http://bugs.winehq.org/show_bug.cgi?id=27264
--- Comment #9 from Stefan Dösinger stefandoesinger@gmx.at 2011-05-25 17:00:52 CDT --- the easiest way is to add some statement like
ERR("zbias set to %u\n", Value);
In the case block that handles D3DRS_ZBIAS.