Screensaver no wake up

Could use some tips how to troubleshoot the grafix card not waking up from blank screen. I am not running a sys-gui (nvidia gpu) yet, should i?

The screensaver has been waking up without problems since i am running 4.1, not sure if the last dom0 update is responsible.

ps for now, configured the power button to shut down qubes in case the screensaver goes on again but that is not the way (;

pps turns out it comes back from blank screen if lock is off, would that relate in any way to a plymouth bug?