I don't think there are any performance degradation if you use either GraphicsEnabler=Yes or DSDT injection. I like DSDT injection more because I can inject a lot more information I want.
Things to consider - With no DSDT edits, using GraphicsEnabler=Yes, I get full video support with QE/CI; however, in About This Mac, not all of the correct information is displayed.
A few question:
1) Does relying on GraphicsEnabler=Yes for full video support result in any performance degradation? In other words, if it works, is that the best?
2) How do we get all the info to appear properly if we are using GraphicsEnabler?
3) Kind of similar to 1), but, is it better to get it working fully through DSDT, which is kind of what I'm thinking?
Sorry for late reply. I'll start working on your DSDT. Can you provide me your computer specification? Also I need your codec dump for audio. Thank you.