http://bugs.winehq.org/show_bug.cgi?id=13636
--- Comment #6 from Roderick Colenbrander thunderbird2k@gmx.net 2008-06-05 09:47:41 --- Both ATI's fglrx and the open source radeon driver should support it well. (support in the open driver is quite new) The issue is mostly likely the use of plain mesa.