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[Santiago Gala <sgala@xxxxxxxxxx>]

I'm seeing this very same bug on a fresh install on a Asus A53J, quite
similar hardware (Elantech, NVIDIA Corporation GF119M [GeForce GT 520M]
(rev a1))

Any possibility to have it solved without loosing features? It is very
annoying see the touchpad freeze every few minutes. Removing the option
to "deactivate while typing" reduces the freeze frequency, but I NEED
the two finger scrolling for productivity, and this one makes it freeze
less often, but still enough...

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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 xorg-server package in Ubuntu:
  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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