I should probably also mention that all four displays are connected to
an ATI HD 5700.

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https://bugs.launchpad.net/bugs/1184063

Title:
  With nonrectangular multi-monitor arrangements, display region is
  wrong

Status in “xserver-xorg-video-ati” package in Ubuntu:
  New

Bug description:
  In Lubuntu 13.04, I have an unusual display configuration: three
  monitors arranged horizontally and a fourth centred above them. This
  worked fine in 12.04; after upgrading, the middle display is not
  working correctly.

  xrandr  --output DVI-1         --mode 1920x1080 --rate 60 \
          --output HDMI-0        --mode 1680x1050 --rate 60 --right-of DVI-1 \
          --output DVI-0         --mode 1280x1024 --rate 60 --left-of DVI-1 \
          --output DisplayPort-0 --mode 1280x1024 --rate 60 --above DVI-1

  Despite what xrandr claims, and no matter what I tell it, the middle
  display (DVI-1) remains at 1280x1024 and displays windows from the
  region 1280x1024+0+0, i.e. the region above the leftmost display
  (DVI-0) that shouldn't be displayed. Windows in the region
  1920x1080+1280+1024, i.e. the region DVI-1 actually occupies, are not
  shown anywhere. The other screens display correctly. (This can only be
  seen by dragging a window partway off of the topmost or leftmost
  screen into this region, since the mouse does move correctly and won't
  enter this region.)

  Additionally, if xrandr is used to turn DVI-1 off, it will not be able
  to turn it back on again. Like the region issue, it will claim the
  display is on when it is not.

  Additionally, the mouse cursor appears about twice as large as normal.
  It does, however, move across the screens correctly.

  Related: http://askubuntu.com/questions/299744/lubuntu-13-04-cannot-
  set-display-resolution-windows-invisible-huge-mouse-curso

  All of these things were working correctly on the same machine in
  12.04. I hadn't tried 12.10.

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