I own a great T420 Thinkpad (Intel HD3000 Graphics) with a dock, and it runs on Lubuntu 16.04. I am currently trying to use it with two external screens via two VGA sockets (one VGA socket from my laptop, the other one from my dock). I do not wish displaying the laptop screen.
Alas, at now, the two external screens are unable to display simultaneously.
When I only plug in the dock VGA cable, everything is fine. xrandr tells me :
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LVDS1 connected
VGA1 connected
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LVDS1 connected [same outputvalues as before]
VGA1 connected [different output values : selected screen definition is same, but other possible screen definitions are different]
Thanks for helping !
elfi