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In the "Brightness & Lock" interface disable "Dim screen to save power" and set "Turn screen off when inactive for: Never"You might find that the above solution is necessary, but not sufficient. The screen might still be blanking after 10 minutes. This is a default setting compiled into Xorg.To disabled it for the current session, run: xset s offYou can put this in your .xsession file to disable it upon every login.