Portal 2 always resets audo to 5.1

[mtmkls]

Your system information

• Steam client version (build number or date): Jul 17 2017
• Distribution (e.g. Ubuntu): Debian
• Opted into Steam client beta?: [Yes/No] No
• Have you checked for system updates?: [Yes/No] No

Please describe your issue in as much detail as possible:

I expected it to remember my audio setup.

Steps for reproducing this issue:

1. Have 2 speakers
2. Start the game
3. Don't hear anything that happens behind you

[kisak-valve]

Hello @mtmkls, let's track this issue in the Portal 2 issue tracker at https://github.com/ValveSoftware/portal2/issues/288.