Installed iDeneb on your Gateway M-Series? I did. Here's the kexts to finish it off.
AppleACPIPS2Nub.kext - Your Keyboard
ApplePS2Controller.kext - More Keyboard
AppleHDA.kext - Sound
These were gathered from around the forums. I used them with Kext Helper b7 on iDeneb v1.3 10.5.5. If it doesn't work for you don't blame me.
Open Kext Helper.
Drag all 3 files in it.
Type in your password.
Reboot with -f.
Working Kexts - Zip