The issue has been fixed in that update https://launchpad.net/ubuntu/+source/unity-control-center/14.04.3+14.04.20140220.2-0ubuntu1
** Changed in: unity-control-center (Ubuntu) Status: Triaged => Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to unity-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1276063 Title: Mysterious unlabelled switch next to volume slider in "Sound" Status in “unity-control-center” package in Ubuntu: Fix Released Bug description: In the "Sound" panel, the volume slider has a switch next to it. This switch is unlabelled and its purpose is not at all obvious. It turns out that this switch is for muting sound, and not for, say, allowing volume to be increased beyond 100%. <https://wiki.ubuntu.com/Sound#PC>: "'Output volume:' ... should be followed by checkboxes for 'Mute'..." To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity-control-center/+bug/1276063/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp