External Monitor Brightness Applet for the COSMIC™ desktop

Change brightness of external monitors via DDC/CI protocol. You can also quickly toggle system dark mode.

Install

Fedora

You can use this copr.

sudo dnf copr enable wiiznokes/cosmic-applets-unofficial
sudo dnf install cosmic-ext-applet-external-monitor-brightness

Other distros

sudo apt install just cargo libxkbcommon-dev git-lfs
git clone https://github.com/cosmic-utils/cosmic-ext-applet-external-monitor-brightness.git
cd cosmic-ext-applet-external-monitor-brightness
just build-release
sudo just install

Troubleshooting

Maybe you need to setup the necessary udev rules if ddcutil is old. For this to work you need write access to /dev/i2c-*. See https://www.ddcutil.com/i2c_permissions/.

Credits

Originally created by @maciekk64