Comment 47 for bug 872652

I have a related problem, possibly not the same.

I am running Xubuntu 11.10 64 bit, patched only to normal distribution level, on a dell d620 laptop.

There is no gnome-settings application, the nearest I can find is settings->settings-manager-> and then various panels have settings related to blanking. it isn't very clear which should be used but any screen-blanking I've set to 'none' have so far had no effect - the screen still dims after a few minutes. I have installed dconf-editor as suggested elsewhere and used that to disable screen dimming, but it still dims.

After the screen has dimmed, pressing a key does not bring it back. However, the keyboard brightness changes (fn-cursor-up etc) DO work and must be used to bring the screen back to a usable brightness. The backlight is not switched off - it's just that it dims, and the normal level is not restored on a keypress.

Logging out does not fix this. In fact, it makes it worse : the screen brightness can be adjusted at the login menu but it jumps up and down with successive changes as described by another poster.