https://bugs.freedesktop.org/show_bug.cgi?id=66963
--- Comment #11 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #10)
Tried last 4 patches from Alex. Didn't work for me. The issue remains.
Does disabling mclk switching help?
comment out:
r600_enable_mclk_control(rdev, true);
in r600_start_dpm()