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Hi Christopher,

Please count me in. I am using a Lenovo X250 and can't use 4k anymore.
Some weeks ago / some updates before it was working if the notebook was connected directly via DisplayPort.
4k via Lenovo Dock was never working.

System settings still offer 4k resolution but screen keeps black.

Thanks!

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https://bugs.launchpad.net/bugs/1512386

Title:
  4K support not working?

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  Hi guys

  I have an weird issue trying to get a 27" 4K monitor to work with my
  Lenovo X240...

  The X240 is supposed to be able to support 4K (3820x2160), but only at
  30hz...

  But every time I try to switch to 4k, the screen goes black... it
  doesn't not go into sleep mode, so it seems like it's receiving
  something from the machine, and the xrandr info also seems correct:

  Screen 0: minimum 8 x 8, current 4480 x 2160, maximum 32767 x 32767
  eDP1 connected primary 1920x1080+2560+0 (normal left inverted right x axis y axis) 276mm x 156mm
     1920x1080     60.04*+  59.93  
     1680x1050     59.95    59.88  
     1600x1024     60.17  
     1400x1050     59.98  
     1600x900      60.00  
     1280x1024     60.02  
     1440x900      59.89  
     1280x960      60.00  
     1368x768      60.00  
     1360x768      59.80    59.96  
     1152x864      60.00  
     1280x720      60.00  
     1024x768      60.00  
     1024x576      60.00  
     960x540       60.00  
     800x600       60.32    56.25  
     864x486       60.00  
     640x480       59.94  
     720x405       60.00  
     640x360       60.00  
  DP1 disconnected (normal left inverted right x axis y axis)
  DP2 disconnected (normal left inverted right x axis y axis)
  DP2-1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
     3840x2160     60.00*+  29.98  
     2560x1440     59.95  
     1920x1200     59.88  
     1920x1080     60.00    50.00    59.94    24.00    23.98  
     1600x1200     60.00  
     1680x1050     59.95  
     1280x1024     75.02    60.02  
     1280x800      59.81  
     1152x864      75.00  
     1280x720      60.00    50.00    59.94  
     1024x768      75.08    60.00  
     800x600       75.00    60.32  
     720x576       50.00  
     720x480       60.00    59.94  
     640x480       75.00    60.00    59.94  
     720x400       70.08  
  DP2-2 disconnected (normal left inverted right x axis y axis)
  DP2-3 disconnected (normal left inverted right x axis y axis)
  HDMI1 disconnected (normal left inverted right x axis y axis)
  HDMI2 disconnected (normal left inverted right x axis y axis)
  VIRTUAL1 disconnected (normal left inverted right x axis y axis) 

  All other resolutions works fine.. also 2560x1440...

  I have tried to connect the monitor through the mDP directly on the
  machine, and through DP and HDMI on the dock.. on HDMI the 2560x1440
  resolution isn't available, but on all the 4k resolution resolves in a
  black screen....

  Hope that someone can help...

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