Attempted to upgrade to 38-13 this morning.  It still doesn't work.
Interestingly, it is broken in a slightly different way than 38-12 was
broken.  Instead of flickering, as it did under 38-12, the external
monitor puts up a floating box that says something like: "Not optimum
mode.  Optimum mode is 1920x1200."  That's all I can get out of it.

I uninstalled 38-13 and went back to 38-11, which still works.  (Had to
run update-grub.  No problem.)

FYI, I installed Kubuntu on an external disk and ran it on the same
Lenovo X-220-based workstation that's having all these problems with
flickering external monitor since 38-12 came out.  No problem!  (Well,
no problem except for the fragility of some of KDE4's tools.  We can
live with that.)

Go figure.  I don't get it.  Is all this flickering in versions after
38-11 really an old-Gnome problem?

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https://bugs.launchpad.net/bugs/882225

Title:
  external monitor no longer works

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