The Acer Extensa 5630Z is also affected by this bug. The
i915.powersave=0 workaround solves the problem.
VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller [8086:2a42] (rev 07)
Subsystem: Acer Incorporated [ALI] Device [1025:013c]
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[gm45] Irregular sync flashes with compiz on (Lenovo T500)
https://bugs.launchpad.net/bugs/538648
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