Can you boot your kernel with "log_buf_len=8M drm.debug=0x14 nouveau.debug=disp=trace,i2c=trace,bios=trace" and post an updated log?

Created attachment 130841 [details]
extracted journalctl log #2

kernel log with "log_buf_len=8M drm.debug=0x14
nouveau.debug=disp=trace,i2c=trace,bios=trace"

Created attachment 130842 [details]
photo taken from primary output during boot

(In reply to xen from comment #3)
> Created attachment 130842 [details]
> photo taken from primary output during boot

Ah, thank you.  I know what's going on here, it relates to some as of yet unimplemented display architecture changes that GM20x requires.

I shall fix it, but it might take me a little while to figure out how exactly to go about it.

If you build the kernel module from my tree[1], I believe your issues will be resolved now.

[1] https://github.com/skeggsb/nouveau/commits/master

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