http://bugs.winehq.org/show_bug.cgi?id=31406
--- Comment #26 from Rico kgbricola@web.de 2012-09-09 02:57:36 CDT --- Well mesa on R600 uses libx11 which uses libxcb, that's why it may hang for me and my test case. Probably nvidia uses it in another way.
The attached patch doesn't fix my issue (so it might not have the same source).
Commit 5ceeaaa4294201b3f613c07f9ec610c0e5f673c7 is prior libxcb 1.8. John / Benn / DL what's your libxcb and libX11 version?