Comment # 1 on bug 1128891 from Laurence Page

Very similar problem after zypper dup on 7th March 2019 which still persists
after a further (hopeful) zypper dup on 13th March 2019. Also reinstalled SDDM
and Nvidia drivers.

- SDDM boots to a black screen with a moveable arrow cursor

- Xorg.0.log shows similar message:

[    93.415] (EE) Failed to open authorization file
"/run/sddm/{8437ebea-d637-497f-a2ee-fdd1e2e3ec6b}": No such file or directory

- ls shows that the file does exist:

% sudo ls /run/sddm
{8437ebea-d637-497f-a2ee-fdd1e2e3ec6b}

- ps shows that the filename is being passed to /usr/bin/Xorg via the -auth
argument.

- Xorg.0.log then shows all input devices being removed

I can't see any evidence of SDDM login being active "in the dark". It just
seems to have hung. ps doesn't show a greeter process.

Graphics system seems to be functioning correctly as logging in with KDM is
fine.

Relevant software versions:

x11-video-nvidiaG05-418.43-9.1.x86_64
nvidia-computeG05-418.43-9.1.x86_64
nvidia-gfxG05-kmp-default-418.43_k4.20.7_1-9.1.x86_64
nvidia-glG05-418.43-9.1.x86_64

sddm-0.18.0-7.1.x86_64

kernel-default-4.20.13-1.2.x86_64