I experiense the same problem on my Asus X5dij laptop, which has also an 
integreted Intel 4 Series Express Video Card(Intel GMA 4500M) and Intel GL40 
Chipset.
My whole screen flickers. It is really unpleasent for my eyes. I can see the 
horizontal refresh lines. So I've tried to create a xorg.conf and to add a 
Modeline, as I believed that the problem is due to wrong Horizontal sync value. 
But I had no success and the problem still exists. 
I have also tried the kernel from the Comment #88 and to use i915.powersave=0, 
but neither solution was successful. 
I hope that someone will find a solution to this problem.
Thanks.

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[Intel GM45] Irregular sync flashes on 8086:2a42 (Needs i915.powersave quirk)
https://bugs.launchpad.net/bugs/538648
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