Have you checked if the headphone volume is not just muted?
Double-click on the volume icon. The mute/unmute button is at the bottom
under "Headphone"
** Changed in: gnome-audio (Ubuntu)
Sourcepackagename: gnome-audio => gnome-applets
Severity: Normal => Minor
Assignee: (unassigned) => Ubuntu Desktop Bugs
Status: Unconfirmed => Needs Info
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Sound Control Not work with headephone
https://launchpad.net/bugs/34842
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