Two external monitors show up in xrandr and in display dialog, but only one can be enabled

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Answer: 1

5 hours ago

Today I switched my USB-C dock and now I am experiencing interesting issues on my Tuxedo Notebook with Kubuntu 20.04.

I have two display connected to my laptop via the USB-C dock. Although both displays show up in xrandr (see below) and in the Display Dialog, only one of them can be enabled.

I can enable one or the other, but not both. If I switch both displays to "Enabled" in the dialog, that is not saved and when I re-open the dialog the second monitor is still not enabled.

I was unable to find anything similar in the forum. I tried adjusting the resolution as well as the refresh rate of the monitors, but that did not change anything.

I have a second Tuxedo Laptop (for work) which also runs Kubuntu 20.04 and that one connects via the exact same setup without issues...

Also with my previous USB-C dock and display, both laptops worked in this setup without issues.

Any hint into the right direction would be greatly appreciated!

eDP-1 connected 1920x1080+1152+484 (normal left inverted right x axis y axis) 309mm x 173mm
   1920x1080     60.01*+  60.01    59.97    59.96    59.93  
   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 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1-1 connected 1152x2048+0+0 right (normal left inverted right x axis y axis) 510mm x 290mm
   2048x1152     59.91*+
   1920x1080     60.00    50.00    59.94    25.00    24.00    23.98  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    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  
DP-1-2 connected (normal left inverted right x axis y axis)
   2560x1440     59.95 +  74.97  
   2048x1080     60.00    24.00  
   1920x1080     60.00    50.00    59.94    25.00    24.00    23.98  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    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  
DP-1-3 disconnected (normal left inverted right x axis y axis)
DVI-I-4-4 disconnected (normal left inverted right x axis y axis)
DVI-I-3-3 disconnected (normal left inverted right x axis y axis)
DVI-I-2-2 disconnected (normal left inverted right x axis y axis)
DVI-I-1-1 disconnected (normal left inverted right x axis y axis)

EDIT:

to add some more information, the output of xrandr --auto shows an error with CRTC 2:

xrandr: Configure crtc 2 failed

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