Comment 2 for bug 1173557

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Chris Wilson (ickle) wrote : Re: Problems with dual monitor on Intel HD graphics

It would appear that you have two bugs here and no logs...

When unity becomes unresponsive, switch to a vt and run apport-collect 1173557. However, to help get to the bottom of the bad modesetting we will need drm.debug=6 appended to the kernel commandline - and for you to run a more recent kernel (see ppa:mainline drm-intel-nightly).