https://bugs.freedesktop.org/show_bug.cgi?id=102646
--- Comment #31 from Timothy Pearson <tpear...@raptorengineering.com> ---
(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.
--
You are receiving this mail because:
You are the assignee for the bug.
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
