I noticed I was getting mono sound in Killing Floor; I'm using onboard audio with 7.1 speakers connected and 7.1 set in the system audio config. I'm using Ubuntu 12.10 and in the system audio test each speaker works properly/individually and Amnesia also properly/discretely outputs surround sound. KF, however, only outputs mono sound. I'm guessing that the included libopenal.so is shoddy so you'll want to symlink to the library in the /usr/lib directory to get discrete surround working properly in KF.
Navigate to Steam/SteamApps/common/KillingFloor/System
Backup the original file (optional): mv openal.so openal.so.bak
Create a symlink to the current libopenal: ln -s /usr/lib/i386-linux-gnu/libopenal.so.1 openal.so
This bug was closed because the issue concerns the game and not the Steam client. Please contact the game developer on their official website with this information.
Copied from the forum, users have issues with the bundled library, after replacing with system lib, surround sound returns. http://steamcommunity.com/app/221410/discussions/3/846939071079099941/ & http://steamcommunity.com/app/221410/discussions/0/846938350728378133/
I noticed I was getting mono sound in Killing Floor; I'm using onboard audio with 7.1 speakers connected and 7.1 set in the system audio config. I'm using Ubuntu 12.10 and in the system audio test each speaker works properly/individually and Amnesia also properly/discretely outputs surround sound. KF, however, only outputs mono sound. I'm guessing that the included libopenal.so is shoddy so you'll want to symlink to the library in the /usr/lib directory to get discrete surround working properly in KF.