Re: FW: Unable to set hw params - protocol error

[noblesavage114 <stusmithe@xxxxxxxxxxx>]

Just wanted to say a big thanks for all the great work you guys do, thanks to Samuel and Clemens too but I've given up on the chinese xmos board. I have a little girl, another on the way and a hectic charity job - and diagnosing the issue with the xmos board has already taken up enough of my time.

Bought an amanero usb i2s board last night as I understand it should just work out of the box under linux with alsa,

cheers 

Stu

---

Date: Thu, 25 Jun 2015 10:34:52 +0200
Subject: Re: FW: Unable to set hw params - protocol error
From: samuel.engelmajer@xxxxxxxxxx
To: stusmithe@xxxxxxxxxxx
CC: alsa-user@xxxxxxxxxxxxxxxxxxxxx

Yes,

this is exactly the kind of traces I was thinking of. It looks like some control isn't supported by the device.

Maybe it need a quirk to work right, or the descriptor and needs fixing ?

I am afraid I can't do much more without the actual device to play with.

Since it works under windows, you can try to look at the window driver's source code and understand how they do it differently.

You can also dump all the usb control messages using wireshark for usb capture - works under both Linux and Windows, and look for differences.

Has any one else ever tried to use this device with Linux ? Maybe some workaround in Alsa is necessary and nobody has done it yet.

 

2015-06-24 23:40 GMT+02:00 noblesavage114 <stusmithe@xxxxxxxxxxx>:

Hi Samuel,

Should I be posting back to the Alsa mailing list? I'm not sure how this works, I ran the command: sudo tail /var/log/kern.log

 the output is below, is this what is needed or do I need more log files?

Jun 23 22:56:50 Server kernel: [  126.014136] usb 1-14: cannot get ctl value: req = 0x81, wValue = 0x101, wIndex = 0xa00, type = 1

Jun 23 22:57:49 Server kernel: [  184.943458] usb 1-14: cannot get ctl value: req = 0x81, wValue = 0x101, wIndex = 0xa00, type = 1

Jun 23 22:57:49 Server kernel: [  184.946336] usb 1-14: cannot get ctl value: req = 0x81, wValue = 0x101, wIndex = 0xa00, type = 1

Jun 23 22:57:49 Server kernel: [  184.955676] usb 1-14: cannot get ctl value: req = 0x81, wValue = 0x101, wIndex = 0xa00, type = 1

Jun 23 23:02:36 Server kernel: [  472.236270] usb 1-14: 1:1: usb_set_interface failed (-71)

Jun 23 23:04:33 Server kernel: [  588.755317] usb 1-14: cannot get ctl value: req = 0x81, wValue = 0x101, wIndex = 0xa00, type = 1

Stu

---

From: stusmithe@xxxxxxxxxxx
To: samuel.engelmajer@xxxxxxxxxx
Subject: RE: [Alsa-user] Unable to set hw params - protocol error
Date: Wed, 24 Jun 2015 13:18:48 +0000

Thank you for the reply Samuel,

I'm on a steep learning curve here and have never used logs with Linux,

Should I type

sudo tail /var/log/messages

after plugging in my usb card?

Will this be the best method to discover if my Kernel was compiled with DEBUG? What should I look for here?

not sure about the kern.log either, what command should I issue?

any pointers as to how I should go about deciphering the logs and getting them to you would be great,

Sorry to be such a noob at this,

Stu

---

Date: Wed, 24 Jun 2015 14:10:12 +0200
Subject: Re: Unable to set hw params - protocol error
From: samuel.engelmajer@xxxxxxxxxx
To: stusmithe@xxxxxxxxxxx
CC: alsa-user@xxxxxxxxxxxxxxxxxxxxx

Hi Stu,

it looks like Alsa is having trouble retrieving mixer control information from the device,
or a quirk is missing, or something like that.

Recent kernels have a new usb_audio_dbg() feature that dynamically enable printing of debug information for usb audio.

If you kernel was compiled with DEBUG, this information should be logged in messages or kern.log

Otherwise you need to recompile with this option or with DYNAMIC_DEBUG option,
and then activate debug traces for the mixer using the command:

  echo "file mixer.c" > /sys/kernel/debug/dynamic_debug/control

Activating traces for any file located under "sound/usb/" could also be useful.

Then, plug your card, try to aplay and amixer, and let us know what comes out.

Hope this helps,

Sam

2015-06-24 13:20 GMT+02:00 noblesavage114 <stusmithe@xxxxxxxxxxx>:

Have made a 48K 16bit wav file for testing and get error msg:

stu@Server:~$ sudo aplay -D plughw:1,0 /media/Disk2/Rehab.wav

Playing WAVE '/media/Disk2/Rehab.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo

aplay: set_params:1297: Unable to install hw params:

ACCESS:  RW_INTERLEAVED

FORMAT:  S16_LE

SUBFORMAT:  STD

SAMPLE_BITS: 16

FRAME_BITS: 32

CHANNELS: 2

RATE: 48000

PERIOD_TIME: 125000

PERIOD_SIZE: 6000

PERIOD_BYTES: 24000

PERIODS: 4

BUFFER_TIME: 500000

BUFFER_SIZE: 24000

BUFFER_BYTES: 96000

TICK_TIME: 0

alsamixer gives error when I try to select xmos:

cannot load mixer controls: Protocol error

The output from the alsa info script is here:

http://www.alsa-project.org/db/?f=fbc3b0551ec41aa0398a12bee53056a1acfafe32  

lsusb -v  - is available at:

http://www.justvape.co.uk/LSUSB.htm

Have spent a weekend on this before I called for help, any advice would be great - specifically if this xmos board will not work then I will know - it works under windows fine.

It is the 10pin U8 xmos daughter board for chinese AK4399 dac also for the ES9018 Dac i Believe

Stu

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Monitor 25 network devices or servers for free with OpManager!
OpManager is web-based network management software that monitors 
network devices and physical & virtual servers, alerts via email & sms 
for fault. Monitor 25 devices for free with no restriction. Download now
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