NAME

     snd_via8233 — VIA Technologies VT8233 bridge device driver

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device sound
           device snd_via8233

     Alternatively, to load the driver as a module at boot time, place the following line in
     loader.conf(5):

           snd_via8233_load="YES"

DESCRIPTION

     The snd_via8233 bridge driver allows the generic audio driver, sound(4), to attach to the
     VIA VT8233 audio devices.  These audio chipsets are integrated in the southbridge on many
     VIA based motherboards.

   Runtime Configuration
     The following sysctl(8) variables are available in addition to those available to all
     sound(4) devices:

           dev.pcm.%d.polling  Experimental polling mode, where the driver operates by querying
                               the device state on each tick using callout(9).  Polling is
                               disabled by default.  Do not enable it unless you are facing weird
                               interrupt problems or if the device cannot generate interrupts at
                               all.

HARDWARE

     The snd_via8233 driver supports the following audio chipsets:

     •   VIA VT8233
     •   VIA VT8233A
     •   VIA VT8233C
     •   VIA VT8235
     •   VIA VT8237
     •   VIA VT8251

SEE ALSO

     sound(4)

HISTORY

     The snd_via8233 device driver first appeared in FreeBSD 4.7.

AUTHORS

     This manual page was written by Joel Dahl <joel@FreeBSD.org>.

BUGS

     The snd_via8233 driver does not support S/PDIF.  There is partial support in the code, so
     implementing it should be fairly easy if the right hardware is available.