lg
Adjust the brightness of an lg ultrafine display.
Based entirely off of ycsos source.
Build
Dependencies
- gcc
- ncurses
- libusb
On Fedora, these can be installed via dnf:
sudo dnf install ncurses-devel libusbx-devel gcc
To build, run the following (replacing the C_INCLUDE_PATH with your system's path, if not using Fedora).
C_INCLUDE_PATH=/usr/include/libusb-1.0/ gcc main.c -lncurses -lusb-1.0 -o lg
Run
Sudo is required, or libusb segfaults.
sudo lg
Running with no arguments will ask you to press + / - to adjust the brightness.
It can also be called with an argument: + or - to increase or decrease the brightness and exit. This is handy for mapping keyboard shortcuts to brighten / dim your screen.
To avoid having to enter sudo all the time, add an exception to visudo:
sudo visudo
Add the following line (replace REPLACEME with your username):
REPLACEME ALL=NOPASSWD:/usr/local/bin/lg
This, assumes you've copied lg to /usr/local/bin.