Some time in the last week, nouveau was broken on my system. I'll try to do a git-bisect in the next couple of days to narrow it down. Xorg.0.log and dmesg logs (with debug=1) both before and after trying to start X attached.
Created attachment 10633 [details] Xorg log of failed session
Created attachment 10634 [details] Dmesg after unsuccessfull X attempt
Created attachment 10635 [details] Dmesg before trying X with nouveau
Should be fixed in drm git 023f7d9c0064f912415c92a85c3a9d722191909f.
Confirmed fixed. That was quick!
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