I have exactly the same issue on my Acer Travelmate C202TMi. I can control the brightness via the hotkeys. But neither the slider in the gnome-power-manager (In fact the slider is not there) nor the brightness applet work. I'm running on the latest Gutsy with all available updates.
-- "Display brightness" slider does not show up on Dell Latitude D810 https://bugs.launchpad.net/bugs/116464 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
