http://bugs.winehq.org/show_bug.cgi?id=31161
--- Comment #5 from Henri Verbeet hverbeet@gmail.com 2012-07-07 10:13:58 CDT --- Created attachment 40909 --> http://bugs.winehq.org/attachment.cgi?id=40909 patch
Actually, you wouldn't get that message for DXTn surfaces, though you might for float textures. Could you see what the attached patch outputs?