Are you able to have sound working(speaker, mics, and headphone) using the vanilla AppleHDA together with the Legency kext you provided under 10.6.3? I have a x61s, which should have the same sound configuration as your x61T, running at 10.6.3 x64 mode. I couldn't see any devices under sound in the preference panel. The system profiler shows only Device ID: 0x17AA20AC and Audio ID: 0. I am wondering if the right information in the Legency kext is actually being used by the kernel.
IOKitPersonalities->BuiltInHDA->HDAConfigDefault->7 (which has the correct codecID, and layoutID 10 is also used in the following layouts/pathmap information)
Do you know if there is a way to verify?
SNOW LEO VANILLA SPEEDSTEP
Regarding this thread:
I was able to generate a DSDT file for VANILLA SPEEDSTEP.
This guy also provided a Legacy File for "Serial, Atheros WiFi, SpeedStep C-States". I added Legacy Information for "x61tablet Sound Card, Bluetooth device".
Please PM me, if i should have that hour posting the DSDT patches.
X61 Tablet 1.6 Ghz C2D