I tried an experiment: I put the xorg.conf file back in /etc/X11, but
changed 'openchrome' to 'vesa', and restarted. The screen ends up being
split the same way, with the left-hand part of the logical screen
showing in the middle, but the mouse pointer position is the same as the
logical position: e.g. moving the mouse all the way to the left or right
moves the pointer to the center of the screen, and I can actually click
on icons etc where they appear, instead of on the opposite side of the
screen.

Running the openchrome driver, the screen looks exactly the same, but in
order to point at something on the screen, I have to move the pointer to
the corresponding position on the opposite half of the screen.

In either case, the display has the left and right halves reversed,
which looks like an address bit inverted. With the vesa driver, mouse
position corresponds to screen position for other objects, while with
the openchrome driver, mouse position corresponds to physical position
on the display. Apparently cursors are handled differently by the two
drivers.

-- 
Screen origin shifted to center, screen wraps
https://bugs.launchpad.net/bugs/495553
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