Can you please boot with drm.debug=0xe added to the kernel command line,
and attach the dmesg as well as /var/log/Xorg.0.log?

** Changed in: linux-lts-raring (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1187145

Title:
  [Lenovo X230i]: No display on second screen through Display Port

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