Comment 6 for bug 979748

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Chris Wilson (ickle) wrote : Re: [expected] VGA monitor only gets signal on boot (no “hot plugging”, no EDID)

Hmm, if the display is being recognised by the display manager and we don't successfully turn it on, then that is a serious issue. After it gets into the "no signal" state, can you please attach the output of xrandr --verbose. It could either be that the modeline is incompatible, or that we are not programming the CRTC correctly. For the latter, grabbing intel-gpu-tools and attaching the output of intel_reg_dumper would be useful.

Also please make sure you have all the updates available (I would like if you could use xorg-edgers or raring), and attach your Xorg.0.log after it exhibits the failure.