Asked around and were told that AMD ATOMBIOS wasn't storing device-specific configuration and I found that sus because I couldn't get eDP initialized with generic one provided by 3rdparty/amd_blobs and Intel has VBT for this exact reason...

Turns out my hunch was right, we're gaming :acat_sunglasses:
https://www.youtube.com/watch?v=7XlH_1Z0slk