[Bug 104412] RX 460 HDMI 4k 60fps not working, DisplayPort is.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104412

            Bug ID: 104412
           Summary: RX 460 HDMI 4k 60fps not working, DisplayPort is.
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: anaxi at aikq.org

Created attachment 136445
  --> https://bugs.freedesktop.org/attachment.cgi?id=136445&action=edit
drm grep of dmesg

As far as I understand with the release of kernel-4.15-rc 4k 60Hz over HDMI
should be supported with amdgpu and RX-460.
I can't get it to work. 
Displayport works fine.
HDMI Port and cabling tested with Windows and XBOX One X, both use 60Hz over
HDMI, only my linux box refuses to use 60Hz.

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