Comment # 8 on bug 1017175 from Takashi Iwai

There is no error or any related kernel messages, so it's rather an issue in
sddm or DE, not the kernel.  The different kernel might give the different
behavior, but it doesn't mean that the kernel is buggy at all.  And I guess
this issue is independent from hardware.  Should be seen in a VM as well.

Reassigned to the bug owner of sddm, who may have a better clue.