I am using Ubuntu 20.04.6 LTS (Windows/Ubuntu dual boot, with Ubuntu on an external SSD). A long time ago, I made changes such that my two external monitors (one with an HMDI cable and one with a USB-C to HDMI cable) work, but my laptop screen does not. This was fine before, but now I'd like to actually use Ubuntu without having to constantly connect to an external monitor.
The laptop screen is always blank with a single _ in the top left. It seems I am able to press CTRL+ALT+F3 and the screen will change to the typical non-GUI login screen (even though I can already be "logged in" and working on the two external monitors). If relevant, all three screens (both external and laptop screen) work just fine on Windows.
The output of xrandr (with both external monitors connected) is below. I have tried both USB-C ports on my laptop and it seems they are tied to DP-0 and DP-2. I am not sure what is tied to DP-1 and DP-3.
Screen 0: minimum 8 x 8, current 3000 x 1920, maximum 32767 x 32767
DP-0 connected 1080x1920+1920+0 left (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00*+ 74.97 59.94 50.00
1600x900 60.00
1280x1024 75.02 60.02
1280x720 60.00 59.94 50.00
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 59.94
640x480 75.00 59.94 59.93
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 1920x1080+0+371 (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00 + 143.86* 119.98 119.88 100.00 59.94 50.00
1600x900 60.00
1280x1024 75.02 60.02
1280x720 59.94 50.00
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 59.94
640x480 75.00 59.94 59.93
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
Here is the output of lshw -C video:
*-display
description: VGA compatible controller
product: NVIDIA Corporation
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: iomemory:fc0-fbf iomemory:fe0-fdf irq:92 memory:fb000000-fbffffff memory:fc00000000-fdffffffff memory:fe00000000-fe01ffffff ioport:f000(size=128) memory:fc000000-fc07ffff
*-display UNCLAIMED
description: VGA compatible controller
product: Advanced Micro Devices, Inc. [AMD/ATI]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:04:00.0
version: c4
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix vga_controller bus_master cap_list
configuration: latency=0
resources: iomemory:fe0-fdf iomemory:fe0-fdf memory:fe10000000-fe1fffffff memory:fe20000000-fe201fffff ioport:e000(size=256) memory:fc500000-fc57ffff
and the output of cat /etc/X11/xorg.conf:
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 525.147.05
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BusID "PCI:1:0:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
EndSubSection
EndSection
I've tried some of the things described in this post, but sadly my laptop screen still does not work. I am ideally looking for a solution where I can use my laptop screen and my two external monitors, but if there's a solution where I can switch between each configuration quickly (laptop screen when away from home and external monitors when home), that would also work.
