So 4.4.0-22 has the bug, but 4.4.0-31 does have the bug? From your testing of upstream 4.4.17 in comment #4 this sounds like it is related to an Ubuntu specific SAUCE patch. This would be confirmed by your test results of the -proposed kernel.
We can perform a kernel bisect to identify the commit that introduced this regression. We first need to identify the last good Ubuntu kernel and the first bad one. If -22 is good, we probably want to test 4.4.0-29 next. It can be downloaded from: https://launchpad.net/~canonical-kernel- team/+archive/ubuntu/ppa/+build/10184098 ** Tags added: performing-bisect -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1608236 Title: Regression: S-video output does not work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1608236/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
