool cpufreq-set.
Is the 'thermal' kernel module loaded on your system? Check CPU temperature using tools like sensors/mbmon (depending of your hardware whether what's supported of course).
If you want to read some docs regarding ACPI and cpufreq start for example with https://www.linux-magazine.com/issue/40/ACPI.pdf and https://ols2006.108.redhat.com/2007/Reprints/brown_1-Reprint.pdf and the docs inside Documentation/cpu-freq/ of current kernel sources.
regards, -mika-