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-   -   Kernel Upgrade seems to have killed cpu frequency scaling on a Pentium M Laptop (http://www.linuxquestions.org/questions/linux-laptop-and-netbook-25/kernel-upgrade-seems-to-have-killed-cpu-frequency-scaling-on-a-pentium-m-laptop-438154/)

xpromisex 04-23-2006 07:07 PM

Kernel Upgrade seems to have killed cpu frequency scaling on a Pentium M Laptop
 
Okay - I'm using Arch Linux (0.7.1 with the newest available 2.6.16 kernel in the official repos) on a Sony Vaio PCG-GRT390ZP. Before upgrading to the 2.6.16 kernel, I was using powernowd to throttle my cpu. Worked rather well, scaling the processor from 2.8 GHz all the way back to 349 MHz. However, recently (presumably after the kernel / udev update I did about three days ago) the scaling is showing the incorrect number of scaling steps - I used to have 8 of them, I now only have 3 (2.1 GHz, 2.45 GHz, and 2.8 GHz) It seems to me that the clients are ignoring the bottom register of the scaling ladder, so to speak.

I found this weird and went to check the cpufreq_min_freq in /sys, but the min frequency is listed at 2099947 (2.10 GHz). I know for a fact that the min freq should be at 349 MHz. I have tried changing the governors, echoing the correct value into the file as root with:

Code:

#echo "349991" > cpuinfo_min_freq
and even changing permissions so that the above action MAY work (when I found that root didn't even have write permissions on the file in question)

Anyone have any suggestions? Im at my wit's end.

if it helps anyone, here is a link to a similar problem, but with no apparent solution.



Thank you guys for your time.


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