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I upgraded to Ubuntu Trusty Tahr . Currently running with updates as of 6th Feb. 64bit. 
After installing nvidia-prime and nvidia-331, i can see frequent mouse freezes. Once the mouse is frozen, it doesn't allow Alt+Tab functionality. Only way to get out of this is by pressing Ctrl+Alt+F1 . I can bring back by unloading and loading the psmouse module

modprobe -r psmouse.

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 18)
01:00.0 VGA compatible controller: NVIDIA Corporation GT218M [GeForce 310M] (rev a2)


uname -a
Linux Vostro-3300 3.13.0-6-generic #23-Ubuntu SMP Thu Jan 30 09:48:03 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu Trusty Tahr (development branch)"

This issue does not occur while running the opensource driver.

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete

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nvidia prime causing mouse and screen to freeze
https://bugs.launchpad.net/bugs/1277245
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