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[Peter Hutterer <peter.hutterer@xxxxxxxxx>]

The VertResolution/HorizResolution options shouldn't be needed on newer
touchpads anyway if the kernel provides it. So you can ignore those.

and yes, this is the same bug.

the problem is caused by the server needing to support true absolute
devices in relative mode (e.g. graphics tablets). If you have one of
those, a relative motion on the device should reflect the motion on the
screen - that's harder to do on touchpads where the aspect ratio and
sizes are out of whack.

fwiw, as of http://cgit.freedesktop.org/xorg/driver/xf86-input-
synaptics/commit/?id=0a4cf80a00663ff3ce8e76baf0940782576efe13, synaptics
doesn't need to be absolute anymore, you can replace all
xf86InitValuatorAxisStruct() calls with a min/max of -1. This makes the
axes truly relative and is the right solution. But you'll find the
pointer accel will be completely out of whack after that, if you manage
to find the magic numbers to tweak it back to what it currently is,
you've found the solution.

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https://bugs.launchpad.net/bugs/726832

Title:
  Touchpad speed scales with multimonitor size per axis

Status in XOrg-Driver-Synaptics:
  Confirmed
Status in xserver-xorg-input-synaptics package in Ubuntu:
  Incomplete

Bug description:
  When enabling a second screen, say horizontally next to the primary
  screen, horizontal touchpad speed increases proportionally to the
  increase in horizontal resolution. I assume the same happens when
  enabling multiple screens in a vertical configuration. So, it seems
  that touchpad speed is relative to the total screen layout size in
  each axis. This is quite irritating. It would be more reasonable to
  define speed in absolute terms (pixels/sec) rather than relative terms
  (% x/y resolution / sec), thereby keeping speed in both axes constant,
  regardless of the addition/removal of extra screens.

  I've noticed this on my Thinkpad W510 running Maverick amd64, the
  latest nvidia binary blob, utouch 1.1, synaptics-dkms 1.0.0, and
  xserver-xorg-input-synaptics 1.2.2-2ubuntu5

  Note that external mice don't exhibit this problem. This might be why
  this situation isn't encountered often: when plugged into an external
  monitor, the user is more likely to also plug in an external mouse
  rather than rely on the touchpad.

  This was brought up by Ricardo Caldeira at https://bugs.launchpad.net
  /xorg-driver-synaptics/+bug/308191/comments/187, and Duncan McGreggor
  replied at https://bugs.launchpad.net/xorg-driver-
  synaptics/+bug/308191/comments/189.

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