No sound through HDMI cable after upgrading to Lion

After upgrading to lion I can not get any sound through my hdmi cable connected to the TV. It did work before. There is no optional source to choose under "Sound"  - only internal speakers. How can that be? Any suggestions what to do?

You arent the only one.
I guess that is a thunderbolt bug and needs to be fixed by apple.
https://discussions.apple.com/message/15721430#15721430

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