Here's some output that perhaps is helpful

# Normal orientation with tearing:
$ xrandr
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 16384 x 16384
eDP connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 
344mm x 193mm
   1366x768      60.06*+  40.04  
   1280x720      60.06  
   1024x768      60.06  
   800x600       60.06  
   640x480       60.06  
HDMI-A-0 disconnected (normal left inverted right x axis y axis)

# Workaround configuration
$ xrandr
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 16384 x 16384
eDP connected primary 1366x768+0+0 inverted X and Y axis (normal left inverted 
right x axis y axis) 344mm x 193mm
   1366x768      60.06*+  40.04  
   1280x720      60.06  
   1024x768      60.06  
   800x600       60.06  
   640x480       60.06  
HDMI-A-0 disconnected (normal left inverted right x axis y axis)

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https://bugs.launchpad.net/bugs/1885474

Title:
  1366x768 screen resolution broken, all other resolutions OK

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