Looks like SwayOSD doesn’t work with external monitors using DDC/CI

[jjramsey]

I'm a member of the "video" group but have an external monitor. SwayOSD doesn't change the brightness of my monitor.

The utility "ddcutil" does work on my monitor.

Here are the issues I saw, FWIW.

Changing screen brightness on KDE 6.1 (without using SwayOSD) works, even though /sys/class/backlight/ is empty. SwayOSD doesn't work for the purpose, though. Looks like KDE 6.1 can use DDC/CI as a backend.

When brightnessctl is installed, the OSD shows up; it just doesn't show any change in brightness. Without brightnessctl, there's no OSD for brightness at all. Note that brightnessctl requires the out-of-tree kernel driver ddcci-driver-linux to work with external monitors.

BTW, I had been using Labwc with the following keybinding config:

    <keybind key="XF86AudioMute">
      <action name="Execute"
              command="swayosd-client --output-volume mute-toggle"/>
    </keybind>
    <keybind key="XF86AudioRaiseVolume">
      <action name="Execute" command="swayosd-client --output-volume raise"/>
    </keybind>
    <keybind key="XF86AudioLowerVolume">
      <action name="Execute" command="swayosd-client --output-volume lower"/>
    </keybind>
    <keybind key="XF86MonBrightnessUp">
      <action name="Execute" command="swayosd-client --brightness raise"/>
    </keybind>
    <keybind key="XF86MonBrightnessDown">
      <action name="Execute" command="swayosd-client --brightness lower"/>
    </keybind>