I've bought new OSX 10.8. from app store, created installation USB and installed it on my spare HD (I'm still running 10.7.4. as a main OS). After reboot I've installed only dsdt.aml for xbx2. Everything was working except onboard audio. Since I don't have separate audio card the only solution was to use latest voodoHDA. But be aware that dsdt is conflicting with voodooHDA, so you have to delete dsdt.aml before installing voodooHDA otherwise the system won't boot properly. Obviously I am currently using only voodoHDA and IOAHCIBlockStorageInjector (to avoid showing internal disks as external - in orange color) - without dsdt. Hope this will help you.
The functionality is just the same as in Lion (10.7.4.) - sleep, on-board audio, etc... The only issue I have (both in Lion and ML) is that sound is not working after restart and I have to replug the audio cable. Although it is fully functional after waking up from sleep (not a big deal since I am using sleep all the time).



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