@AceLan, after blacklisting video, Fn-F7 still does nothing with your patched kernel, but with the older lowlatency kernel I now get this message in the log: "keyboard: can't emulate rawmode for keycode 244".
@AceLan, after blacklisting video, Fn-F7 still does nothing with your patched kernel, but with the older lowlatency kernel I now get this message in the log: "keyboard: can't emulate rawmode for keycode 244".