Ubuntu
linux-source-2.6.22 package

  1. Bug #132271
  2. Comment #37

Comment 37 for bug 132271

Revision history for this message
samnmax (aleixmercader) wrote :

I have the same problem. After upgrading to Gutsy, speedstep doesn't work. Pentium M 725 is stuck at 1600MHz.

I tried this:

# modprobe speedstep-centrino
FATAL: Error inserting speedstep_centrino (/lib/modules/2.6.22-14-generic/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko): No such device
# modprobe acpi-cpufreq
FATAL: Error inserting acpi_cpufreq (/lib/modules/2.6.22-14-generic/kernel/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.ko): No such device

This is with the standard Gutsy kernel, 2.6.22-14. The upgrade program left the old feisty kernel (2.6.20-16), that works OK.

On WinXP or Vista it is also stuck at 1600 at a default install. I must use other programs like NHC or RMclock to change speed. So maybe ACPI is broken on this laptop (AHTEC Signal X-9600M, wich is a Quanta Z500N).

Attached dmesg. note the lines:
ACPI: Invalid _PSS data: freq is zero

I understand that it worked before because of hardcoded speed and voltage tables in speedstep-centrino, that are deprecated in the new kernel. Is there a chance to get it fixed/patched on the next kernel revision? If not I will be hearing this annoying fan forever... :)