I have a theory that this might happen when I have set a user account to
disabled under System - Administration - Users and Groups. May need
some more testing to confirm.
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*** This bug is a duplicate of bug 126333 ***
https://bugs.launchpad.net/bugs/126333
I have the same problem, both in GNOME and KDE, regardless of whether Compiz is
enabled or not.
I have a desktop PC with a Cherry CyMotion Master XPress keyboard which has
volume control keys; they used to