http://bugs.winehq.org/show_bug.cgi?id=1347
--- Comment #16 from Lei Zhang thestig@google.com 2008-03-14 23:00:45 --- I'm not familiar with the code, but the screen blanking happens in:
BitBlt() called by x11_copy_to_screen() called by IWineGDISurfaceImpl_UnlockRect() called by IDirectDrawSurfaceImpl_Unlock()