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how to change CPU freq by hands
  • bondwishbondwish January 2011
    I run the latest cooking of Slitaz on IBM T42, which I found out the CPU freq is set at 600MHz. I want to speed up the CPU, so I install the CPU freq untils, but found out the cpufreq utils can't find the right driver of CPU, it said:no or unknown cpufreq driver is active on this CPU.

    How can I set the CPU freq by hands?
    Thanks.
  • kultexkultex January 2011
    http://forum.slitaz.org/index.php?p=/discussion/2412/saving-energy/#Item_2
  • bondwishbondwish January 2011
    I have installed the cpufreq tools.  while run cpufreq-info, it shows:
      analyzing CPU 0:
      no or unknown cpufreq driver is active on this CPU
      maximum transition latency: 0.00 ms.

    that means I can't set the cpufreq since no proper driver on CPU.

    What can I do to active the cpufreq driver on CPU?

  • GokhlayehGokhlayeh January 2011
    You have to load the right cpufreq module for linux kernel, using : modprobe modulename. Actually the kernel doesn't detect the right module for you, and different modules exists for different CPU. Note that powermanagement, particulary concerning the CPU, is something in progress with linux as information about hardware caracteristics becomes available.

    archlinux wiki propose a complete howto about setting cpu scaling using cpufreq : https://wiki.archlinux.org/index.php/Cpufreq

    It includes information about what module to load and explanations about commons governors.

    Hope this help.
  • kultexkultex January 2011
    the T42 has the same CPU as my X31 - evrything ist working, when you do all steps

    http://forum.slitaz.org/index.php?p=/discussion/2412/saving-energy/#Item_2
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