Ubuntu used a patch for this, but it's just a work-around for now and multiple upstream's developers told me that is not the right approach to use. -- debbug#555134 ...
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as
ID Status Resolution Sev Product Comp Assignee Reporter Summary
23740 NEW --- nor Branch 5 kernel-m silicium imz blanks the screen in graphics mode "forever" at random moments on intel (i915 driver)