http://bugs.winehq.org/show_bug.cgi?id=26798
--- Comment #3 from Henri Verbeet hverbeet@gmail.com 2011-12-18 10:02:39 CST --- (In reply to comment #2)
backbuffer works well, except for the "picture in picture in picture ..." at the lower left mentioned in bug #22029, comment #4. Probably I should submit a distinct issue about that backbuffer artefact?
In principle, yes. It's somewhat of a fundamental problem with the way backbuffer ORM works though, and has been present in some form pretty much since the start. It's possible to fix, but not entirely trivial, and I'm not sure that there's anyone that cares enough about backbuffer ORM to fix anything but regressions.