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[Nikhil Mahale <nmahale@xxxxxxxxxx>]

Thanks Stephen for clarification.
I have sent patch for review on xorg-devel, let's see when that is getting merged with main-line.

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

Title:
  [nvidia-prime]Freeze while using touchpad

Status in NVIDIA Drivers Ubuntu:
  New
Status in X.Org X server:
  Confirmed
Status in nvidia-graphics-drivers-319 package in Ubuntu:
  Invalid
Status in nvidia-graphics-drivers-331 package in Ubuntu:
  Invalid
Status in nvidia-graphics-drivers-343 package in Ubuntu:
  Invalid
Status in nvidia-graphics-drivers-346 package in Ubuntu:
  Confirmed
Status in nvidia-prime package in Ubuntu:
  Confirmed

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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