So I can confirm that adding the extra modeline works, eg I now have
2560x1440@60 Hz both appearing in xrandr and working on the laptop
monitor using the modeset driver.

(There's a separate bug for the modeset driver whereby if you change the
mode, eg from 1920x1080 to 2560x1440, the new screen only uses the top
1920x1080 display space - except, curiously, for the unity launcher and
top bar - but once I restarted lightdm, the new resolution works fine.)

No, I hadn't heard of quilt before. I'll check it out.

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1606103

Title:
  modeset driver is missing some modes that the intel driver (and Mir)
  has

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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1606103/+subscriptions

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