https://bugzilla.kernel.org/show_bug.cgi?id=202445
--- Comment #13 from Clément Guérin (libcg@protonmail.com) --- YouTube refuses to show the vertical video as 1080p so I made another one here, this time horizontal: https://www.youtube.com/watch?v=CTKr4NWXXKI
Also for reference, here's Unigine Valley running on Windows with no flickering and smooth LFC: https://www.youtube.com/watch?v=4mYbZ7leVPw Framerate on the monitor OSD is much more consistent.