https://bugzilla.kernel.org/show_bug.cgi?id=198123
--- Comment #37 from shibe@tuta.io --- (In reply to Michel Dänzer from comment #36)
Can you try the latest test patch attached here, and attach the dmesg output from running with it?
With the patch, the background is always black. I guess, there is a race, and the patch affects the outcome.