Same thing is happening here. My screen turns off every 30 seconds of inactivity.
For me, disabling DPMS by xset -dpms solves the issue. However I don’t see any misconfiguration of DPMS.
This is my GNOME settings
And this is my DPMS config:
DPMS (Energy Star):
Standby: 0 Suspend: 0 Off: 0
DPMS is Enabled
Monitor is On
(If DPMS is following this config, the screen should never turn off)
Any idea?