For sound you should check out VoodooHDA.kext
I am 99% sure it will work for you.
It works on my x205 when nothing else did.

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REAL Mac Pro - OC 3.1Ghz -2x 2.8GHz -XFX 5770 1GB / 8800GT- 10GB RAM -1.55TB - 2 SATA Optical - Lion / Snow Leo / Windows 7 x64 / in AHCI Mode
Toshiba X205-SLI6 17" Dual 8600M GT 256MB SLI, 400GB -
Win7 x64 / Lion vanilla / Snow Leo Vanilla - Full QE/CI - WiFi Dell 1390 (pin 20 removed) - ALC268 VoodooHDA - working fingerprint reader, Bluetooth well everything but display brightness changing.
Dell poweredge T110 2.8ghz 8 core xeon server 8gb ram