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[James <jamesrobertmooney@xxxxxxxxx>]

I have the same problem, or, at least, a similar one. My system is: HP
Pavilion dm1 / Ubuntu 14.04.3 LTS / Radeon HD 6320 graphics / PS/2
Synaptics TouchPad.

My touchpad stops working periodically. A display swap (CTRL+ALT+f1
etc.) *sometimes* solves the problem, but I'm also finding that
sometimes my keyboard stops working at the same time - which of course
means that I can't swap displays using the keyboard. The problem does
seem to be solved by connecting a USB mouse and a USB keyboard - but as
it's a laptop I can't always do that.

I have tried the solution suggested at post #18. This worked very
briefly, but before long the touchpad and (non-USB) keyboard stopped
working again.

I have briefly looked at the solution suggested at post #251. Pardon my
ignorance as a relative novice, but do I need to compile the package at
https://launchpad.net/~snafu109/+archive/ubuntu/xorg-server ? I've added
the PPA address as instructed, but I'm guessing that's not all I need to
do?

If someone could help with this I'd be very grateful.

-- 
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https://bugs.launchpad.net/bugs/1220426

Title:
  [nvidia-prime]Freeze while using touchpad

Status in X.Org X server:
  Fix Released
Status in xorg-server package in Ubuntu:
  Fix Released
Status in xorg-server source package in Trusty:
  Triaged

Bug description:
  Using Asus N43SL laptop as an example, with nvidia-prime installed, so
  the dedicated NVIDIA graphics card (GT 540m) is in use, once in a
  while, my screen will freeze when I use my touchpad.

  WORKAROUND: Use USB mouse.

  WORKAROUND: Uninstall nvidia-prime and use integrated graphics.

  WORKAROUND: Do a VT switch via Ctrl+Alt+F1 then Ctrl+Alt+F7.

  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:
  https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1220426/+attachment/3801516/+files/Xorg.0.log

  The following upstream report has a patch that addresses this issue:
  https://bugs.freedesktop.org/show_bug.cgi?id=86288

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