[alsa-devel] Alsa: USB Class 2 Audio soundcard device disappears suddenly

[Daniel Mack]

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in email?

On 31.07.2012 14:04, Joao Bonina wrote:
> You're right about the EMI message, it's happening when the streaming stops.
> 
> I've tried different cables before, but that didn't solve the problem.
> 
> The motherboard is an Alix 1D, and I'm using the onboard USB 2.0 ports.
> 
> If this really is an EMI issue, guess I'll have to source some kind of miniPCI-USB 2.0 card and see if that solves the problem.

Yes, try that. It could still be something else than an EMI issue, but
something makes the hub reset its ports.

Let us know what you find!


Daniel


> ----- Original Message -----
> From: Daniel Mack <zonque at gmail.com>
> To: Joao Bonina <bonina_2001 at yahoo.com>
> Cc: "alsa-devel at alsa-project.org" <alsa-devel at alsa-project.org>; linux-usb <linux-usb at vger.kernel.org>
> Sent: Tuesday, 31 July 2012, 12:38
> Subject: Re: [alsa-devel] Alsa: USB Class 2 Audio soundcard device disappears suddenly
> 
> On 31.07.2012 12:12, Joao Bonina wrote:
>>
>>
>> It doesn't show anything when that happens.
> 
> Well, it shows:
> 
> [  349.789200] hub 1-0:1.0: port 4 disabled by hub (EMI?), re-enabling...
> 
> I guess this about the time when the streaming stops? How does your USB
> wiring setup look like and what kind of system is that? Smells like a
> hardware issue, to be honest. You could do some stress-testing by
> transferring huge amounts of data from one USB storage media to another.
> Also try replacing the cables maybe.
> 
> I'm Cc'ing the linux-usb list, maybe someone there has an idea.
> 
> 
> Daniel
> 
> 
>>
>> Looking at dmesg (I'm attaching it), it shows this:
>> [  350.170478] usb 1-4: config 1 has an invalid interface number: 3 but max is 2
>> [  350.170500] usb 1-4: config 1 has no interface number 2
>> [  350.170843] usb 1-4: config 1 has an invalid interface number: 3 but max is 2
>> [  350.170864] usb 1-4: config 1 has no interface number 2
>> [  350.171344] usb 1-4: New USB device found, idVendor=21b4, idProduct=0230
>>
>> [  350.171366] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
>> [  350.171385] usb 1-4: Product: Ayre USB Interface
>> [  350.171401] usb 1-4: Manufacturer: Ayre Acoustics
>> [  350.171418] usb 1-4: SerialNumber: (C) 2010 XMOS/Wavelength Audio
>>
>>
>> Don't know if those 'invalid interface number' messages are relevant for the issue.
>>
>> Joao
>>
>>
>> ----- Original Message -----
>> From: Daniel Mack <zonque at gmail.com>
>> To: Joao Bonina <bonina_2001 at yahoo.com>
>> Cc: "alsa-devel at alsa-project.org" <alsa-devel at alsa-project.org>
>> Sent: Tuesday, 31 July 2012, 6:24
>> Subject: Re: [alsa-devel] Alsa: USB Class 2 Audio soundcard device disappears suddenly
>>
>> On 31.07.2012 00:32, Joao Bonina wrote:
>>> Hi,
>>>
>>> I'm using an USB Class 2 Audio DAC (basically a soundcard) with my Linux box and MPD software.
>>>
>>> It works great when playing files stored in a remote share, but when 
>>> playing files from an USB pen, it stops playing in a few minutes.
>>>
>>> Mpd.log shows this:
>>>
>>> Code:
>>> Jul 30 13:03 : output: "USB" [alsa] failed to play: No such device
>>> Jul 30 13:03 : output: closed plugin=alsa name="USB"
>>> ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
>>> Jul 30 13:03 : output: Failed to open "USB" [alsa]: Failed to open ALSA device "hw:0,0": No such file or directoryIt seems to be somewhat related to the USB bus not being able to 
>>> cope with both PCM streaming to the soundcard and reading from the flash pen simultaneously, I guess.
>>>
>>> So, anybody faced this issue previously and can provide some hints to solve this?
>>>
>>> MPD is 0.17, kernel is 3.2.17, alsa-utils is 1.0.25.
>>
>> Does the kernel log or 'dmesg' show anything weird what that happens?
>>
>>
>> Daniel
>>
> 
> 
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