I have two Dell P2715Q monitors connected to the Laptop. One is connected to the HDMI port and the other to the Type C port (via an HDMI dongle). The laptop does not recognize the connection on its HDMI port.
Laptop with connection on HDMI:
(base) anernest@Banda:~$ xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
1920x1080 60.03*+
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
(base) anernest@Banda:~$
Laptop with connection on Type C :
(base) anernest@Banda:~$ xrandr -q
Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+1055 (normal left inverted right x axis y axis) 309mm x 174mm
1920x1080 60.03*+
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 597mm x 336mm
3840x2160 30.00*+ 25.00 24.00
1920x1080 60.00 50.00 24.00
1680x1050 59.88
1280x1024 60.02
1152x864 75.00
1280x720 60.00 50.00
800x600 75.00
(base) anernest@Banda:~$
Laptop with connection on both HDMI and Type C
(base) anernest@Banda:~$ xrandr -q
Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+1055 (normal left inverted right x axis y axis) 309mm x 174mm
1920x1080 60.03*+
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 597mm x 336mm
3840x2160 30.00*+ 25.00 24.00
1920x1080 60.00 50.00 24.00
1680x1050 59.88
1280x1024 60.02
1152x864 75.00
1280x720 60.00 50.00
800x600 75.00
(base) anernest@Banda:~$