Christopher, I have finished the bisection (man, that took a long time!) and I have attached the output.
The summary is that commit 4efa83c8c786ab7ec7982e3dd348cb7e7ecbeb04 is the one that fixes things. This makes sense because I am attaching my external monitor via a DP->VGA dongle, mentioned in the description. So, what next? Thanks again for your assistance. David ** Attachment added: "Output from git bisect for the first bad commit." https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1520751/+attachment/4535138/+files/badcommit.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1520751 Title: Kernel 4.2 does not detect external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1520751/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
