PS: Writing to /proc/acpi/video/NVID/LCD outside of X works, but the
brightness keys do not work here as well.

Seems like the NVIDIA driver is blocking the brightness update via acpi somehow.
I am using driver version 177.80.

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backlight brighness control does not work (Samsung Q45 with Nvidia GForce 8400M)
https://bugs.launchpad.net/bugs/146710
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