I notice there is a typo in your xorg.conf:
Option "metamodes" "CRT-0: 1680x1050
You're missing quotes.
Also, you should include an explanation in your bug report why you're
using an xorg.conf, since for this hardware you typically shouldn't need
to use an xorg.conf except in specific circumstances.
Do a 'tail -f /var/log/Xorg.0.log' and check if the file grows each time
the screen blanks.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/681054
Title:
screen repeatedly goes black for a fraction of a second
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