I have a Thinkpad W500 with a dual Intel/ATI GPU combo. This laptop has a pretty accurate thermal sensor for the Radeon GPU that can be read with gkrellm. Since the sensor only reports a temperature if the Radeon GPU is activated in the BIOS, I feel confident it reports the right readings.
Usually the temperature for the Radeon GPU idles around 67-70 degrees C and compared to when only the Intel GPU is active, this GPU has a tendency to bump the main CPU temperature up as well, to about 58-60 or so degrees C.
I just installed kernel-2.6.34-43.fc14 which according to the list of patches has had a lot of radeon power management work. I added:
and did this to switch to the low power usage profile after boot:
echo low > /sys/class/drm/card0/device/power_profile
Now, about 15 minutes later and in the same room and ambient temperature, gkrellm reports:
I can still play videos just fine, although glxgears drops from about 1350fps to 300fps and moving around opaque windows in Fluxbox has a funny slow feel to it (which can easily be worked around by toggle that feature off in Flux).
Great to see some drastic improvement on the pm side of things!
I have a question though, can I activate the 'low' profile already on the grub kernel line?
EDIT: I should add that the CPU/GPU fan is still spinning at about 3000 rpms at this temperature. I had hopes that it would spontaneously switch to a less noisy state at those temps.