I've tried linux-next today (4.6.0-rc3-next-20160412) as I've read there are quite some intel driver changes there and this issue with freezing is gone. I can now log-in with monitor attached and everything still works. The message that we posted here still appears thus confirming what Matt said in comment 35 that it doesn't have a thing to do with our reported problems.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1523088 Title: WARN_ON(!wm_changed) warning and stacktrace in kernel log To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/1523088/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
