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[Nicolas F <nvbugs@xxxxxxxxx>]

The bug, for me, is fairly easy to reproduce. The trick is to be actually using the device, by that I mean touchpad, for a while. In fact, I've set up a script to search my xorg log in regular intervals for the messages that occur on VT switches, which I only do when it freezes, and made it send to an IRC channel whenever it happened so my friends could see my suffering. They sarcastically told me that it was a great advertisement for nvidia-powered laptops.
I've also noticed that when I plug in a wacom tablet and use it for a while, and then touch the touchpad again after a bit, it very often leads to a freeze, as if the touchpad was just waiting for me to use it again. Though, this could be entirely psychological. I haven't gathered enough data to conclude it is in any way related.

However, I do have gathered enough data to confidently say it does not occur while the touchpad is not being touched. To show this, I've posted a graph here:
https://devtalk.nvidia.com/default/topic/766166/elantech-touchpad-related-nvidia-driver-freeze/#4278245

To reproduce it, I have a suggestion: Let one of your interns or someone
else play spacechem for a while, with the touchpad. Spacechem includes
enough dragging and dropping for the issue to be triggered. If that
isn't enough, take upon the unpleasanr task of playing first person
shooters on a touchpad.

Another thing I noticed is that kwin uses 100% CPU when I switch from
the frozen X11 to a TTY.

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Packages, which is subscribed to nvidia-prime in Ubuntu.
https://bugs.launchpad.net/bugs/1220426

Title:
  [nvidia-prime]Freeze while using touchpad

Status in “nvidia-graphics-drivers-319” package in Ubuntu:
  Triaged
Status in “nvidia-graphics-drivers-331” package in Ubuntu:
  Triaged
Status in “nvidia-graphics-drivers-343” package in Ubuntu:
  Triaged
Status in “nvidia-prime” package in Ubuntu:
  Triaged

Bug description:
  I'm using an Optimus laptop (Asus N43SL)
  nvidia-prime is installed, so my nvidia dedicated graphics card (GT 540m) is in use.

  Once in a while, my screen will freeze, only when I use my touchpad.
  This does not happen with my USB mouse.
  This does not happen either when I uninstall nvidia-prime and use my intel integrated graphics (HD3000).

  I can temporarily solve the issue by doing a VT switch.

  
  In the attached Xorg.0.log, you can see "synaptics: ETPS/2 Elantech Touchpad: touchpad found" each time I did a VT switch and regained control.

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