@stevenplanet - to answer your question - yes it works "fine" .... BUT yes when doing certain graphic functions as simple as Mission Control, the system does get ring stalls/ buffer hangs. My work around is posted in an earlier item. When i using the system in pure laptop mode - i.e. using just the LCD display (LVDS only) i often resort to using the Xcode toold Quartz Debug to disable 2D acceleration. at home, i usually have it in a laptop docking station with an external Display-Port attached monitor (and often with lid closed). So without LCD in play, that seems to eliminate these buffer stalls. Even so, with ML, i seem to see less of these hangs and can often use it just fine for email and browsing w/o quartz setting.... I just stay away from Mission control (or hot corners)!
@tetonne - can you be more specific about what is not working? my laptop is the same T420 type 4236. you mention you dont use dsdt? it has graphics, audio, usb fixes so its essential IMO. i noticed.... you have an older FakeSMC? i dont use sleepenabler or NullCPUPM anymore.
Hi tluck, if you don use sleepenabler or NullCPUM, what do you use? I have the same machine as you, it would be great if you could share your pack.
I also have the same artifacts issues with the video. I have looked all over, and there seems to be no solution. I usually get the freezes using Excel...