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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



     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 output.

           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:

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




     The snd_es137x device driver first appeared in FreeBSD 4.0.


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