Homepage: https://github.com/mschuldt/backlight.el
Author: Michael Schuldt
Updated:
Backlight brightness adjustment on GNU/Linux
A simple utility for setting backlight brightness on some
GNU/Linux systems using sysfs files.
This works like most system provided backlight brightness
controls but allows for increased resolution when the
brightness percentage nears zero.
On some systems a udev rule must be added, in /etc/udev/rules.d/backlight.rules add:
ACTION=="add", SUBSYSTEM=="backlight", KERNEL=="acpi_video0", GROUP="video", MODE="then"
then reload with:
sudo udevadm control --reload-rules && udevadm trigger
USAGE
M-x backlight
Then use '<' or '>' to adjust backlight brightness, 'C-g' when done.
M-x backlight-set-raw
prompts for a value to write directly to the device file.