Multiple GPU problems. DRI_PRIME doesn't work

[u/throwaway6444377_]

I run my displays through a RX580 and render on a B580. This worked on Windows after some fiddling, and it allowed me to run interlaced resolutions and use the more powerful GPU at the same time. Not only can I not figure out how to output 960i (honestly I've given up for now), I can not for the life of me get the system to use the Intel card. I tried Mesa commands and launch options and I have tried DRI_PRIME 1. Doesn't want to work.

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[u/Hugh_Ruka602]

I have 2 AMD GPUs (780m iGPU and 7600XT eGPU, DRI_PRIME still works for me ... but for some reason the eGPU is picked up as GPU1 while iGPU is GPU2 ... was different before (gpu0 and gpu1).