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Precision M6800 DisplayPort POST w/ Switchable Graphics

So the BIOS says you can have POST displayed on DisplayPort, now, I'm using a DisplayPort to VGA adapter, it works once the OS boots up,

However, when using hybrid graphics (switchable graphics) during POST and initial boot menus like Windows boot menu or Grub, nothing shows up.

I'm not sure if this is a BIOS problem or just that the adapter doesn't work with BIOS? Or if this is a bug in BIOS A25.

Any solutions here? The adapter is a Rankie DisplayPort to VGA (Model: Rankie R-1142-Adapter-DP-VGA-BK/B01).

It works however with the AMD GPU in Discrete graphics mode just fine though...

Any idea here?



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