[Bug 83835] New: Multi Stream Transport (MST) 1.2 Support

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83835

          Priority: medium
            Bug ID: 83835
          Assignee: xorg-driver-ati at lists.x.org
           Summary: Multi Stream Transport (MST) 1.2 Support
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: owen.riddy at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

I own a Radeon HD 7770 or 7790 (the exact number eludes). Since it was
advertised as "Up to 6 displays supported" and had 4 graphics ports on the back
of the card I mistakenly assumed that I could plug 4 random screens in and they
would work. Since then a close read the fine print revealed that connecting a
large number of screens likely needs a MST 1.2 hub.

I purchased a MST 1.2 hub. My fourth screen remains black and unresponsive, and
the software stack appears to be confused (xrandr listed only one of the two
screens connected by the hub as available for configuration). The conclusion
from this is that I am facing a software issue; further research suggests that
the infrastructure needed for MST 1.2 is not in place.

Is MST 1.2 support what I need to keep an eye out for?

What needs to happen for MST 1.2 support?

Is anyone working on this at the moment?

Is there anything I could do to help?

Cheers

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