Comment 161 for bug 207473

I think it's not just the brightness, either. It seems to be the
multimedia keys as well. Just trying to pause the music player with
the pause button on my Dell XPS M1330 is very difficult, because
pressing the pause button sends it twice, so the music pauses and
instantly unpauses. If I tap it a bunch of times, I eventually get
lucky and end up with an uneven number of keypresses received. The
same happens with next/previous and volume buttons (e.g. mute works
the same as pause).