On the login screen, click on the gear (cog) icon :)

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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/1802573

Title:
  Thinkpad x220 - Unable to use 2560x1440 external display connected via
  DisplayPort due flashing black screen

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https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1802573/+subscriptions

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