[Nouveau] [Bug 110631] New: EDID confusion with LG 4K TV as monitor running X rather than wayland

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110631

            Bug ID: 110631
           Summary: EDID confusion with LG 4K TV as monitor running X
                    rather than wayland
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: horsley1953 at gmail.com
        QA Contact: xorg-team at lists.x.org

Starting with fedora 28 and going through fedora 30, the nouveau driver
produces a bad signal when trying to display X on my LG OLEDB6P 4K television.

Weirdly, with what is presumably the same driver, it displays a full UHD
resolution when running wayland rather than X. (I really don't understand why
something as low level as the video timing would be different between wayland
and X, but if someone does know, they probably know where the bug is too :-).

This isn't restricted to fedora either. I've just been testing a multi-boot USB
stick, and the drivers on the ubuntu 19.04 live CD and the System Rescue CD
6.0.3 produce the same "bad signal" errors on this monitor.

For details (like X log files) see:

https://bugzilla.redhat.com/show_bug.cgi?id=1575391

and 

https://bugzilla.redhat.com/show_bug.cgi?id=1648608

If I add nomodeset and forcevesa kernel parameters, I can boot and see (lower
resolution) video rather than a black screen.

Switching to the nvidia binary drivers makes the display work properly again.

Booting the USB stick on different systems with more conventional resolution
monitors, nouveau works fine.

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