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I currently have a LeNovo L580 Laptop using a Dock station also from LeNovo.

I already have 2 monitors connected to this dock and I would like to connect a third one, but the docker doesn't have more available ports, but the computer has an HDMI output. But when I connect the monitor, nothings comes up.

This is the output of the xrandr command:

eDP-1 connected 1920x1080+3876+0 (normal left inverted right x axis y axis) 344mm x 194mm

   1920x1080     60.02*+  60.01    59.97    59.96    59.93    48.00  

   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 disconnected (normal left inverted right x axis y axis)

HDMI-1 disconnected (normal left inverted right x axis y axis)

DP-2 disconnected (normal left inverted right x axis y axis)

HDMI-2 disconnected (normal left inverted right x axis y axis)

DP-1-1 connected 1920x1080+0+5 (normal left inverted right x axis y axis) 527mm x 296mm

   1920x1080     60.00*+  60.00    50.00    59.94    24.00    23.98  

   1600x1200     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-1-2 connected primary 1920x1080+1927+0 (normal left inverted right x axis y axis) 527mm x 296mm

   1920x1080     60.00*+  60.00    50.00    59.94    24.00    23.98  

   1600x1200     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)

I'm assuming this HDMI-2 is the third connected monitor. I already tried to disable the display from the notebook itself and enable the third monitor using the commands:

xrandr -d :0 --output eDP-1 --off

xrandr -d :0 --output HDMI-2 --auto

But still doesn't work. Does anyone knows what could it be and how to make it works?

Thanks!