Just updated from 16.04 to 16.10 in the silent hope it fixes this
problem - unfortunately it got worse:
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
[Lenovo ThinkPad W530] Regression: cannot set up 3 display
configuration any more (Optimus)
To manage notifications about this bug go to:
ubuntu-bugs mailing list