Comment 26 for bug 607783

I finally got it working :-)
The latest drm-intel-next kernel does solve the issue, but some patch caused the regression which gave me the blank screen on boot. I reverted that patch (see https://bugzilla.kernel.org/show_bug.cgi?id=16496) and compiled the kernel myself. Now I can use my external monitor. The screen gets scrambled for a split second when I open the monitors dialogue, but then I get a fully functional dual-head setup. The only problem is that the option "same image in all monitors" is greyed out, but that issue is probably independent from this one.

I don't know which patch solved the issue, but I'm very happy with it.