Just a few tests that I made: 1. Since I read about problems regarding remote filesystems, I commented all these in /etc/fstab. It made not difference (after restarting the machine) regarding the described issue.
2. I could 'init 1' from a text console (ctrl-alt-f1). But after entering root pw and # reboot I got the same problem as before. 3. From a text console (ctrl-alt-f1), I tried to stop kdm (/etc/init.d/kdm stop)... huh !? Same problem (not sure how/why 'init 1' worked in 2.). 4. Now I changed to sddm... Heyho, 'Shutdown' from the menu works. But 'Reboot' still has the old problem (black screen, blinking cursor in top left corner). BTW, I have a i915 gfx driver running. Meanwhile it seems to be more than one problem here. I want to state that my biggest concern is that systemd stops working without a timeout. I could see no evidence of a kernel crash (which would be an excuse for systemd to stop working).
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