I can confirm this workaround works, thanks for the link, MGMainz.
Either open gconf-editor and navigate to apps -> gnome-power-manager -> backlight and set "enable" to false (uncheck) or paste the following into a terminal:
gconftool-2 --set "/apps/gnome-power-manager/backlight/enable" --type bool "false"
After a reboot (or a restart of gnome-power-manager) the problem is gone.
I can confirm this workaround works, thanks for the link, MGMainz.
Either open gconf-editor and navigate to apps -> gnome-power-manager -> backlight and set "enable" to false (uncheck) or paste the following into a terminal: gnome-power- manager/ backlight/ enable" --type bool "false"
gconftool-2 --set "/apps/
After a reboot (or a restart of gnome-power- manager) the problem is gone.