# sysbacklight `sysbacklight` is a tiny tool meant to be used on configurations where `xbacklight` does not work. It changes the display brightness on the first sysfs backlight device of type raw. It is written in C using `libsysfs` so it is possible to install it SUID-root. ## License `sysbacklight` is free software under the GNU AGPL version 3. See `LICENSE` for details. ## Dependencies `sysbacklight` needs libsysfs. On Debian, you can install them with: `# apt install libsysfs-dev` ## Usage ### Report the current brightness level in percent `sysbacklight` or `sysbacklight ?` ### Set brightness to 42% `sysbacklight = 42` ### Increase brightness by 10% `sysbacklight + 10` ### Decrease brightness by 10% `sysbacklight - 10`