|The BIOS is driving the graphics when in the POST/BIOS mode. So changing the resolution in Windows will not have any affect on it. I suppose if the GPU was designed to perform a certain way the POST screens could show on a second display. Perhaps some do. Laptops may not work the same way as desktops though. |
The BIOS is OS independent. That is by design. That is why there are settings in the BIOS(ACPI) to hand off hardware configuration to the OS if it is capable. Most, if not all, modern versions of OSes that can run on a PC are capable of configuring the hardware. If they weren't you wouldn't be able to have so many devices. Devices now can share resources (IRQs).