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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.
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Affects: xorg-server
Importance: Critical
Status: Confirmed
** Tags: patch saucy trusty utopic
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[nvidia-prime]Freeze while using touchpad
https://bugs.launchpad.net/bugs/1220426
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