https://bugzilla.kernel.org/show_bug.cgi?id=208573
--- Comment #6 from Thomas Langkamp (thomas.langkamp@medicalschool-hamburg.de) --- (In reply to Thomas Langkamp from comment #5)
Created attachment 290817 [details] reproducable error messages after suspend, then reboot
This error message is reproducable if I boot
- with 1 display
- on KDE connect second display
- suspend, then wakeup (both screens work normal until this point)
- then reboot => error message, then black screen on one and green screen on
secondary display.
Because my Mainboard got a new Bios I tried that with no effect. But I realized, that I get the black screen only if I dial in the 3200 Mhz XMP Profile of my RAM. If not - there is no black screen with 2 displays on the new BIOS. On the old BIOS XMP Profile or not made no difference. Thus the mainboard may be part of the problem.
Still, Mainboard being part of the problem or not - all was fine til I switched the Fury X to the 5700 XT (first an ASROCK, now a Gigabyte one).