A quick look in Xorg.0.log suggests it's Cirrus.  The log's attached.

** Attachment added: "Xorg.0.log from the KVM virtual machine"
   http://launchpadlibrarian.net/38804936/Xorg.0.log

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Quadrapassel display corrupted (black and white vertical stripes)
https://bugs.launchpad.net/bugs/508524
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