[Nouveau] [Bug 89664] Nouveau fails to enter KMS with the Gigabyte G1 Gaming GTX970

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89664

--- Comment #28 from Ben Skeggs <skeggsb at gmail.com> ---
(In reply to Mikołaj Świątek from comment #27)
> (In reply to Ben Skeggs from comment #25)
> > (In reply to Mikołaj Świątek from comment #24)
> > > (In reply to Ilia Mirkin from comment #23)
> > > > Have a look at bug #100676. Is it the same issue? (Please test the patches
> > > > that were provided there.)
> > > 
> > > I don't *think* it's the exact same issue. The screen photo in that report
> > > is similar to what I see, though my text output is completely
> > > unintelligible, rather than just slightly corrupted. The reason I thought it
> > > was this bug was that the log messages about unknown connectors and failing
> > > to create encoders are identical with Omar's in my case.
> > > 
> > > In any event, I've built the kernel module from Ben's tree and it didn't
> > > change anything at all, same behaviour.
> > 
> > Can I see your kernel log output from that please?  Bonus points if you boot
> > with "log_buf_len=8M nouveau.debug=trace".
> 
> Tried to do it that way, but it somehow resulted in so much output that I
> couldn't even see the boot log with journalctl. I guess the kernel ring
> buffer fills up and  the beginning gets overwritten before journald can read
> it? Not an expert at debugging kernel modules by any stretch, so let me know
> if I'm missing something obvious here.
> 
> In the meantime, uploaded a run with nouveau.debug=debug.

I can't tell 100% for sure from that, but, there's *strong* evidence there to
suggest that yes, you are indeed seeing the bug Ilia mentioned.  You can
probably work around it in the meantime by plugging one of your displays into
another connector, or by trying the tree suggested in the other bug.

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