try -legacy -v PCIRootUID=1 arch=i386 and replace finder for the DP2 thats worked for me! try to use iatkos L2 + mach kernel v4 or v5 from osx86.net and replace only dsdt.aml install the Bootloader Chameleon
You need a Snow Leopard To Install Lion...
Use Iatkos L2 OSInstall.mpkg search for it in System/Installation/Packages
Instal in another Partition but DONT REBOOT OR RESTART!
Change the mach_kernel for your kernel v5 or v4 (rename if needed)
After That replace your DSDT.aml if you have... in /Extra of your Snow Leopard to /Extra in Lion Partition
Install with Chameleon Wizard with Booth0md in lion HDD (if is another partition but the same HDD of SL i don't know if you can get some issues). And Select npci=0x2000 cpus=1 busratio=xx (xx = your clock multiplier you can check it in your SETUP BIOS) Check for AHCI LION ONLY RUNS IN SATA HDDS (IN MY CASE YES!!!) AND DVDs SATA! With AHCI MODE.
Reboot if you have installed in another HDD press F8 and type
-legacy -v PCIRootUID=1 arch=i386
If your Finder Doesn't work you need to go back do SnowLeopard or use MacDrive to Replace in Coreservices... in don't remember where but the guys will show you where is.
@EDIT I forgot you need to use Finder from DP2 because he's support 32 bits!
Thanks thats all...
if your system won't but... i can't help you.