[Nouveau] [Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #29 from Chris Paulson-Ellis <chris at edesix.com> ---
I didn't include 3bb076af during this bisect on the basis that it made no
difference when running nouveau HEAD. I have now retested the problem commit
cb75d97e and it's parent 70790f4f, both with 3bb076af cherry-picked.

Things just get more complicated... Although the fade-to-black problem hasn't
changed, including 3bb076af makes the previously working parent commit exhibit
the 'hsync' problem I described before!

All tests include the dpms-fix patch from comment 19 to prevent the original
hard-hang problem.

In summary:

1) 70790f4f + dpms-fix             -  works
2) 70790f4f + 3bb076af + dpms-fix  -  the 'hsync' problem reappears!
3) cb75d97e + dpms-fix             -  fades to black
4) cb75d97e + 3bb076af + dpms-fix  -  fades to black

There's quite a bit of difference in the console logs between 70790f4f &
cb75d97e, but nothing obvious (to me). I'm attaching console logs for cases 1,
2 & 4.

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