This log shows that the probing detects the high resolution modes
[   111.418] (II) AMDGPU(0): Printing probed modes for output DisplayPort-0
[   111.418] (II) AMDGPU(0): Modeline "3840x2160"x60.0  533.25  3840 3888 3920 
4000  2160 2163 2168 2222 +hsync -vsync (133.3 kHz eP)
[   111.418] (II) AMDGPU(0): Modeline "3840x2160"x30.0  297.00  3840 4016 4104 
4400  2160 2168 2178 2250 +hsync +vsync (67.5 kHz e)

but doesn't appear to determine anything via DDC on the displayport.
Again this doesn't seem to have been an issue until the driver updates
applied on the 23rd (dpkg.log in separate attachment),


** Attachment added: "Xorg.0.log"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1784240/+attachment/5169275/+files/Xorg.0.log

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https://bugs.launchpad.net/bugs/1784240

Title:
  Driver doesn't correctly probe Samsung U28D590D 28-inch 4k  after
  recent update

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