As it turned out, the leftern part of the right screen is already part of the right screen (not a overstretched part of the left screen.
To illustrate it, I marked it red on a photo (attached). Still: 80% of the second screen remain black, as long as the login process is not finished. ** Attachment added: "CIMG1106.JPG" https://bugs.launchpad.net/ubuntu/+source/gnome-flashback/+bug/1665853/+attachment/4821337/+files/CIMG1106.JPG -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1665853 Title: Gnome Flashback: Could not assign CRTC to outputs, ignoring configuration To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-flashback/+bug/1665853/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs