Hi, please try Linux kernel version 4.4.71, 4.8, 4.9 at [1] so I can know the what exact patch series fixed the issue.
My guess is that backported lspcon feature broke some machine. But since 4.10 works, we need to backport more patches to ours 4.4 Linux. [1] http://kernel.ubuntu.com/~kernel-ppa/mainline -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1686189 Title: External monitor connecting problem on Intel graphics card To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1686189/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
