THANK YOU SO MUCH ! you have saved me ! i have spent days looking on how to get my MSI radeon 6770 working on mountain lion. You are the ONLY person to help! thanks again!
Just a note, GE=No means that the graphics card is working natively with OS X. So preferably that is what you are aiming for. If you do boot with GE=Yes, DSDT edits can enable you to boot instead with GE=No.
I tried your kexts but I'm still having the same issue.