I have to say that I struggled to get this to work. I did this on my toshiba m55-s3293 (old, put proved to have the perfect hardware for a hackintosh)
Step 1: first I installed Ideneb 1.3 and selected no graphics drivers from the customize menu during the installation.
edit: you need to also install the application pacifist from the useful application list.
the install would go fine until I reboot and I am faced with the notorious light blue screen. no matter what I did (-x, -f, -v, Graphics Mode, etc...) I always end up with that blue screen.
Step 2: the only thing that enabled me to get to the system was to boot from the iDeneb CD again and hit f8 during the startup of the CD. Then I typed rd=disk0s2 -x
this command instructs the iDeneb CD to ignore booting from the CD and boot from the first hard Drive (disk0) and the Second partiton (s2) which is where I installed the osx iDeneb in step 1
This got me to boot the system in safe mode without the blue screen blocking the way.
Step 3: I used another machine to download the "Leopard Graphics Update for 10.5.2" from apple's website and then I downloaded the two kexts attached to this post. I then used a flash disk to transfer them to the machine where I installed iDeneb.
Step 4: install the Leopard Graphics Update. This didn't work for iDeneb because it's 10.5.5. The way to do it is to open the dmg file using the application Pacifist. you will find folder hierarchy simillar to that in the System.
in the package, go to System>Library>extensions and install all kexts that start with AppleIntelxxxxxxxx by dragging them to the application icon called Kext Helper b7 which is located in the iDeneb Folder in Applications.
when Kext Helper tells you that the install is fine, reboot the system as in Step 2
Step 5: once you are back in, install the two Kexts you downloaded from this post using Kext helper b7.
Step 6: when Kext helper tells you everything was installed fine, Cross your fingers and reboot normally without using the CD.
Your system should not hang at the blue screen anymore and you should have full qe/ci with hardware acceleration.
I hope this helps someone someday.
that did NOT WORK on my machine