Just one precision : I tried verbose mode, but it doesn't show KP while running OS X GUI (it shows KP only in console mode at boot).

About debug=0x144, it doesn't seem to work on hackintosh, but debug=0x100 is reported to work for KP display, according to insanelymac.

I'll keep you informed.

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Config : Intel Quad-Core Q8200 - Motherboard : GA-EG43-S2H - 2 GB RAM PC2-8500 - SATA Hard drive - Nvidia 9600 GT
Distribution : 10.6 Retail