after an hour of playing around with 10.6.5, i discovered that we have to have a different FakeSMC for 10.6.5. I patched it together from different sources for our laptop (thanks to ProjectOSX) and its working OK. (first post of the thread updated.) Also i had to change the name of the laptop from MacBookPro4,1 to MacBookPro5,1 in SMBIOS.plist for the speedstep to work Vanilla AppleHDA does the job well for the audio part. I would say go on and update your hackbooks

Cheers

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MSI P5Q / C2D E8400 @ 3.0 Ghz / 8GB DDR2 800Mhz / PCIe ECS 9600GT 1Gb / ALC1200 / Windows 7 / OS X 10.8
ASUS K50IN (SX004L) / C2D T6400 @ 2.0 Ghz / 4GB DDR2 800Mhz / nVidia G102M 512Mb / 15.6" HD/LED / ALC662 / Dell 1490 802.11g / Windows 7 / OS X 10.8