Just a question: Are you using Ubuntu like maximn? If so, it'd be better to recompile the kernel disabling the hybrid graphics support explicitly. I tried to find a solution for you there, but it seems there are some problems when using the acpi_call module (I think it needs to be compiled from source to work in Ubuntu kernels, don't know really) to disable your integrated graphics...

I can't really help you very much with this, sorry...

Cheers