iMac 12,1 internal display stuck at 640x480 resolution

iMac 12,1 internal display stuck at 640x480 resolution

I swapped out the GPU on this bad boy for the k2100m to get Metal support. Problem now is that the internal display is stuck at a low resolution. It was like this on boot and all the way through setup (thankfully voice over helped me with the clipped continue and skip buttons).

I was running Sonoma on it before upgrading, but emulating Metal wasn't cutting it. After upgrading I booted it up and it turned on fine in a normal resolution. After reapplying the patches, then the screen wouldn't turn on until I plugged in an external display. And that's when I noticed the low resolution, which has plagued me ever since, even if I reinstall Sonoma, Sequoia, or Ventura.

Have any of you experienced or seen this before. I'm at a loss of what I can try next to get this functional!

Cheers

submitted by /u/sonicswifty
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