http://bugs.winehq.org/show_bug.cgi?id=14038
--- Comment #6 from Tobias Jakobi liquid.acid@gmx.net 2008-07-08 16:58:10 --- I noticed a similar problem when playing Half-Life 2.
During the intro sequence where the gman talks to you I don't see thing, it's simply a flickering solid color screen.
As soon as this sequence ends and you sort of "wake up" in the train the graphics work again. I tried this both with backbuffer and fbo ORM, neither of them works. So HL2 probably triggers the same problem like MP2 with "postprocessing" set to high.
Cheers, Tobias