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[bob justo <lejustes32@xxxxxxxxxx>]

I am using an ASUS X73S with intel i915 and nvidia GE GT 520M.
kernel 3.16.3 
using the nvidia only with nvidia-prime 
nvidia official drivers 343.22 (the last)
i don't use ubuntu but slackware and i have have also the bug , the freeze happens very often every hours.
 i had seen the trick suggested in post #18 works ! it's a good workout!
even if i lost the "two fingers" tracking , it's better than the CTRL + ALT+ F1 trick.
and i can work all day long without be annoyed.

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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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