Since version 2.22.2 GNOME has introduced a new feature in power management - Autodimming the screen after some inactivity. Although this feature is direct copy from MacOSX, it's a really nice one. But the default timeout of 30 sec seems too short for most cases. I was wondering how to increase it and here's how:
- Run gconf-editor. (Press Alt+F2 and enter 'gconf-editor')
- Go to /apps/gnome-power-manager/backlight
- Change the value of idle_dim_time. It's in seconds, 60 seems to be reasonable.