I'm attaching a more detailed kernel log (using drm.debug=999 at boot)
of what's happening when using xrandr, in case it could be useful.
** Attachment added: "detailed-kernel-log.txt"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/946311/+attachment/3065143/+files/det
Same problem here: can't display both on the laptop screen and on an external
monitor. Laptop screen alone is ok; when plugging the external monitor with
VGA, I can only use that external monitor.
It used to work. Dell Latitude E5410, i915 driver.
There are quite a lot of this in Xorg.0.log:
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