After a fresh install of Ubuntu 12.10, my screen still goes off after about ten minutes. I've been to the Brightness and Lock control panel. The
Turn screen off when inactive for: setting is set to
I've been through the
dconf editor searching for
idle changing parameters. This doesn't seem to have any effect on the display timeout.
Here's one more interesting thing, the screen doesn't go off, it just goes black. The back lighting is still on, and all the pixels are black.
When it goes black, it does a very pleasant quick dim to black.
Similarly, it quickly un-dim's after a key press, mouse movement, or mouse click.
There are multiple different layers, that influence the behavior of the monitor. To completely disable any suspension of the monitor you need to disable it in every of those layers:
1. layer: virtual consoles
Sets the interval of inactivity, in minutes, after which the screen will be automatically blanked:
Sets the VESA powerdown interval in minutes:
2. layer: X
Turn the screen saver function off. The s option lets you set the screen saver parameters.
Disable DPMS if enabled:
To find out which values are set type
xset -qin a terminal. A part of the output should look like this:
3. layer: Last but not least; the application layer (XScreenSaver)
Choose Disable Screen Saver:
And deactivate screensaver in System Settings -> Brightness & Lock (depends on your desktop environment):
Turn screen of when inactive for: Never