The workaround (reloading psmouse) apparently solves the problem that
the touchpad (/dev/input/eventX) is grabbed by the wrong XServer:

This can be observed by running:
sudo lsof /dev/input/eventX

First XServer: Touchpad works. (as the devide is grabbed by the process of the 
first XServer.
Switching to second XServer
Second XServer: Touchpad does not work. The device is still grabbed by the 
first Server
sudo rmmod psmouse
sudo modprobe psmouse
Second XServer: Touchpad works. The device is now grabbed by the second Server.

Can anybody explain how the normal procedure of grabbing/releasing of devices 
works?
If i repeat the above test with an USB mouse, this procedure works...

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https://bugs.launchpad.net/bugs/1247388

Title:
  Mouse cursor disapear / mouse stops working, when switching user

Status in “gdm” package in Ubuntu:
  Confirmed

Bug description:
  I have upgraded to Ubuntu 13.10 Gnome3 amd64, from Ubuntu 13.04 x86 where I 
used both Unity, KDE and Gnome, and in the old setup it worked fine.
  Now when I select switch  user , I come out to the login screen and the mouse 
cursor is gone.
  Switching back to the first user the mouse is back.
  If the second user with no cursor runs:
  sudo modprobe -r psmouse
  sudo modprobe pmouse
  the mouse works again, but then  it stops working for the first user.

  It could alse be that the cursor is still ther but it doesn't move.

  I run a Dell laptop with a Synaptics touchpad.

  What can I do to provide more information?

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