https://bugzilla.kernel.org/show_bug.cgi?id=201067
--- Comment #10 from Benjamin Xiao (ben.r.xiao@gmail.com) --- (In reply to Nicholas Kazlauskas from comment #3)
Created attachment 278455 [details] 0001-drm-amd-display-Use-higher-dispclk-value-for-dce120.patch
Do you mind testing another patch?
This patch has a narrower impact than the previous one (since it should only target Vega). I imagine that it would also fix your issue but it'd be nice to have verification.
Will this patch be backported to 4.19? Seems like right now its only in 4.20.