Comment 5 for bug 1279422

@Alan, all my testing is on mako. So no mesa backend involved.

@Kevin, that comment about lifecycle message isn't quite what I think I'm seeing. Because my use case is loading a new greeter session (not an app client of unity-mir, but a whole new unity-mir instance).

I need to do a combination of further investigation into what's happening under the covers in my use case and grokking the multiple ways I'm hearing that Mir freezes apps (via buffers and via messages).