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Linux - Laptop and Netbook Having a problem installing or configuring Linux on your laptop? Need help running Linux on your netbook? This forum is for you. This forum is for any topics relating to Linux and either traditional laptops or netbooks (such as the Asus EEE PC, Everex CloudBook or MSI Wind).

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Old 04-23-2006, 07:07 PM   #1
xpromisex
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Registered: Apr 2004
Location: Statesboro, GA
Distribution: Arch Linux 2007.05 "Duke" (Kernel 2.6.21)
Posts: 447

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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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