Submitted my first Nouveau patch today. Some thoughts:
Nouveau folks have helped a lot. Definitely couldn't have figured it out without them <3
NVIDIA hardware was also pretty helpful. Instead of displaying garbage like you'd expect, it errors out and allows the driver to print what state changes caused the error.
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BTW, here are references to the various patches/bugs I've been working on: https://github.com/swaywm/wlroots/issues/2526#issuecomment-760445781
