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At the moment it uses just a few seconds of inactivity after that ubuntu reduces the brightness of my screen. Where do i find the option to increase this value?

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up vote 5 down vote accepted

This is the "Regard computer as idle after" slider on System → Preferences → Screensaver:

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Or the gconf key /apps/gnome-power-manager/backlight/idle_dim_time, which you can set thusly:

gconftool --type int --set /apps/gnome-power-manager/backlight/idle_dim_time 120

which will set the timeout to 120 seconds.

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thanks, it's the gconf key. It was default set to 10 seconds. For others who are interested in this issue. You can easily check what's the value of the key via gconf-editor. press Alt + F2 and then type in gconf-editor and search for the key as Iain posted. – NES Dec 13 '10 at 16:38
the gconf key does not work anymore. how can this be done in ubuntu 11.10/gnome3 ?? – Christoph Nov 18 '11 at 20:28

You can change this setting in the menu "System / Settings / Power management". This setting can be changed if you're running on battery.

(I have the Swedish GUI so I hope I remembered the English menu names correctly! ;)

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It looks like you must change the value of this key (which I made it a mandatory key, because I didnt want the users to change it.)

here's the key in gnome2 when your run the gonf-editor : /desktop/gnome/session/idle_delay

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