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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 11-02-2005, 07:23 PM   #1
Ravendark
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Registered: Feb 2003
Distribution: Slackware 10.2
Posts: 61

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Amilo A1650 frequency scaling


Hi,
I have a Fujitsu-Siemens Amilo A1650 with athlon-64 3400+.
I run on it slackware 10.2 (which is working great!) and winblowzXP. I only use windows for internet because I cant make my wireless card work on slack.

I have a question. I have noticed that the cpu is changing speeds in windows (800MHz, 1.6GHz and 2.2GHz).
But in slack every time i check cpuinfo (from /proc) it says that the speed of the cpu is 800MHZno matter the cpu utilization at that time.

Why?
Thanks in advance.

Last edited by Ravendark; 11-02-2005 at 07:25 PM.
 
Old 11-04-2005, 02:48 AM   #2
basileus
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Registered: Nov 2004
Location: Turku, Finland
Distribution: Debian, Ubuntu, Gentoo
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I have never used AMD 64 processors, but I suppose Cpu Frequency Scaling should work on it like on any other CPU.

Make sure you have kernel support for CFS enabled. Note that 2.4 kernels do not include support for it.

find /lib/modules/yourkernelversion -name "cpufreq_userspace.ko"

If this module is found, then all should be ok. Next make sure you have appropriate CFS daemon installed. I prefer "powernowd", because it is the simplest. There are others which you can try, for example "cpudynd" and "cpufreqd", but they are not as simple.

Also check you BIOS settings. Some laptops have defaults options for the CPU frequency. Even if you can't make real Linux CFS to work, you might be able to set the default to 2.2Ghz from BIOS. When you need long battery life, you could switch that default to 800Mhz temporarily.
 
  


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