You have been subscribed to a public bug:
If in the login section of lightdm sound is muted, when a user logs into the
Desktop Enviornment, volume controls are not able to unmute the volume.
This applys to Gnome3, Mate1.6, and Unity, possibly others Desktop Enviornments.
This bug gives the impression that sound doesn't work, despite having
functional hardware, and appropriate software settings in the DE.
** Affects: unity-greeter (Ubuntu)
Importance: Undecided
Status: New
** Tags: audio mute session-control sound
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Mute at login page, cannot be unmuted from logged in session
https://bugs.launchpad.net/bugs/1174859
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