Comment # 31
on bug 102646
from Timothy Pearson
(In reply to L.Y. Sim from comment #30) > I have this issue on a 3840x1600 Acer XR382CQK with an RX560 with Kernel > 4.18.5-1 on Manjaro. > > When I set the refresh rate to 75Hz, severe artifacts and flickering appear. > > Both > > echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level > and > > echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level > > stop the flickering and artifacting, and I can see via > > cat /sys/class/drm/card0/device/pp_dpm_mclk > > that the memory clocks are set to 1750Mhz and 300Mhz respectively. > > However, if /sys/class/drm/card0/device/power_dpm_force_performance_level is > set to auto, I can see (via watching /sys/class/drm/card0/device/pp_dpm_mclk > with time intervals around 0.1s), that the memory clock oscillates rapidly > between 300Mhz, 625Mhz and 1750Mhz. > > So it seems to me that the rapid change in memory frequency is what's > causing the flickering. Confirmed here on a Polaris 10 GPU (WX7100) on DisplayPort with the latest kernel master from GIT (4.19+). The workaround sequence above stops the irritating flickering. dc=0 alone does /not/ stop the flickering, and dc=1 yields no displays detected due to some other bug.
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