The Predator key sends keyboard usage 0xC9, which lies outside the
logical range the keyboard declares, so the kernel never emits an input
event for it. It is also reported on vendor report 4 of USB interface 2
(04 81 ff on press). predatord now listens there and opens the app in
the active graphical session via the user's systemd manager.
The action is configurable on the System page: open the app, switch to
the next performance mode, or do nothing.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>