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.