Comment # 5 on bug 1050256 from Dave Plater

To reproduce: install drm-kmp-default in a 42.3 installation and boot into
plasma5. I normally have a saved session with firefox and konsole both with
multiple tabs and one kwrite instance. Four desktops firefox on 1 and
konsole/kwrite on 4. The hanging starts when I open thunderbird on desktop 2
and go back to firefox. Using sddm window manager. I'll try xfce which is my
backup gui.