Hi Raja, 
You don't actually need to click or tap the touchpad. Just use it like you 
would do in normal use.
After a random amount of time (30 sec to 3 hours or more), it WILL hang, i can 
assure you. Freeze will happen while you move your finger on the touchpad.
This is hard to reproduce in a lab because the amount of time is random, and it 
can take a very long time. But it will. That's why only people who actually use 
nvidia-prime on a daily basis see this bug.
The only known way to reproduce this bug :
1) don't try to make it happen
2) use your computer's touchpad in normal conditions : working on something 
else, web browsing...
3) it will hang.

-- 
You received this bug notification because you are a member of Desktop
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-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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-319/+bug/1220426/+subscriptions

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