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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 04-22-2007, 12:23 AM   #1
solotrekker
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Thumbs up Centrino CPU Frequency Scaling


Hi all,

I have Centrino 1.6GHz on a Thinkpad R51. When running with Windows, the frequency can reach the lowest point @ 221MHz, and the fan barely spins.

How can I reach the same frequency with OpenSuSE 10.2? I tried the YaST powersave module. But the lowest frequency could only down to 600MHz.

Many thanks!
 
Old 04-26-2007, 07:25 PM   #2
hollywoodb
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To see what frequencies are available:
Code:
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
My Centrino 1.8GHz also goes as low as 600MHz, no lower. May be a limitation in the cpufreq code. When I tried FreeBSD, after a lot of fuss I got it down to 200MHz, which was nearly unusable.

I'm not sure that you can go lower, but you can edit the values in the files in /sys/devices/system/cpu/cpu0/cpufreq/ (be careful)
 
Old 04-27-2007, 10:49 PM   #3
solotrekker
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Question

Hi,

I tried to edit the files 'cpuinfo_min_freq' and 'scaling_min_freq' under /sys/devices/system/cpu/cpu0/cpufreq with echo command:

Code:
echo 300000 > cpuinfo_min_freq
and

Code:
echo 300000 > scaling_min_freq
But it seems doesn't work. The 'cat' replies the value remains at 600000.

How could I edit those two files?
 
Old 04-28-2007, 11:49 AM   #4
hollywoodb
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You probably just can't. It might be part of the cpufreq code.

cpufreq has its own mailing list you could try, they'd definitely be the most knowledgeable:

http://www.kernel.org/pub/linux/util...q/cpufreq.html
 
Old 04-30-2007, 05:28 PM   #5
solotrekker
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Howdy,

Thanks for your reply and the link you gave to me!

You are right.I think the lowest frequency on this chip is 600MHz. Yesterday I put on NHC in Windows. The report showed the lowest frequency was 600, no less. But the funny part was that when I went to the "Properties" from "My Computer", the Windows showed me 221MHz only, which was less than half of the real frequency. duno why...


Last edited by solotrekker; 04-30-2007 at 05:31 PM.
 
  


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