Comment 3 for bug 1195509

The specific problem here is in unity-system-compositor.log - Mir fails to control the VT and throws an exception:

ERROR: /build/buildd/mir-0.0.5bzr774saucy0/src/server/graphics/gbm/linux_virtual_terminal.cpp(137): Throw in function virtual void mir::graphics::gbm::LinuxVirtualTerminal::register_switch_handlers(mir::MainLoop&, const std::function<bool()>&, const std::function<bool()>&)
Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >
std::exception::what: Failed to set the current VT mode
[boost::errinfo_errno_*] = 5, "Input/output error"