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[Stephen Gustafson <sgustafso@xxxxxxxxx>]

nmahale, on further inspection, I think the scrolling problems I was seeing were caused by conflicting services.
The kde touchpad config manages the feature of disabling the touchpad during typing by installing a 'kded' service. This basically consists of a QTImer tied to keyboard events to enable/disable the synaptics touchpad. Meanwhile, syndaemon has a similar feature built in, which is enabled by default (at a 2sec delay). This is why I was still seeing the feature in effect after disabling it in the kde touchpad config dialog.
So, seems likely that there's a conflict between these two daemons. I've encountered no problems since disabling the kded service (relying solely on syndaemon).

However, even if two services were running... it seems like they'd both
operate by trying to enable the touchpad after a fixed interval. There
shouldn't be a problem with two services trying to re-activate the
touchpad at the same time, right? Two services sending an activation
signal at the same time shouldn't cause the activation to be lost. Maybe
there's some problem there worth exploring, but it's undesirable to have
redundant services anyway...

-- 
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 Drivers Ubuntu:
  New
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-graphics-drivers-346 package in Ubuntu:
  New
Status in nvidia-prime package in Ubuntu:
  Confirmed

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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