Code review comment for lp://staging/~yuningdodo/ubuntu/trusty/unity-settings-daemon/unity-settings-daemon.lp1396464-set-volume-to-zero-before-mute

David, when the bug #1396464 is reproduced I dump the volume value and is_muted by adding some printf() and found is_muted is true while volume is not zero, however to be honest I don't know the root cause, the underlying logic in unity-settings-daemon and unity-control-center is complicated and I didn't find out how this inconsistency finally leads to the loop. My patch is only a toplevel workaround, it didn't fix the internal logic trap, if there is any.