Team Fortress 2 Has no Sound?

$ sudo getsebool selinuxuser_execheap

If this returns selinuxuser_execheap --> disabled you will need to enable the boolean.

This can be done on a temporary basis (only survives until next boot), with:

$ sudo setsebool selinuxuser_execheap 1

Or persistently with:

$ sudo setsebool -P selinuxuser_execheap 1

Setting this boolean does have potential security implications, but they are relatively minor. The safest way to do this, if you wish to use steam is to toggle this boolean on and off as necessary.