Does anyone know if the issues at the top of this post were solved? I am seeing the exact same problems Surat posted months ago, with the current latest drivers, latest core, etc.
I also have the 6600 and need to run in 1080i. I also got it to run in 1920 with bad overscan, and lockup on video.
Does anyone run Myth in HD mode with a 6600? How the heck did you do it!?