After having installed the proprietary Nvidia driver on Debian Jessie in order to play Steam games (which I now can), I can't change the brightness at all, it is stuck at the maximum and is irritating my eyes at night. I have already tried all of the solutions in the Debian wiki
such as adding the line: Option "RegistryDwords" "EnableBrightnessControl=1;" to /etc/X11/xorg.conf and /etc/X11/xorg.conf.d/20-nvidia.conf
but that has not worked, even though in the Debian forums it seems to work (marked solved):
xbacklight does not work at all, and I don't know what to do anymore. I will post any outputs for whatever terminal commands, please help.
xrandr --output LVDS1 --brightness 0.4(put your display instead of lvds1 if needed)? – jimmij Jan 11 '16 at 0:33xrandr --output LVDS-0 --brightness 0.2works! It doesn't seem to change the brightness at the hardware level, but it will save my eyes! Thanks to user jimmij! – System84 Jan 11 '16 at 0:44echo 2 > /sys/class/backlight/acpi_video0/brightnessdoesn't work? (again changeacpi_video0to your device like intel_backlight etc.). – jimmij Jan 11 '16 at 0:54sudo echo 2 > /sys/class/backlight/asus-nb-wmi/brightnessI get:bash: /sys/class/backlight/asus-nb-wmi/brightness: Permission denied– System84 Jan 11 '16 at 1:25sudo -sthen the eco. Sudo doesn't work over piped echos in the way described. You need to doecho "moo" | sudo tee /patch/to/file.txt– Torxed Jan 11 '16 at 8:44