First of all download Kext Helper b7.

Download the file that corresponds to your setup.

With Kext Helper b7 install all the files found in the zip file.
Reboot and u should have qe/ci enabled.

hint: Preferably use Kernels 9.2.0 or 9.2.2 with ur Leopard installation.
hint: Use SwitchResX if u need to enable some non-standard resolution like 1440x900.