Comment # 10
on bug 87796
from Alex Deucher
It looks like maybe the dpm memory reclocking occasionally misses the vblank. Do you still get the glitches if you connect a secondary display or disable dynamic clocking? To disable able dynamic clocking (as root): echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level to re-enable it (as root): echo auto > /sys/class/drm/card0/device/power_dpm_force_performance_level
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