This seems to be fixed, indeed. I can't reproduce this issue anymore. I'm currently on kernel version 4.4.0-38. I'm marking this as fixed, then.
** Changed in: linux (Ubuntu) Status: Incomplete => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1585329 Title: Sometimes a black rectangle appears briefly under the mouse cursor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1585329/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs