That could spare me the worst case scenario, which was a script that dispatches a key-press event at 29 seconds interval, I will check it up if nothing better arrives.
Thank you.
For what it’s worth, I did see this on a laptop I setup with Silverblue at #scale19x for the Fedora booth (some ancient ThinkPad very much on its last leg of life). The timeout and screen dim was disabled in settings, but it kept dimming it anyway. Unfortunately, I haven’t seen it on my equipment and wasn’t in a place to file a bug report on it, but I can verify I’ve seen this happen recently, myself.
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.
Also, DPMS is actually important. Without DPMS, after the set “Screen Blank” time, the screen will dim to dark but will not turn off (Backlight still on), which does not save any energy.