After googling and searching various forums for help didn't solve my problem, I now post here:

I'm running Kubuntu 12.04.01, Kernel 3.2, and using a Radeon 6970 (Cayman chip). Using two monitors side by side. The open source driver that comes with Ubuntu 12.04.01 is used. No xorg.conf exists.

I tried to set power save as per: via:

echo profile > /sys/class/drm/card0/device/power_method
echo low > /sys/class/drm/card0/device/power_profile
cat /sys/kernel/debug/dri/0/radeon_pm_info
shows no change wether I set low, mid, high or auto profile. Using dynpm as power_method has no effect either.

Any ideas what might cause this and how to proceed?

Thanks and best regards