Simple test:
1) Unplugged external keyboard and mouse to avoid interference.
2) Set "Put display to sleep when inactive for:" to 1min.
3) Time for display to go off with some applications open: 2:34min.
4) Time for display to go off with all applications closed: 1:12min.
So, the CPU or something related is clearly involved.
** Changed in: gnome-power-manager (Ubuntu)
Status: Fix Released => Confirmed
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gnome-power-manager needs different idleness definition for turning off display
https://bugs.launchpad.net/bugs/289322
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