Ubuntu 12.04 64-bit
kernel 3.2.0-25-generic
graphics - NVidia

My laptop constantly freezes as it outputs the last sound produces for example 
with no keyboard or mouse support. This is the 1st case when watching movie 
with VLC and opening images or browser in the background. The second one occurs 
while browsing and watching flash video on YouTube - the machine feels like 
working except the display goes black with green horizontal lines with a small 
quadrat in the bottom right side of the screen.
In those 2 cases only hard restart helps problem to get solved.

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https://bugs.launchpad.net/bugs/993187

Title:
  ubuntu 12.04 completely freezes frequently.

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