Comment 4 for bug 521260

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Pauli (paniemin) wrote :

Please try daily mainline-ppa https://wiki.ubuntu.com/KernelTeam/MainlineBuilds and you will need a special firmware http://xorg.freedesktop.org/wiki/radeonBuildHowTo#TroubleshootingExtraFirmwareforR600.2BAC8-R700

This sounds like null pointer deference in init failure path that was fixed in 2.6.33-rc7 or rc8. Also firmware loading problem might be fixed in newer kernel.