radeon ati power saving

[sebastian3310]

Hi everybody,
i've just passed to Ubuntu 12.10. I had windows 7 before. The problem is that now the pc is overheating and this is because of the GPU. On windows i could switch to "power saving" GPU but now i CANT. I've read that the solution is executing this 2 lines:
echo profile > /sys/class/drm/card0/device/power_method
echo low > /sys/class/drm/card0/device/power_profile

but i got: "Not such file or directory" because this files dont exist on the file system. Anybody has tha same problem or know the answer? THANKS A LOT