sb

A simple brightness control for internal and external monitors

Usage

sb <output> <raise|lower|get> [step]

output is the DRM connector name: eDP-1, HDMI-A-1, DP-2, and so on. step is a brightness percentage, defaulting to 5 if you can't be bothered to specify one.

sb eDP-1 raise        # internal panel, +5%
sb HDMI-A-1 lower 10  # external monitor, -10%
sb DP-2 get           # current brightness percentage

raise and lower print the resulting brightness percentage to stdout, so callers can read the new value without a separate get call.

Building

make
make LDFLAGS="-static" # statically links the binary
make install  # installs to /usr/local/bin by default

(Requires make and a C compiler)

External monitor permissions

Your user needs access to /dev/i2c-*. Add yourself to the i2c group:

# Linux (most distros)
usermod -aG i2c $USER

Without this, sb will report cannot open /dev/i2c-N: Permission denied

License

CDDL Version 1.1