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I have a Dell XPS 13 (9370) with Intel UHD Graphics 620 (Kabylake GT2) integrated graphics. I have it connected to two identical external displays via a Dell TB16 dock. Both are connected via HDMI. The primary display looks fine but the secondary monitor's colors are washed out. I tried -set "Broadcast RGB" "Automatic" but it didn't do anything. I then noticed that the second monitor doesn't list Broadcast RGB as a property like the primary monitor does:

$ xrandr -q --prop
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
eDP-1 connected (normal left inverted right x axis y axis)
  EDID: 
      00ffffffffffff004d108b1400000000
      281b0104a51d11780ede50a3544c9926
      0f505400000001010101010101010101
      0101010101014dd000a0f0703e803020
      350026a510000018a4a600a0f0703e80
      3020350026a510000018000000fe0038
      58444859824c51313333443100000000
      0002410328011200000b010a2020002e
  scaling mode: Full aspect 
      supported: Full, Center, Full aspect
  Broadcast RGB: Automatic 
      supported: Automatic, Full, Limited 16:235
  audio: auto 
      supported: force-dvi, off, auto, on
  non-desktop: 0 
      range: (0, 1)
  link-status: Good 
      supported: Good, Bad
   7680x4320     15.83    59.99    59.99    59.99  
   5120x2880     59.99    59.99  
   4096x2304     59.99    59.98  
   3840x2160     60.00    60.01    59.98    59.97  
   3200x1800     59.96    59.94  
   2880x1620     59.96    59.97  
   2560x1600     59.99    59.97  
   2560x1440     59.99    59.99    59.96    59.95  
   2048x1536     60.00  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   2048x1152     59.99    59.98    59.90    59.91  
   1920x1200     59.88    59.95  
   1920x1080     60.01    59.97    59.96    59.93  
   1600x1200     60.00  
   1680x1050     59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1360x768      59.80    59.96  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      60.00  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
DP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
  _MUTTER_PRESENTATION_OUTPUT: 0 
  EDID: 
      00ffffffffffff000469a42701010101
      251a0103803c2278ea2fa5a554509e27
      105054bfef00714f818081409500a940
      b300d1c00101023a801871382d40582c
      450055502100001e000000fd00324c1e
      5311000a202020202020000000fc0056
      4e3237390a20202020202020000000ff
      0047394c4d51533031373237390a0132
      02031ef14b900504030201111213141f
      230907078301000065030c001000023a
      801871382d40582c450055502100001e
      662156aa51001e30468f330055502100
      001e011d007251d01e206e2855005550
      2100001e8c0ad08a20e02d10103e9600
      555021000018011d8018711c1620582c
      250055502100009e000000000000007b
  Broadcast RGB: Automatic 
      supported: Automatic, Full, Limited 16:235
  audio: auto 
      supported: force-dvi, off, auto, on
  non-desktop: 0 
      range: (0, 1)
  link-status: Good 
      supported: Good, Bad
   1920x1080     60.00*+  50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1280x960      60.00  
   1366x768      59.79  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
DP-2 disconnected (normal left inverted right x axis y axis)
  Broadcast RGB: Automatic 
      supported: Automatic, Full, Limited 16:235
  audio: auto 
      supported: force-dvi, off, auto, on
  non-desktop: 0 
      range: (0, 1)
  link-status: Good 
      supported: Good, Bad
DP-2-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 597mm x 336mm
  _MUTTER_PRESENTATION_OUTPUT: 0 
  EDID: 
      00ffffffffffff000469a42701010101
      251a0103803c2278ea2fa5a554509e27
      105054bfef00714f818081409500a940
      b300d1c00101023a801871382d40582c
      450055502100001e000000fd00324c1e
      5311000a202020202020000000fc0056
      4e3237390a20202020202020000000ff
      0047394c4d51533031373238320a0138
      02031ef14b900504030201111213141f
      230907078301000065030c001000023a
      801871382d40582c450055502100001e
      662156aa51001e30468f330055502100
      001e011d007251d01e206e2855005550
      2100001e8c0ad08a20e02d10103e9600
      555021000018011d8018711c1620582c
      250055502100009e000000000000007b
  non-desktop: 0 
      range: (0, 1)
  link-status: Good 
      supported: Good, Bad
   1920x1080     60.00*+  50.00    59.94  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1280x960      60.00  
   1366x768      59.79  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
DP-2-2 disconnected (normal left inverted right x axis y axis)
  non-desktop: 0 
      range: (0, 1)
  link-status: Good 
      supported: Good, Bad
DP-2-3 disconnected (normal left inverted right x axis y axis)
  non-desktop: 0 
      range: (0, 1)
  link-status: Good 
      supported: Good, Bad

DP-2-1 is my second external monitor. Any help would be appreciated. Thanks.

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