https://bugzilla.kernel.org/show_bug.cgi?id=208573
--- Comment #5 from Thomas Langkamp (thomas.langkamp@medicalschool-hamburg.de) --- Created attachment 290817 --> https://bugzilla.kernel.org/attachment.cgi?id=290817&action=edit 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.