Modify Thermal trip points, modern kernel acpi /sys/class/thermal/thermal_zone0/
Hi on my laptop (ASUS EeePC 1215b) an AMD E-450 based system the current
open source drivers in Wheezy don't manage power very well so the system
overheats & the battery doesn't last long. 
I've got squeeze running quite nicely with kernel, fglrx & their
dependencies coming from backports, but even then if you tax both cores
the CPU temperature climes quite quickly.
What I'd like to do is lower the temperature at which active cooling starts
Battery 0: Unknown, 99%
Battery 0: design capacity 5200 mAh, last full capacity 5360 mAh = 100%
Adapter 0: on-line
Thermal 0: ok, 75.0 degrees C
Thermal 0: trip point 0 switches to mode critical at temperature 95.0 degrees C
Thermal 0: trip point 1 switches to mode passive at temperature 120.0 degrees C
Cooling 0: LCD 0 of 10
Cooling 1: Processor 0 of 10
Cooling 2: Processor 0 of 10
is "mode critical" the temperature above which the fan starts or at
which the system shuts down? Also shouldn't "mode passive" be around 50
assuming it's the temperature below which the fan turns off to rely on
How do I modify these numbers now the /proc/acpi thermal stuff is
Thanks for any help.
 thinks are much better if you do
echo dynpm > /sys/class/drm/card0/device/power_method
echo low > /sys/class/drm/card0/device/power_profile
mount -t debugfs none /sys/kernel/debug
tell you about GPU clock speed etc, I also had
Option "ClockGating" "TRUE"
Option "ForceLowPowerMode" "FALSE"
Option "DynamicPM" "TRUE"
in my xorg.conf but I haven't yet tested which of those has the most impact.