MacBook Pro Fluctuating Brightness over HDMI to TV

Hi every one,
after almost 5 years I finally found some clues in order to solve a problem which frustrated me all these years.
Every time I plugged my MBP into my Panasonic TV for watching a movie, I got some problem of brightness fluctuation during darker scenes.
I found this:
http://forums.macrumors.com/showthread.php?t=861730
And it seems to really speak about my issue.
How do I manage to change RGB level from 0 to 255, to 16 to 135 ?!?! From that discussion it seems the apple TV ha a personal settings to adapt to monitor, how can I do it in my MacBook Pro ?
Thanks a lot.
Riccardo

Sounds like there may be a short of some type in the Thunderbolt port.
Try leaving the Mac off, connect the cable then turn the TV on then the Mac.

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