https://bugs.freedesktop.org/show_bug.cgi?id=96868

--- Comment #11 from sonyp2p@gmail.com --- (In reply to Alex Deucher from comment #4)

Does forcing the clocks to high or low fix the issue? (as root): echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level or echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level

I did this test and I can confirm that if I set power_dpm_force_performance_level to high or log the flickering stops. So at 144Hz with power_dpm_force_performance_level set to auto there is flickering. With power_dpm_force_performance_level set to high or low this bug is not present.