[Bug 101026] RX 550 HDMI 4k 60fps not working, DisplayPort is.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101026

            Bug ID: 101026
           Summary: RX 550 HDMI 4k 60fps not working, DisplayPort is.
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: liammurphy at fastmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Hello everyone,

Please let me know what logs/command outputs I can give, not sure what would
help you all out.

I recently bought an AMD RX 550, first GPU with the Polaris architecture (so I
assume growing pains here), and am experiencing a bug where HDMI at 4k 60 fps
is not working, but DisplayPort does. 

HDMI 4k60fps is working for me under Windows, so to me it's safe to say this is
a Mesa problem. 

This was happening on Mesa 17.0.5 and 17.2 git on OpenSUSE Tumbleweed, in
addition to Mesa 17 on Ubuntu 17.04.

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