System76 has released Linux 5.11 and Mesa 21.0 for both Pop!_OS 20.04 LTS and Pop!_OS 20.10. This incorporates support for RX 6000 series GPUs, which was the primary reason for the update.
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I have a 5700XT. as far as I know, it should work fine with kernel 5.11 and Mesa 21, but the GPU was finnicky to begin with, so its possible this update is what caused it to totally die.
in short, the GPU is capped at 640x480, which is so low that I can’t even get into BIOS to troubleshoot.