Comment 187 for bug 22336

For me - but my laptop has never overheated - just turning off powernowd lowered system temperature by 7-8 degree celcius (from 61 to 53 degrees idle - CPU T5500 still using "ondemand" frequency scaling governor). With powernowd system almost all the time ran on full speed, even if the CPU's weren't loaded with anything serious, thus ondemand governor was noot functioning properly - or rather powernowd broken it. Removing powernowd from init scripts fixes that problem, and CPU usually for text editing or web browsing are running on 60% of nominal frequency - so maybe bad powernowd influence on scaling governors causes overheating?

Note - despite proper DSDT my T5500 has somewhat limited throttling capabilities:
$ cat /proc/acpi/processor/CPU1/info
processor id: 0
acpi id: 1
bus mastering control: no
power management: yes
throttling control: no
limit interface: no
Stock ubuntu Fiesty with updated kerne & everything else: Linux black 2.6.20-16-generic #2 SMP Thu Jun 7 20:19:32 UTC 2007 i686 GNU/Linux