Lion Upgrade: No audio via miniDisplayport to HDMI (iMac)
Using the mid 2011 iMac and a (Denon1912) A/V-Receiver. iMac connected via miniDisplayport-to-HDMI-adapter to the receiver.
With Snow Leopard it worked. Video and Audio were always detected by the receiver and sent to the monitors/speakers.
With Lion the video-output of the iMac only gets activated when i put the computer to sleep and wake it up. The audio-output via miniDisplayport/HDMI does not work. The audio-options do not list my receiver - only the internal speakers.
Cables are connected on startup, A/V-Receiver is turned on and set to the correct channels before booting the iMac.
How can I fix this? Downgrade and wait for bugfixes?
iMac, Mac OS X (10.7)