Same issue here with the same motherboard.
It never worked for me since 2009 till now with latest chameleon.
This is my org.chameleon.Boot.plist:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "
http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CSTUsingSystemIO</key>
<string>Yes</string>
<key>EthernetBuiltIn</key>
<string>Yes</string>
<key>GenerateCStates</key>
<string>Yes</string>
<key>GeneratePStates</key>
<string>Yes</string>
<key>Graphics Mode</key>
<string>2560x1440x32</string>
<key>GraphicsEnabler</key>
<string>Yes</string>
<key>Kernel</key>
<string>mach_kernel</string>
<key>Kernel Flags</key>
<string>darkwake=0</string>
<key>KeyLayout</key>
<string>mac-de</string>
<key>PciRoot</key>
<string>1</string>
<key>SystemId</key>
<string>00000000-0000-1000-8000-00xxxxxxx</string>
<key>Theme</key>
<string>wetOS-light</string>
<key>Timeout</key>
<string>1</string>
<key>UseKernelCache</key>
<string>Yes</string>
</dict>
</plist>
I appreciate your help.
Thanks
Len