(WW) NVIDIA(0): ACPI: Error: Unable to find the DOS (Enable/Disable output
(WW) NVIDIA(0): switching) file path under /proc/acpi/video. The NVIDIA X
(WW) NVIDIA(0): driver will not be able to respond to ACPI display change
(WW) NVIDIA(0): hotkey events.
I have the lattest nvidia driver (185.18). In case it wasn't clear, brightness doesn't work.
from a custom 2.6.30-rc8 kernel in Xorg.0.log:
(WW) NVIDIA(0): ACPI: Error: Unable to find the DOS (Enable/Disable output
(WW) NVIDIA(0): switching) file path under /proc/acpi/video. The NVIDIA X
(WW) NVIDIA(0): driver will not be able to respond to ACPI display change
(WW) NVIDIA(0): hotkey events.
I have the lattest nvidia driver (185.18). In case it wasn't clear, brightness doesn't work.