http://bugs.winehq.org/show_bug.cgi?id=11203
--- Comment #9 from Stefan Dösinger stefandoesinger@gmx.at 2008-01-16 01:10:32 --- Do you have Windows installed on that machine? Does it offer 32 bpp there?
Maybe we just need a better detection of the real framebuffer depth, and hardcoding 24 -> 32 isn't enough.