Here is a link to a working dsdt for G31m-es2l rev 1.1:

http://www.filedropper.com/dsdtv2soundlegacy

I used the LegacyALC883.kext and AppleHDA from 10.6.4 since that results in zero driver reported errors. Like I said, no sleepenabler or nullcpupm, and *everything* in both 64-bit and 32-bit modes flawlessly.

Here is what's in my boot.plist:

<key>Kernel</key>
<string>mach_kernel</string>
<key>Kernel Flags</key>
<string>arch=i386 pmVersion=21 PCIRootUID=1</string>
<key>GraphicsEnabler</key>
<string>Yes</string>
<key>Timeout</key>
<string>3</string>
<key>Legacy Logo</key>
<string>Yes</string>
<key>EthernetBuiltIn</key>
<string>Yes</string>
<key>GeneratePStates</key>
<string>Yes</string>
<key>GenerateCStates</key>
<string>Yes</string>