This bug is related to the intel graphics driver, which is used by compiz. However is not a compiz as I managed to crash xorg in a XFCE session as well while watching a movie with VLC.
Disabling compiz windows animations helps as workaround for this bug while opening new windows/menus, but does not fix the bug itself as any other app using accelerated graphics can make xorg to crash. ** Changed in: compiz (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1509846 Title: lightdm crashes on window open in Ubuntu 15.10 intel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1509846/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs