I have a smilar problem. I am using Hardy Heron and my graphic card is GeForce 9600M GT series. So i am using the latest hardy-propesed package for the nvidia driver.
I am only able to set the brightness via nvidia-settings. Power Manager Brightness Applet 2.22.1 is not dimming the backlight. Same, no error, no flickering. Nothing happens. I posted to ubuntuforums a help request, may help you for some further info: http://ubuntuforums.org/showthread.php?t=863975 -- Laptop backlight adjustment problem https://bugs.launchpad.net/bugs/112054 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs