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Thanks a lot for your post. I am also trying to build a similar configuration using rMBP (early 2015) + GTX 1070 + AKitio Thunder2 + Internal display + Ubuntu 16.04. It would be very helpful if you could detail out the complete setup process. Thank you very much for your help.

Hello. I am trying to setup this configuration but I am not very sure about the internal display working on Ubuntu. Although the wiki page for optimus mentions that this technology works for Windows and Linux. But I am yet to find any implemention of this setup. Would welcome your valuable suggestions.