pluging ac adaptater don't maximize frequency

Help
kregory
2006-03-23
2013-04-08
  • kregory
    kregory
    2006-03-23

    Hi,

    When I remove the AC adaptater the cpu throtle to 800MHz, but when I re plugged it, the CPU frequency don't go to is max ( 1800 MHz )

    Is someone can help me ?

    ( sorry for my poor english ... )

    Big thanx

     
    • Danny Al-Gaaf
      Danny Al-Gaaf
      2006-03-23

      By default (k)powersave use dynamic CPU frequency scaling. Because of this the CPUfreq does not go to maximum on AC, it go only to max if needed. But you can set the CPU frequency to max if you use kpowersave and choose 'Performance' under 'Set CPU Frequency Policy'.

       
      • kregory
        kregory
        2006-03-23

        ok,
        but even when I set the policy to "performance" the CPU frequency is'nt set to max...

        See what happen in command line :
        kreg:/home/kreg # cpufreq-info -d
        centrino
        kreg:/home/kreg # cpufreq-info -p
        800000 800000 userspace
        kreg:/home/kreg # cpufreq-info -l
        800000 1867000
        kreg:/home/kreg # cpufreq-set -f 1867000
        kreg:/home/kreg # cpufreq-info -w -m
        800 MHz

        I don't understand why cpufreq-set doesn't work ... ( I do this under root user )

         
        • Danny Al-Gaaf
          Danny Al-Gaaf
          2006-03-25

          Can you say more about the machine? What kind of laptop is this? Which distribution?

           
    • kregory
      kregory
      2006-03-26

      yes ...
      it's a a dell laptop ( inspiron 9300 ) with a suse 10.0

       
      • Danny Al-Gaaf
        Danny Al-Gaaf
        2006-03-27

        Hm ... sound to me like a already known kerne bug. Take a look at: https://bugzilla.novell.com/show_bug.cgi?id=119836 . We had this problem currently only on DELL D600 and some other machine, but maybe your Inspiron is also effected.

        Our ACPI/Kernel ppl are currently working on this problem.

         
    • kregory
      kregory
      2006-03-26

      sorry...
      and the proc is an intel centrino 1.87Ghz who can throttle to 800Mhz