Yes, I'm running the DSDT from the repository along with the newest BIOS I could find, 1602. Previous Lion install was 1502 underwhich everything ran perfect. Any help would be greatly appreciated!
I was in the same situation as you, i found a sort of temp fix. You will have to re-install mountain lion for this.
1) Surprising, Asus released a new bios for our motherboard, 170X, on August 1st. Download this, go to your bios, tools, EX Flash 2. Find it and flash it.
Set up the usual ahci, sleep s3, etc.
2) Install Mountain lion, download multibeast and kextbeast.
3) Install the voodoohda and applehda disabler from this thread :
http://www.tonymacx86.com/audio/63663-asus-p7p55d-enable-via-vt1828s-sound-10-8-a.html with kextbeast
4) Reboot, test if audio is working. If it is, install kextbeast, reboot
5) Install lnx2mac's realtek driver for the ethernet port. Reboot
6) Voila!
***You may get a few annoying kernel panics along the way. Keep on resetting the computer until you get through them. For me, it stabled out and all is fine now!
*** This installs nullcpupowermanagement.kext. Remove it if you want sleep (I didn't bother since my graphics card is currently glitched)