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[Tim Banchi <tim.banchi@xxxxxxxxx>]

a short update:
I found out that it has nothing to do with whether the second mouse is connected to the PS/2 port or the serial port. 
The mouse jumping also happens when connected to the serial port.

Because the other PS/2 mouse never showed any of these problems I guess
the culprit is the Logitech Trackman Live (or the receiver of it).
However this problem did not occur in Windows, so it might as well be a
combination of the specific hardware (Trackman Live,  PD01X docking
station) with the driver.

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https://bugs.launchpad.net/bugs/1363070

Title:
  USB Mouse cursor jumps and buttons get deactivated with two PS/2
  devices connected

Status in xorg package in Ubuntu:
  Expired

Bug description:
  This happens when two PS/2 devices are connected at the same time and a USB mouse is primarily used (eg using a Laptop with a PS/2 touchpad with an external USB mouse)
  Symptoms: after a while (can be 10 minutes or 1 hour) the mouse cursor starts randomly to jump (mostly down) and up and then the mouse buttons get deactivated (clicking does not have any effect). In that case, moving the mouse marks the underlying text (thus imitating a continuous left-click). This malbehaviour can be temporarily stopped when shortly using one PS/2 device. After a while the same symptoms reappear.

  Setup:
  Dell D430 docked to a Dell D/dock PD01x. The second PS/2 device is an (switched off) Logitech TrackMan Live! (infrared mouse connected via a PS/2 receiver). 
  This bug appears under 12.04 LTS Unity and 14.04 with Xfce, KDE or Unity (always using the latest kernels). Using KDE the bug appears more often than when using XFCE.

  To resolve the issue:
  disconnect the external Trackman Live PS/2 device from the docking station.

  This bug drove me crazy. Only by accident I disconnected the Trackman
  and since then my USB mouse works well again. I verified that the bug
  reappears as soon as I connect the TrackMan again and I used different
  USB mice (as I thought that it might be a USB problem). It did not
  happen under Windows, so it is not hardware related.

  If this bug is going to be followed up I can test with a normal PS/2
  mouse (instead of the TrackMan Live) if the same bug happens or would
  be happy to provide logging data.

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