Quick add-on to previous comment: use "xrandr --current" to prevent the
command from causing the screen to freeze for a few ms.
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Have the same problem on Ubuntu 12.04 with Unity. Sometimes when I plug
in my HDMI TV to my Dell laptop the audio will not work, the HDMI audio
device is not present in Unity, Pulse says "available: no". This could
be connected to hibernation, but I'm not 100% sure. A reboot always
solves the probl
