HDMI Video corruption under Mountain Lion

I have a mid 2011 15 inch Macbook pro. Upgraded to Mountain Lion. I use an HDMI TV connection as an external monitor with the laptop closed. I switch to another work PC on the TV using the source selection. This causes the Mac to Sleep because no external monitor is detected. When returning to the mac and waking it up via a blue tooth track pad, the video is corrupted. It's just scrambled.
Unplugging the monitor and plugging it back in, doesn't help.
Unplugging the monitor, opening the mac, then plugging in the cable fixes it. I use a mini display port to HDMI connector.
This worked fine with no corruption under Lion - but it is easily reproducable with corruption under Mountain Lion.
Any advice?

Opening and closing the lid corrects the problem by causing the external monitor to refresh.
It doesn't have to be disconnected and reconnected.
The problem still occurs after the 10.8.1 update.

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