Talk:How to make use of Dynamic Frequency Scaling
CPU Speedstep management activation
I could not find the "processor" and "acpi-cpufreq" modules, thus leading to an empty /sys/devices/system/cpu/cpu0/ and preventing to set cpu throttling. I found the speedstep-centrino module which enables the feature. Environment : X41 (Pentium M), Debian Sid with custom 2.6.12 kernel. Is the Debian part of the article outdated ? Hope this helps, Vincent
speedstep-smi for T22
I had to use the speedstep-smi driver for my T22, not the speedstep-ich driver as stated in the how-to. Thomas
Yes, it was a mistake. Thanks for the note. Wyrfel 21:49, 27 Oct 2005 (CEST)
Extremely low freq on a T22
About an hour ago I made Speedstep work on a T22 running Ubuntu Breezy (5.10). Before that I had the machine randomly boot at 700MHz or 900MHz. That is nothing special. But, earlier today, when I booted it, it was running at 187MHz, according to both /proc/cpuinfo and Gnome's CPU frequency applet. It also took about 4 times as long to do some CPU-intensive processing than usually (grepping and sorting a known amount of text), so I'm still thinking that my Thinkpad really was running at 187MHz until I rebooted it.
Has anyone else noticed anything like this? Is there a way to replicate this behavior? Is there a way to "enable" this "step"?
Yes, i brought my X20 down to similarly low frequencies also with Ubuntu. I think it's possible through ACPI throttling, but I'm not sure if that was actually how i did it.
Wyrfel 23:51, 9 Jan 2006 (CET)