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I am a 12 hours Ubuntu 20.04 user old, came from windows 8.
my problem is that I have another monitor and want it to "extend" the display Join Displays but for a reason, both of the screens won't display together it's either the laptop screen or the external monitor. If I closed the laptop lid, then the external monitor will display, and if I opened the lid, the external monitor will show its screensaver animation and the display will be on the laptop's screen.

This is the display settings from laptop screen:

this is the display settings from laptop screen

this is what typing xrandr --query will show

Screen 0: minimum 320 x 200, current 2390 x 968, maximum 16384 x 16384
LVDS connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
   1366x768      59.99*+
   1280x720      59.97  
   1152x768      59.95  
   1024x768      59.95  
   800x600       59.96  
   848x480       59.94  
   720x480       59.94  
   640x480       59.94  
VGA-0 connected 1024x768+1366+200 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768      60.00* 
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94  
HDMI-0 disconnected (normal left inverted right x axis y axis)

Graphics card: Radeon HD 7640G and no updates in Additional Drivers tap in Software & Updates window.

any possible solution to make both of the screens work together?

UPDATE: I installed Linux mint 20 cinnamon edition, Fedora 32 and the problem still occurs.

Bon Echo
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2 Answers2

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Looking at the xrandr output, both displays are seen by your hardware. Your external monitor seems to be connected with VGA and has a resolution of 1024*768 But it also looks like the external display does not fully specify itself (edid) because it reports a physical size of 0mm x 0mm It also seems to be shifted vertically by 200pixels, the defined viewport is 2390 x 968 but this should not be a problem.

Since you already used xrandr we can try the following in a terminal

xrandr --output VGA-0 --off

This should switch off the external monitor. Now we switch it back on with it's preferred setting and putting it on the right side of your laptop screen :

xrandr --output VGA-0 --auto --right-of LVDS

Should this not work, a detailed description of your hardware might be needed, to see which driver is used for the hardware. Please share ~/.local/share/xorg/Xorg.0.log

Ferdi
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It might sound obvious, but did you checked in the bios settings of your laptop if there is not a setting that managed how your graphic adaptor behaves? I have a Thinkpad where I have to define whether the Intel or Nvidia graphic adaptor should be used... Windows might handle it automatically, Ubuntu not..

FlyingMG
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