wine users - May 2010 - Portal sound doesn't work

I recently downloaded Steam and installed the game Portal, but the sound does
not work in the game. Sound does sometimes work at startup and at the game menu,
but never in the game itself. Can anyone think of a solution to this problem.

Specs: 
Ubuntu 10.04
Wine 1.1.42
AMD Athlon X2
Nvidia graphics card

Try to use OSS instead ALSA in Wineconfig. This solved the problem for me.