Christian, thank you very much for your help. Here is the info you've
requested:

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
X555LN.311
04/10/2015

I've updated BIOS, and was able to successfully change display position
using System Settings / Display (I had to press Detect Displays for that
to work).

However, after I logged out from Unity, I was not able to log back ---
Unity now crashes back to the login screen.

I will try running xrandr and report results in the next comment.

** Changed in: xorg (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1512672

Title:
  Xorg crash

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