Comment 45 for bug 1292398

@HaraldK

Weirdly, I actually mean on the left. I tested different configurations where the origin was not 0,0 (for example moving both monitors by 1 to the right) and the monitors.xml file only takes when the primary display is on the left. For example:

<output name="eDP1">
          <vendor>APP</vendor>
          <product>0x9cf0</product>
          <serial>0x00000000</serial>
          <width>1440</width>
          <height>900</height>
          <rate>60</rate>
          <x>1920</x>
          <y>0</y>
          <rotation>normal</rotation>
          <reflect_x>no</reflect_x>
          <reflect_y>no</reflect_y>
          <primary>yes</primary>
      </output>
      <output name="VGA1">
      </output>
      <output name="HDMI1">
          <vendor>AOC</vendor>
          <product>0x2369</product>
          <serial>0x0000073e</serial>
          <width>1920</width>
          <height>1080</height>
          <rate>60</rate>
          <x>0</x>
          <y>0</y>
          <rotation>normal</rotation>
          <reflect_x>no</reflect_x>
          <reflect_y>no</reflect_y>
          <primary>no</primary>
      </output>

will not be used but swapping the HDMI1 monitor to be primary (as per previous attachment) will work.

I have not tried any vertical configurations.