Hi,
We have started (or well, we have done that for some time) testing OSX 10.7.4 on the Dells - i will continue to update this thread with our findings.
Problems:
ISSUE: It seems Apple is messing with AppleACPIPlatform.kext - after update, the D4x0 will see tons of boot errors
SOLUTION: Replacing it with the kext from 10.7.3 fixes the issue, LINK: http://team.osxlatitude.com/fixes/1074-d4x0/AppleACPIPlatform.kext.zip
Notes:
Please do not ask for support here - it will not be given and the post will be deleted or moved.