I’m having a lot of trouble trying to change the backlight brightness on my Debian Sid system. I have a Macbook Pro with a 750M card, and the nvidia-driver package installed.
I have followed the post-installation steps for the nvidia driver, creating the following file:
/etc/X11/xorg.conf.d/20-nvidia.conf Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" Option "RegistryDwords" "EnableBrightnessControl=1;" Option "Backlight" "acpi_video0" BusID "PCI:0:2:0" EndSection
I’ve tried it with and without the two Options, and without the BusID, and every combination in between to no success.
Additionally, my boot parameters are:
ro root=UUID=096d751a-9a92-4dd7-b10c-42b13134b7e9 video.use_native_backlight=1 acpi_osi=Linux acpi_backlight=video
Again, I’ve tried it with every combination of parameters I can think of, and even changing the parameters for acpi_backlight to vendor or native.
In this current config, the
directory is NOT empty and contains
which when root, I CAN change the backlight brightness by issuing a command like the following:
# echo 7 >> /sys/class/backlight/acpi_video0/brightness
Yet, this also only works as root. Also, it is the only way to change the backlight I have found works. xbacklight does not work, and returns no error nor any change in backlight intensity.
I also tried downgrading the driver to 340-xx legacy driver, but that did not change anything.
Nouveau allows me to change the backlight normally with my keyboard buttons, but I need to use the proprietary driver for CUDA.
Any help is appreciated, thanks!!