What do you mean by "there is no proprietary driver available"? The
nvidia driver in 11.10 should support it.
That said, I can try nouveau on my t420s, should be the same chip.
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/875309
Title:
[Thinkpad T420] External video inoperative with Noveau
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