Comment 12 for bug 929635

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madbiologist (me-again) wrote : Re: [snb-m-gt2] Blank screen after login or after connecting second monitor

There was a fix for a similar (same?) problem on this hardware in the upstream 3.5 kernel, which is available in Ubuntu 12.10 "Quantal Quetzal". I also recall seeing a more recent fix for large displays in one of the 3.6-rc's upstream, so you might want to also try the 3.6.1 kernel available at http://kernel.ubuntu.com/~kernel-ppa/mainline/
Instructions oh how to install and remove the mainline kernels are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds