Power management seems not to work at all on HD7480D. I tried to change power profile to "mid" or "low", but nothing happend. I'm using openSUSE 12.3 which has version 7.0.0 of radeon driver. Should power management work with Northern Islands?
As of Kernel 3.9-rc6 power management is not yet supported for Trinity. (ARUBA is the code name for the integrated graphics and TN stands for Trinity, the code name of your A4-5300.) If you use KMS (Kernel Mode Setting; default since 7.0.0) then power management is done by the kernel. Watch the file linked below for changes in this regard. https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/radeon/radeon_pm.c?id=refs/tags/v3.9-rc6#n495
The recent updates by AMD [1] destined for Linux 3.11 include power management support for Trinity. Once the kernel with these patches is released, add the option radeon.dpm=1 to your kernel command line to active dynamic power management. [1] http://lists.freedesktop.org/archives/dri-devel/2013-June/040436.html
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