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[Doug McMahon <1260128@xxxxxxxxxxxxxxxxxx>]

At least here & others confirmed with recent nvidia mobile chips the latest nvidia drivers from the new ppa & an edit to xorg.conf eliminates most tearing (some vids here show a little on occasion
The ppa -  https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa

The additional line added to  /etc/X11/xorg.conf in the Intel device section - 
Option "TearFree" "True"

Ex. here - 
Section "Device"
    Identifier "intel"
    Driver "intel"
    BusID "PCI:0@0:2:0"
    Option "AccelMethod" "SNA"
    Option "TearFree" "True"
EndSection

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Packages, which is subscribed to nvidia-prime in Ubuntu.
https://bugs.launchpad.net/bugs/1260128

Title:
  Nvidia-prime produces unbearable visual stutter

Status in nvidia-graphics-drivers-331 package in Ubuntu:
  Triaged
Status in nvidia-prime package in Ubuntu:
  Triaged

Bug description:
  I've installed NVIDIA-Prime v0.5 on Ubuntu 14.04 with all required
  dependencies, on a Clevo 355STQ with a 765m.

  My issue is that whilst the new switching feature works very well, it
  still produces an extremely noticable amount of visual stuttering. In
  graphical and applications and games I can produce very large frames-
  per-second numbers yet the amount of visual tear makes the program
  unusable. Vsync/Sync to Vblank/vblank_mode=1 also does not work as
  intended, with tearing still present.

  Has anyone else had this issue or found a fix?

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