Comment 116 for bug 271706

First, gnome-audio has nothing to do with your problem. gnome-audio is a package
with a bunch of audio files to be played when certain events occur, ie. an audio

As for using the dial "breaking the keyboard handling", I'm not quite sure what
it means. You could try using the dial on the command-line instead, with a tool
like evtest (not packaged, look for evtest.c on google), or printing whatever
xev gives you back (even if you need to switch VTs to get to the result).

My guess is that this Toshiba laptop needs a driver to make this button work
appropriately. Reassigning to the kernel, where hopefully somebody will have the
hardware to test this, and point the finger back at GNOME if it's indeed the
culprit (unlikely).