Same problem here, I'm using a LATITUDE E6510, with intel core i5.
With 10.10, I have the "failed to get i915 symbols, graphics turbo disabled." 
message and then a blank screen.
However I  have a weird workaround for that : I noticed that when I plug an 
external screen on the VGA port of my  dock station, the display starts working 
perfectly.
When my laptop goes into sleep mode, I also have that blank screen sometimes, 
and plugging my external screen does the trick.

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[arrandale] Integrated intel graphics GMA HD doesn't work
https://bugs.launchpad.net/bugs/590504
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