Ubuntu
linux package

  1. Bug #365798
  2. Comment #35

Comment 35 for bug 365798

Revision history for this message
the-fallen (thefallen) wrote :

During my work with linux-phc I noticed that some combinations of Intel Pentium M (centrino based) CPUs and BIOSes fail to work using acpi-cpufreq but working with speedstep-centrino.

The problem is somewhere within the ACPI subsystem that decides that the system lacks some needed functionality (-> SYSTEM_IO_CAPABLE instead of SYSTEM_MSR_CAPABLE).

Until 8.10 the speedstep-centrino did the work. Not that the Ubuntu devs decided to compile-in processor drivers speedstep-centrino can not work (because acpi-cpufreq blocks the device since it took over the functions).

The only way to those certain users will be to compile their own kernel and set acpi-cpufreq as module again (or completely remove it) to be able to use speedstep-centrino again.