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

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