I was not able to identify a non-working mainline kernel. Therefore, I do not know what to bisect.
Both mainline 4.2.0-040200 and 4.2.4-040204 which are the mainline builds available for wily closest to 4.2.0-30 work. I suspect, the bug is not present in the mainline kernel at all. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1559580 Title: After upgrading to 4.2.0.30 Elantech touchpad not detected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1559580/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs