scaling_max_freq = scaling_min_freq

MarcusMoeller · 10-26-2007, 01:08 PM

Hi all.

On my machine (Lifebook E8310) the cpu scaling does not really work. Directly after bootup of the machine scaling_max_freq is set correctly to the maximum value but then falls back to the minimum value and does not raise again.

Here is the (German) output of cpufreq-info:

Code:

analysiere CPU 0:
  Treiber: acpi-cpufreq
  Folgende CPUs können nur gleichzeitig ihre Frequenz variieren: 0 1
  Hardwarebedingte Grenzen der Taktfrequenz: 800 MHz - 1.80 GHz
  mögliche Taktfrequenzen: 1.80 GHz, 1.80 GHz, 1.20 GHz, 800 MHz
  mögliche Regler: userspace, conservative, powersave, ondemand, performance
  momentane Taktik: die Frequenz soll innerhalb 800 MHz und 800 MHz.
                    liegen. Der Regler "userspace" kann frei entscheiden,
                    welche Taktfrequenz innerhalb dieser Grenze verwendet wird.
  momentane Taktfrequenz ist 800 MHz  (verifiziert durch Nachfrage bei der Hardware).
analysiere CPU 1:
  Treiber: acpi-cpufreq
  Folgende CPUs können nur gleichzeitig ihre Frequenz variieren: 0 1
  Hardwarebedingte Grenzen der Taktfrequenz: 800 MHz - 1.80 GHz
  mögliche Taktfrequenzen: 1.80 GHz, 1.80 GHz, 1.20 GHz, 800 MHz
  mögliche Regler: userspace, conservative, powersave, ondemand, performance
  momentane Taktik: die Frequenz soll innerhalb 800 MHz und 800 MHz.
                    liegen. Der Regler "userspace" kann frei entscheiden,
                    welche Taktfrequenz innerhalb dieser Grenze verwendet wird.
  momentane Taktfrequenz ist 800 MHz  (verifiziert durch Nachfrage bei der Hardware).

As you may notice the max_* and min_freq are the same so scaling will never happen.

I have already installed the latest BIOS version.

Best Regards
Marcus

144419855310001 · 10-30-2007, 06:45 AM

Have you tried upgrading to the latest kernel? (are you using feisty or gutsy?)

If you're using feisty, you could try installing the gutsy kernel on your machine, which seemed to fix some of the problems I was having with cpu scaling (not anywhere as severe as yours though).

There's a good howto here, and it seems to have worked for lots of people:

http://ubuntuforums.org/showthread.p...rnel+on+feisty

Alternatively, it could be a problem with the powernow daemon which controls cpu scaling. You could try installing an alternative cpu scaling daemon and see if that does anything for you:

http://ubuntuguide.org/wiki/Ubuntu:F...aling_features