In fact, you're using NVIDIA, and I know for a fact that these drivers
don't support changing brightness with xrandr, so you do need HAL.
Closing, as this isn't anything to do with g-p-m
** Changed in: gnome-power-manager (Ubuntu)
Status: Incomplete => Invalid
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Laptop backlight hotkeys not passed to gnome-power-manager without hal
https://bugs.launchpad.net/bugs/557588
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