Thank's a lot Lemonsoda for all tracks you proposed.
Unfortunatly I am too stupid to understand DSDT editing.
I tryed but I did not found a tuto matching my limited understanding level.

I just have a curious problem right now, may be you can give me a track ?
here it is:
I still have a detail to fix on a particular configuration:
I am using an HDTV 1080 p Panasonic on one Hackintosh from HDMI output
that's a terrific display !
On Leopard no problem, as default display is over scanned so edges are missing.
you just need to go to display / options and deselect full screen, then edges are there.
Now on SL, doing the same gives me black screen with only mouse arrow visible. No way to come back. Copycat restaure is needed !
any idea ? May be something in the GFX string about outputs ?

Thank's
leon