I have an X230T with the UltraBase 3 dock.  The problem is reproduced
exactly for me, that ...

>  If I suspend the laptop when it is docked and resume after undocking
it, the screen stay blank.

I can also verify the ....

> WORKAROUND: If I remove the DVD reader from the docking station, then
the issue is solved.

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https://bugs.launchpad.net/bugs/1258838

Title:
  [Lenovo ThinkPad X230] suspend/resume failure

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