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     snd_es137x -- Ensoniq AudioPCI ES137x bridge device driver


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

           device sound
           device snd_es137x

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



     The snd_es137x bridge driver allows the generic audio driver sound(4) to
     attach to the Ensoniq 137x audio cards.

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

           hw.snd.pcm%d.latency_timer  Controls the PCI latency timer setting.
                                       Increasing this value will solve most
                                       popping and crackling issues
                                       (especially on VIA motherboards).

           hw.snd.pcm%d.spdif_enabled  Enables S/PDIF output on the primary
                                       playback channel.  This sysctl(8)
                                       variable is available only if the
                                       device is known to support S/PDIF

           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.


     The snd_es137x driver supports the following sound cards:

     +o   Creative CT5880-A
     +o   Creative CT5880-C
     +o   Creative CT5880-D
     +o   Creative CT5880-E
     +o   Creative SB AudioPCI CT4730
     +o   Ensoniq AudioPCI ES1370
     +o   Ensoniq AudioPCI ES1371-A
     +o   Ensoniq AudioPCI ES1371-B
     +o   Ensoniq AudioPCI ES1373-A
     +o   Ensoniq AudioPCI ES1373-B
     +o   Ensoniq AudioPCI ES1373-8




     The snd_es137x device driver first appeared in FreeBSD 4.0.


     Russell Cattelan <>
     Cameron Grant <>
     Joachim Kuebart
     Jonathan Noack <>