Ubuntu
linux-source-2.6.22 package

  1. Bug #120759
  2. Comment #14

Comment 14 for bug 120759

Revision history for this message
Ivan N. Veselov (veselov-gmail) wrote :

Hi all!

I experienced pretty much the same troubles earlier: my PentiumM 750 1.86GHz was stuck on 800 Mhz and acpi-cpufreq was not able to change frequency in spite of the fact speedstep was enabled in BIOS, but speedstep_centrino module couldn't be loaded due to "No such device" error.
It seemed that BIOS hadn't report valid CPU frequencies correctly or I had had some another issues with ACPI system.

So here is the speedstep-centrino.c patch which is based on linux-phc-0.2.10 and adopted to vanilla 2.6.24 kernel by one friend of mine.
It doesn't use ACPI info in its work, so it can fix the problem with broken ACPI or BIOS functionality. Moreover, it might be useful when you are not able to change speedstep settings from BIOS but want to use speedestep anyway.

Patch also adds some new options to the kernel, which needs to be answered 'Y'.

I hope this might be useful for fixing similar problems.

WBR,
Ivan N. Veselov.