[Bug 91202] Output to DVI-I (or DVI-D) is blank on Tonga (R9 285 and 380X) with multiple monitors

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=91202

--- Comment #23 from Thomas R. <freedesktop-bugs@digital-trauma.de> ---
Guido, does that mean that now it works for you, or simply that you can't say
one way or the other because you didn't test with DAL actually running?

I'm asking because I finally got around to compile amd-staging-4.7 (which only
works with a certain set of kernel options, BTW), and with DAL enabled and both
the last commit and f67b5d74 you mentioned, I still see this bug. So now I'm
confused - am I doing something wrong, or was the fix a victim of the numerous
DAL cleanups along the way, or maybe the freesync changes? I got "[drm] DAL is
enabled" in my kernel log at any rate, and freesync.c dumps stack traces in
warn_slowpath_null, which I guess is just a development help and nothing
serious.

If I'd find a branch with both a working and non-working revision in it I'd be
willing to bisect, but going back in staging-4.7 removes DAL completely, and
staging-4.6 doesn't even compile for me, which was when I gave up yesterday.

It's a shame because apart from this, 4.7 works really, really well. So if
there is anything I can do to properly triangulate this problem, I'd be very
eager to help.

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