On Manjaro using Gnome 44 on X11 (linux kernel 6.3.5-2) the screen turns black after 30 seconds without mouse movement or keyboard strokes.
In Settings >> Power, I have set Screen Blank to ‘Never’:
xset q, however, it shows me that screen timeout is set to 0:
DPMS (Display Power Management Signaling): Standby: 0 Suspend: 0 Off: 0 DPMS is Enabled Monitor is On
I have seen this post, but I don’t know which “Automatic Power Saver” @Cl00e9ment is refering to: Screen blanks after only 30 seconds of inactivity since the last update (Gnome 43)