I installed linux 4.4.0-23.41 from yakkety-proposed, and that fixed the issue.
Fortunately I didn't meet the problem on xenial; the problem was linux 4.4.0-22 on Ubuntu 16.10, but since it's fixed in -proposed, it will soon be history, right? (don't know how to use apport-collect in a situation like this) ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed ** No longer affects: linux (Ubuntu Xenial) ** No longer affects: unity (Ubuntu Xenial) ** Tags removed: xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1584106 Title: Login to Unity session fails with linux 4.4.0-22 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1584106/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs