Originally Posted by sPOiDar
OK, some more information coming here, no solutions at this stage sadly. I have a VAIO VGN-Z17GN/B, the Australian designation for the Z11, nvidia drivers 180.08_beta, kernel 18.104.22.168 (gentoo-sources-2.6.27-r4). Booting linux enables both Intel 4500MHD and nVidia 9300GS, at which point the Intel is functional, but the nVidia is not. Booting into WinXP, then rebooting disables the Intel, allowing the nVidia to function correctly until next reboot.
I am pretty sure that you can't active both video cards at the same time. You must use the hardware switch and perform a reboot