[pulseaudio-discuss] Frequency autoswitching with E-MU 0404 USB

[Conrad Jones]

This is interesting, are you requiring to switch the profile only on the
white edition ?

I ask because I have a box full of these in storage, it would be
interesting if there is a difference if there is different firmware at play
on the device

On Mon, Apr 22, 2019 at 11:46 PM edio <edio at archlinux.us> wrote:

> I was looking for clues here and there, until I stumbled on this gist:
>
> https://github.com/taravasya/taravasya_snips/commit/a99bc93365aafbdc8a735fe24a9f4107f857144e#diff-e2c3b1bfad69cc1fb921d18bdb7c2bd5
>
> That gave me an idea, that perhaps switching profile from Duplex to
> Output would solve my issue.
>
> Indeed it did! I switched profile to Analog Stereo Output (instead of
> Duplex) and frequency autoswitching started working.
>
> Would you consider this a bug either in PulseAudio or Linux kernel?
>
> Thanks
>
> On 4/22/19 12:07 PM, edio wrote:
> > Hello,
> > I'm having trouble with sampling frequency autoswitching when using
> > E-MU 0404 USB soundcard.
> >
> > This case is rather strange.
> >
> > I have 2 E-MU 0404 USB soundcards: regular one (model EM8761) and
> > white edition (model EM8762).
> >
> > Autoswitching in PulseAudio works with the regular one but not with
> > the white edition. However in ALSA both sound cards work as expected.
> >
> > Here's dmesg output when I connect both:
> >
> > ----
> > [  842.304339] usb 1-1.2: new high-speed USB device number 6 using dwc2
> > [  842.446437] usb 1-1.2: New USB device found, idVendor=041e,
> > idProduct=3f04, bcdDevice= 1.00
> > [  842.466211] usb 1-1.2: New USB device strings: Mfr=1, Product=2,
> > SerialNumber=3
> > [  842.479357] usb 1-1.2: Product: E-MU 0404 | USB
> > [  842.489520] usb 1-1.2: Manufacturer: E-MU Systems, Inc.
> > [  842.500246] usb 1-1.2: SerialNumber:
> > E-MU-09-3F04-07D90916-0914D-8761T2A
> > ...
> > [  901.444396] usb 1-1.2: new high-speed USB device number 7 using dwc2
> > [  901.586367] usb 1-1.2: New USB device found, idVendor=041e,
> > idProduct=3f04, bcdDevice= 1.00
> > [  901.603744] usb 1-1.2: New USB device strings: Mfr=1, Product=2,
> > SerialNumber=3
> > [  901.616060] usb 1-1.2: Product: E-MU 0404 | USB
> > [  901.625459] usb 1-1.2: Manufacturer: E-MU Systems, Inc.
> > [  901.635506] usb 1-1.2: SerialNumber:
> > E-MU-43-3F04-07D70109-0964D-STATION 01
> > ----
> >
> > From this both seem to be the same: vendor and product IDs are the
> > same. Yet somehow, PulseAudio works differently for them. Is there
> > maybe some sound card specific code in PulseAudio?
> >
> > Would appreciate any hints and suggestions on how to debug the issue.
> >
> > Thanks
> >
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