The sound system lacks support for the SNDCTL_DSP_SETDUPLEX ioctl, I think because it will do full duplex all of the time. This causes a problem with at least one Linux app (TeamSpeak2) as it tries this ioctl, and it fails so it thinks you can't do full duplex audio. Fix: Apply this patch http://www.gsoft.com.au/~doconnor/snd-duplex-patch.txt and then rebuld sound and linux kld's, reinstall and reboot, and now TS works. How-To-Repeat: Install TeamSpeak and watch how you are muted :)
Responsible Changed From-To: freebsd-bugs->emulation One for emulation
State Changed From-To: open->patched Patched in rev 1.120 of linux_ioctl.c
State Changed From-To: patched->closed Committed July 2004 and unlikely to be MFCed any further than that.