Could you try to install the unity and compiz debug symbols (https://wiki.ubuntu.com/DebuggingProgramCrash#Debug_Symbol_Packages), and attach to compiz process from tty1 when you get the hang?
Go Ctrl+Alt+F1, then do something like: sudo gdb -p `pidof compiz` Then inside the gdb session: bt full -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1281806 Title: Alt-Tab switcher regularly goes into "flicker loop of death" or just hangs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1281806/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
