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. ** Bug watch added: Linux Kernel Bug Tracker #16496 http://bugzilla.kernel.org/show_bug.cgi?id=16496 -- [arrandale] VGA port not working on Dell Latitude E6510 https://bugs.launchpad.net/bugs/607783 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs