Could you also try adding “i915.powersave=0” to the kernel boot line, as
in bug #538648? I think this is probably a duplicate.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Fix Released => Incomplete
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[gm45] Glitches appears sometimes on screen. Intel GMA 4500MHD
https://bugs.launchpad.net/bugs/555350
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