> attached are the config descriptors and the device dump of two uaudio
> devices. Both exhibit distorted audio output. It sounds a little bit
> like clipping / not feeding enough samples fast enough...
> I played around with dev.pcm.2.bitperfect=1, dev.pcm.2.play.vchans=0,
> dev.pcm.2.play.vchanrate and hw.snd.latency=1...10.
> At some point vchanrate doesn't work anymore, it always stays at 4.0
> audio, even when trying to go back to 2.0. I have to usbconfig reset the
> Sometimes (rarely) when playing around I get clear audio output, but
> when I try to reproduce it (going back to default value for the last
> sysctl setting and then going back again to the same setting again), the
> audio is distorted again.
> To me it sounds like some kind of buffer is not big enough or the data
> is not delivered fast enough to the uaudio device. But this is a
> dual-socket system with:
> CPU: Intel(R) Xeon(R) CPU E5620 @ 2.40GHz (2133.36-MHz
> K8-class CPU)
> FreeBSD/SMP: Multiprocessor System Detected: 16 CPUs
> FreeBSD/SMP: 2 package(s) x 4 core(s) x 2 hardware threads
> And while playing around with uaudio the system has a load of around 1,
> so I would expect CPU/RAM is not an issue here.
What version of FreeBSD is this?
Try to enable hw.usb.uaudio.debug=16 during playback.
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