ad1848_mute_monitor  150 dev/isa/ad1848.c void	ad1848_mute_monitor(void *, int);
ad1848_mute_monitor 1246 dev/isa/ad1848.c     ad1848_mute_monitor(sc, 1);
ad1848_mute_monitor 1298 dev/isa/ad1848.c     ad1848_mute_monitor(sc, 0);