https://bugzilla.kernel.org/show_bug.cgi?id=212293
--- Comment #3 from Sefa Eyeoglu (contact@scrumplex.net) --- This took some time, as I apparently went wrong paths sometimes.
Anyways.
I bisected between tags v5.10 (good) and v5.11 (bad), while only looking at path "drivers/gpu/drm/amd".
At the end I landed at commit 12f4849a1cfd69f3c37cca042f2e9c512f923741 by Simon Ser (emersion).
I will do some debugging myself to see if it's the real deal, but that change might very well be it.