I've made some progress. By setting up an xorg.conf with a modeline for
the external display, I got graphics on the (lightdm) login screen to
show up on it. But the login input fields weren't on this screen (it was
just the background), so this was further evidence that there's monitor
Further details: mouse cursor is briefly visible just prior to the black
(login) screen. GDM does show up on the display, but in too big a
resolution, so that I only get some of the grey background visible on
screen and still have to log in blindly.
It occurred to me that with lightdm, the
** Attachment added: x-0-greeter.log
https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1254319/+attachment/3915589/+files/x-0-greeter.log
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** Attachment added: x-0.log
https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1254319/+attachment/3915590/+files/x-0.log
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Title:
** Attachment added: Xorg.0.log
https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1254319/+attachment/3915591/+files/Xorg.0.log
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** Attachment added: lightdm.log
https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1254319/+attachment/3915588/+files/lightdm.log
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