1) dmesg | grep -i audio
azalia0 at pci1 dev 0 function 1 "ATI Radeon HD 48xx HD Audio" rev 0x00: apic 4 int 19 (irq 11)
audio0 at azalia0
azalia1 at pci0 dev 20 function 2 "ATI SBx00 HD Audio" rev 0x00: apic 4 int 16 (irq 7)
audio1 at azalia1
2) audioctl | grep -i azal
config=azalia0
3) ls -lh /dev/audio
lrwxr-xr-x 1 root wheel 11B Mar 14 05:44 /dev/audio -> /dev/audio0
4) 用ln 更改,他说不行。rm /dev/audio, ln -s /dev/audio1 /dev/audio,发现可以了,但是audioctl -a | grep -iazal 还是config=azalia0,在改 autdioctl -f /dev/audio1 config=azalia1 他告诉我config 是readonly 郁闷。