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Recently my Asus ROG SWIFT PG348Q has stopped working with my Ubuntu 18.04 Laptop. Other external monitors work fine, like my Samsung TV and my Dell U3417W.

The kernel I am using is 4.15.0-72-generic.

I can see that it is connected and recognized. It shows up in displays and this output is from xrandr:


Code:
HDMI-1-1 connected 3440x1440+3840+0 (normal left inverted right x axis y axis) 797mm x 333mm
  3440x1440    49.99*+
  1920x1080    60.00    50.00    59.94 
  1280x720      60.00    50.00    59.94 
  1024x768      60.00 
  800x600      60.32 
  720x576      50.00 
  720x480      60.00    59.94 
  640x480      60.00    59.94
I have tried switching to lightdm from gdm3 and using the Nvidia driver, but nothing works. I can't see anything happening in journalctl when plugging the monitor in.

Is there anything else I should try?
01-03-2020, 05:32 AM
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