Select graphics card for console output

I finally found this is done with a kernel feature called vga arbiter. Whichever VGA adapter is used as primary by the BIOS ends up being flagged a the "bootvga" device. Its possible to force vga arbiter to select and use the next vga adapter by using the stub driver for the undesired VGA adapter. Retrieve the pci device id using lspci -nn | grep VGA
Add this parameter to your kernel command line pci-stub.ids=0000:0000

When I move to RHEL 7, I'll be doing pci passthrough with this disabled adapter. Remember Nvidia graphics cards also include an audio device and end up in the same IOMMU group as the VGA device. Both pci device ids will need to be stubbed.