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On 2014-11-14T17:52:32+00:00 Nikhil Mahale wrote:

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

This bug is root caused in xorg-server os layer, attaching patch to fix
it and sending it to xorg-devel list.

Reply at: https://bugs.launchpad.net/ubuntu/+source/nvidia-
prime/+bug/1220426/comments/180

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On 2014-11-14T18:24:06+00:00 Nikhil Mahale wrote:

Created attachment 109479
[PATCH] os: Fix timer race conditions

Reply at: https://bugs.launchpad.net/ubuntu/+source/nvidia-
prime/+bug/1220426/comments/181


** Changed in: xorg-server
       Status: Unknown => Confirmed

** Changed in: xorg-server
   Importance: Unknown => Critical

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

Title:
  [nvidia-prime]Freeze while using touchpad

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-prime” package in Ubuntu:
  Invalid

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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