http://bugs.winehq.org/show_bug.cgi?id=9814
--- Comment #5 from Chase Venters chase.venters@gmail.com 2007-09-28 19:53:28 --- Switched to ALSA, and noticed I'm getting the same xcb assertion on the latest git now. I solved the problem by rebuilding libxcb with the NDEBUG preprocessor define as advised for xcb problems with other applications.
It appears that WINE, or perhaps some other library this WINE/Steam/TF2 application combo depends on, is misusing xlib locking. Do you agree? Should I open a new bug, or perhaps change this one?