AMD RX 5700 XT does not seem to display correctly (if at all) in Debian Bullseye (Testing) despite having installed drivers and firmware.
 

Hello, I have recently built a PC and installed Debian. After a day or two of trying to figure out why I couldn't start Xorg, I managed to get a seemingly functional desktop. At one point, I decided I wanted to use GPU Passthrough for a project of mine. After adjusting some configurations, I rebooted my system only to realize that apparently Debian was using the card I wanted to passthrough while refusing to use the other the entire time.

After about another day or two of fruitless package-swapping and rebooting, I didn't manage to get anywhere new. Currently my desktop seems to be stuck at 1024x768.

Here is my configuration.

Debian Testing (Upgraded from Debian 10 Stable)

CPU : AMD Ryzen 9 3990x

AMD RX 5700XT (This is the card I want to use on my regular desktop.)

AMD RX 590 (This is the card I want to use for passthrough, apparently it was also the one the system tried to use (Which is odd, because I definitely recall putting this NOT in the main PCI-E slot (As specified in the motherboard's manual.) but instead the card I actually wanted to become the primary card.))

I have previously installed drivers and the required nonfree firmware, I may need to reinstall them again if it turns out something didn't register correctly.