Dual monitor - acting like a single monitor

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1

Hi,

my dual monitor setup more or less work until just an hour ago. I, by accident start my Windows PC, which runs on a different physical machine, but uses the same monitors through switches.
After shutdown Windows the monitors switched back to Linux, but instead of showing two different screens it looks like a copy, even though that is not activated/configured.

I have no idea what happened, as I have run Linux and Windows in parallel quite often without any issues.
Having shut down Linux and started Windows the switches seem to be working fine, as I still have a working dual monitor setup there.

I will gladly provide any information that is need, but my very basic knowledge is at his ends.
I of course have found some solutions on this forum, which seem to be to complex for something that already worked without issues (like making a virtual Desktop).

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1280x720      60.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080     60.00*+  59.94    50.00    60.05    60.00    50.04  
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1280x720      60.00    59.94    50.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)

Best,
Edward

2

Hi @EdwardHyde,

I see you tagged this as plasma, and I also have a dual-monitor setup with plasma which is working fine, so just check you settings in Launcher → System Settings → Display Configuration → Display Configuration. These are mine, for reference:

3

Hi,

problem is, I can’t post pictures here (getting an error message). Otherwise I would have posted what you did. First I tried to disable/enable one of the monitors (using the tool you are using), moving the primary around, doing restarts in between, which didn’t work out.

But I have found a ‘solution’.
Just now I deactivated one monitors, shutdown the machine, went to lunch, restarted and actived the 2nd monitor again. Now it’s working :slight_smile:
Not sure what the reason for that behavior was and why I couldn’t change it via config.

Best Edward

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