http://bugs.winehq.org/show_bug.cgi?id=26835
--- Comment #75 from eurekafag@eureka7.ru 2011-04-23 05:27:59 CDT --- I doubt it's an issue of DirectSound. I have Portal 2 working without issues (sound works, video settings on maximum, got 30+ FPS which is pretty much playable) on Debian Sid with wine 1.3.18 built by myself (repo's one is very old). NVIDIA GF 8600 GTS, drivers are 270.30. Recently an update of Portal 2 Steam version was released and they say they fixed some error handling and renderer crashes but this bug was not resolved though. I still have to use the skidrow crack to launch and play the game.
So, here we need confirmation from windows users. Does that Valve update fixed things for you?