I just figured out that gnome-display-properties uses
~/.config/monitors.xml and I noticed that there are two configuration
entries in there, with different values for my two monitors even though
they're the same monitors. I don't know where this info is coming from
though:

<monitors version="1">                                                          
                                                                
  <configuration>                                                               
                                                                
      <clone>no</clone>                                                         
                                                                
      <output name="HDMI-0">                                                    
                                                                
      </output>                                                                 
                                                                
      <output name="VGA-0">                                                     
                                                                
          <vendor>VSC</vendor>                                                  
                                                                
          <product>0x4b1b</product>                                             
                                                                
          <serial>0x01010101</serial>                                           
                                                                
          <width>1280</width>
          <height>1024</height>
          <rate>60</rate>
          <x>1600</x>
          <y>176</y>
          <rotation>normal</rotation>
          <reflect_x>no</reflect_x>
          <reflect_y>no</reflect_y>
      </output>
      <output name="DVI-0">
          <vendor>DEL</vendor>
          <product>0xa021</product>
          <serial>0x3150554c</serial>
          <width>1600</width>
          <height>1200</height>
          <rate>60</rate>
          <x>0</x>
          <y>0</y>
          <rotation>normal</rotation>
          <reflect_x>no</reflect_x>
          <reflect_y>no</reflect_y>
      </output>
  </configuration>
  <configuration>
      <clone>no</clone>
      <output name="HDMI-0">
      </output>
      <output name="DVI-0">
          <vendor>DEL</vendor>
          <product>0xa021</product>
          <serial>0x3150554c</serial>
          <width>1600</width>
          <height>1200</height>
          <rate>60</rate>
          <x>0</x>
          <y>0</y>
          <rotation>normal</rotation>
          <reflect_x>no</reflect_x>
          <reflect_y>no</reflect_y>
      </output>
      <output name="VGA-0">
          <vendor>???</vendor>
          <product>0x0000</product>
          <serial>0x00000000</serial>
          <width>1280</width>
          <height>1024</height>
          <rate>75</rate>
          <x>1600</x>
          <y>0</y>
          <rotation>normal</rotation>
          <reflect_x>no</reflect_x>
          <reflect_y>no</reflect_y>
      </output>
  </configuration>
</monitors>

-- 
Screen resolution not preserved
https://bugs.launchpad.net/bugs/351213
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