I don't see any events when I run
xev and press either the brightness up or down keys.
I have configured i3wm to handle the
XF86MonBrightnessUp, but they won't get triggered because they are never published.
Using the brillo command to change the brightness from the command-line works great as a workaround, but it is really nice to be able to use the keys instead.
I'm running Arch Linux with kernel version 5.14.12-arch1-1.