https://bugzilla.kernel.org/show_bug.cgi?id=202445
--- Comment #38 from jaapbuurman@gmail.com --- While I previously also had to same luminance flickering as you were describing on older kernels, kernel 5.5 and unfortunately also 5.6 are showing me flickering between a completely black screeb and the game itself in very rapid succession. Not playable at all. I already considered it unplayable on older kernels due to the rapidly changing brightness, but the current situation is MUCH worse.
Anything I can do to help debug this issue?