Please try booting wtih "i915.powersave=0":
gksudo gedit /etc/default/grub
Add "i915.powersave=0" to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
so it reads
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.powersave=0"
Save and exit, and then run "sudo update-grub" in a terminal. Then reboot.

** Summary changed:

- Screen blacks out for a second occasionally
+ [gm45] Screen blacks out for a second occasionally

** Tags added: flicker gm45

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[gm45] Screen blacks out for a second occasionally
https://bugs.launchpad.net/bugs/583494
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