---------------------------- Original Message ----------------------------
Subject: Re: [LAD] USB device dmesg error
From: tom@email-addr-hidden
Date: Fri, September 20, 2013 15:52
To: "Clemens Ladisch" <clemens@email-addr-hidden>
--------------------------------------------------------------------------
Hei Clemens,
thanks for your reply.
> tom@email-addr-hidden wrote:
>> i'm trying to use a Roland R-26 as audio interface (USB).
>>
>> I saw it is now officially supported in the alsa-driver repo log
>
> This support is not complete.
>
> Please show the output of "lsusb -v" for this device.
the output i get is:
---
Couldn't open device, some information will be missing
Bus 001 Device 007: ID 0582:013e Roland Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 255
bMaxPacketSize0 64
idVendor 0x0582 Roland Corp.
idProduct 0x013e
bcdDevice 0.00
iManufacturer 1
iProduct 2
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 124
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 2
bInterfaceProtocol 2
iInterface 0
** UNRECOGNIZED: 06 24 f1 01 00 00
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 2
bInterfaceProtocol 2
iInterface 0
** UNRECOGNIZED: 07 24 01 01 00 01 00
** UNRECOGNIZED: 0b 24 02 01 02 04 18 01 44 ac 00
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x0d EP 13 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0038 1x 56 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 2
bInterfaceProtocol 1
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 2
bInterfaceProtocol 1
iInterface 0
** UNRECOGNIZED: 07 24 01 07 00 01 00
** UNRECOGNIZED: 0b 24 02 01 02 04 18 01 44 ac 00
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x8e EP 14 IN
bmAttributes 37
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Implicit feedback Data
wMaxPacketSize 0x0038 1x 56 bytes
bInterval 1
---
-> the "Couldn't open device" looks suspicious
>
>> $ aplay a.wav
>> Playing WAVE 'rabe_babe.wav' : Signed 16 bit Little Endian, Rate 44100
>> Hz, Stereo
>>
>> -> there are no errors, but it stays like this (a.wav is a few seconds)
>> forever and there is no volume indication "from PC" on the device.
>>
>> $ arecord -f cd b.wav
>> Recording WAVE 'b.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
>> Stereo
>>
>> -> no errors but the file is empty (44 bytes), the device shows active
>> mic
>> level "to PC"
>
> I guess this is one of the devices that use implicit feedback
> synchronization, which is very buggy in the current driver. As far as
> I know, only Jack works with these devices.
>
Huh? How could that work with JACK if it doesn't with ALSA?
Btw, this is what i get when trying to start JACK with it:
--
ub64@email-addr-hidden:~/tmp$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: R26AUDIO [R-26(AUDIO)], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
ub64@email-addr-hidden:~/tmp$ lsof /dev/snd/*
ub64@email-addr-hidden:~/tmp$ ps aux | grep jack
ub64 2340 0.0 0.0 10856 884 pts/1 S+ 15:50 0:00 grep
--color=auto jack
ub64@email-addr-hidden:~/tmp$ jackd -d alsa -r 44100 -p 1024 -n 3 -d hw:0,0
jackdmp 1.9.8
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2011 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
no message buffer overruns
no message buffer overruns
no message buffer overruns
JACK server starting in realtime mode with priority 10
control device hw:0
control device hw:0
audio_reservation_init
Acquire audio card Audio0
creating alsa driver ... hw:0,0|hw:0,0|1024|3|44100|0|0|nomon|swmeter|-|32bit
control device hw:0
ATTENTION: The capture device "hw:0,0" is already in use. The following
applications are using your soundcard(s) so you should check them and
stop them as necessary before trying to start JACK again:
jackd (process ID 2341)
Cannot initialize driver
JackServer::Open() failed with -1
Failed to open server
--
>
> Regards,
> Clemens
>
Ciao,
Thomas
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Received on Sat Sep 21 04:15:02 2013
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