Asus P6T SE, i7 920, Radeon 4850.
Used the Lion install guides to install from another partition, prepared it using existing Lion setup (side note: MBR fix for Mountain Lion GM
FakeSMC from kozlek's latest HWSensors
, DSDT by ErmaC
Booted the install using Chameleon 2.1 svn2003, Graphics Enabler=No and -x to keep it safe. Setup went fine, Mountain Lion booted fine using same safe settings, Lion was upgraded.
Added deviceid of gfx card to ATI4800Controller.kext and switched Graphic Enabler=Yes with AtiConfig=Cardinal, fixed permissions and cache, QE/CI was back.
Ethernet - official Lion driver from Realtek still causes kernel panics after some time (sigh), so went with the rock stable AppleRTL8169Ethernet.kext
plugin from 10.6.8. Still works fine.
Audio - I do not do rollbacks, up to 10.7.4 I used to edit AppleHDA.kext plist and xml files manually using files from ErmaC's guide
and just binpatching it with HDA Wizard
(or perl oneliner). But now the Platform and Layout xml files are zlib compressed - after a quick search I found this script
. So audio works with the proper DSDT fix and Mountain Lion GM patched kext