Discovered a bug in nvidia's driver 185-18.14, which I logged at nvidia. Hopefully they will fix it, it's critical. I had data loss.
When the monitor switches off for power consumption reasons, it is not possible to turn it back on! No key on the kbd works, the mouse doesn't do anything as well, everything is completely locked out.
2 ways to get out of this: reset button or power off button.
opensuse devs told me it's nvidia related.