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

[edio]

Hi, Conrad.

My regular E-MU 0404 has been configured as Analog Stereo Output for 
ages. When I received white edition, I plugged it in, and didn't bother 
to configure anything (I don't even remember why do I have Analog Stereo 
Output in the first place, I'd say it's a happy coincidence). So the 
only difference between white and regular on my system was the profile 
they were configured with. I explicitly tested regular E-MU 0404 just 
now, and autoswitching does not work if device is configured as Analog 
Stereo Duplex.

Now, another riddle:

* archlinux-arm on rPi3 | Analog Stereo Output: works
* archlinux-arm on rPi3 | Analog Stereo Duplex: **doesn't work**
* archlinux on amd64: works in both cases

So this limits the problem to my Raspberry Pi, which I use as a shared 
sound server.

I played with modules loaded on my rPi. Namely, I tried disabling 
native-tcp and zeroconf-publish modules (I thought maybe some device on 
the network captures the card inputs and thus locks the sampling 
frequency), but results are the same: autoswitching works only with 
Analog Stereo Output profile.

Let me know if you are curious to try anything else on my setup, I'd be 
happy to share results.

On 4/23/19 12:01 AM, Conrad Jones wrote:
> 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 
> <mailto: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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