https://bugzilla.kernel.org/show_bug.cgi?id=37112

Rafał Miłecki zajec5@gmail.com changed:

What |Removed |Added ---------------------------------------------------------------------------- CC| |zajec5@gmail.com

--- Comment #6 from Rafał Miłecki zajec5@gmail.com 2011-06-11 07:36:36 --- (In reply to comment #5)

My first guess is , that kernel changes memory clock too low - with fglrx lowest memory clock is at 400MHz , but with radeon module/low frequency it changes it to 300MHz.

Please, edit drivers/gpu/drm/radeon/radeon_pm.c, find:

if (rdev->asic->set_memory_clock && (mclk != rdev->pm.current_mclk)) {

and make it

if (0) {

Does it help?