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.

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

Title:
  [nvidia-prime]Freeze while using touchpad

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