Re: Tascam US-122L - Corrupt USB descriptor

[Clemens Ladisch]

Simon Wood wrote:
> On Thu, April 14, 2016 1:35 am, Clemens Ladisch wrote:
>> Simon Wood wrote:
>>> The card shows up under '/proc/asound/cards', but only as Midi.
>>
>> Apparently, there is no PCM device. This driver creates a special
>> hardware-dependent device which is intended to be used with the Jack driver
>> "usb_stream".
>>
>> It might be possible to use the ALSA "usb_stream" plugin:
>> 
>
> I have this '.asoundrc' file (made before previous postings), but that
> does not seem to make a usable card.

What error message do you get when you try to use aplay with that device?

> I'm expecting that a PCM device should /just/ appear under 'aplay -l'

The driver does not implement such a PCM device.


Regards,
Clemens
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Re: Tascam US-122L - Corrupt USB descriptor

[Simon Wood]

On Thu, April 14, 2016 1:35 am, Clemens Ladisch wrote:
> Simon Wood wrote:
>
>> The card shows up under '/proc/asound/cards', but only as Midi.
>>
>
> Apparently, there is no PCM device. This driver creates a special
> hardware-dependent device which is intended to be used with the Jack driver
> "usb_stream".
>
>
> It might be possible to use the ALSA "usb_stream" plugin:
> 

I have this '.asoundrc' file (made before previous postings), but that
does not seem to make a usable card.

I'm expecting that a PCM device should /just/ appear under 'aplay -l', but
that is not happening. Perhaps there is a step I am missing, or I am just
confused about what qualifies a 'working' US-122L.

Do I need to be using a specific version of (userland) Alsa?

It would be nice to get a 'nod' from a person who has the US-122L workin
on their system. But I do appreciate Clemens' help and guidance,
Simon.

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Re: Tascam US-122L - Corrupt USB descriptor

[Clemens Ladisch]

Simon Wood wrote:
> The card shows up under '/proc/asound/cards', but only as Midi.

Apparently, there is no PCM device. This driver creates a special
hardware-dependent device which is intended to be used with the
Jack driver "usb_stream".

It might be possible to use the ALSA "usb_stream" plugin:



Regards,
Clemens
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Re: Tascam US-122L - Corrupt USB descriptor

[Simon Wood]

On Wed, April 13, 2016 3:01 am, Clemens Ladisch wrote:
> Simon Wood wrote:
>
>> I have been struggling for the past few days to get a Tascam US-122L
>> (USB
>> sound-card/midi interface) working, despite reading numerous forum
>> postings I have only been able to get the midi portion working.
>
> Does it show up with "aplay -l"?

The card shows up under '/proc/asound/cards', but only as Midi. See
attached for full listing.


>> I note that the USB descriptor seems to be corrupt. It declares 2
>> interfaces, but then describes 3 separate with the same interface number
>>  for the last 2.
>
> The descriptors describe two alternate settings for the same interface.
> This is a feature, which is required for audio devices.
>
>
>> iManufacturer   1 (error)<-- Here be 
>> Errors! iProduct
>> 2 (error)
>> iSerial 3 (error)
>
> It's possible that lsusb does not have the permissions needed to send
> the messages to ask for the strings.  Try running it as root.

Was running as root (on Xubuntu, 2 different machines, different installs).

I note that sometimes this is OK, ie when I do '# echo 0 >
/sys/bus/usb/devices/1-2/bConfigurationValue', but then I have no
interfaces at all (no midi, no listing).

Can anyone confirm they have a US-122L working on a new kernel. Is the USB
descriptor the same as what I'm seeing, perhaps hardware changed at some
point.
Cheers,
Simon# cat /proc/asound/cards  > aplay_l.txt
 0 [Audigy2]: Audigy2 - SB Audigy 2 ZS [SB0350]
  SB Audigy 2 ZS [SB0350] (rev.4, serial:0x20021102) at 
0xccc0, irq 27
 1 [US122L ]: USB US-122L - TASCAM US-122L
  TASCAM US-122L (644:800e if 0 at 001/005)

# aplaymidi -l >> aplay_l.txt
 PortClient name  Port name
 14:0Midi Through Midi Through Port-0
 16:0SB Audigy 2 ZS [SB0350]  Audigy MPU-401 (UART)
 16:32   SB Audigy 2 ZS [SB0350]  Audigy MPU-401 #2
 17:0Emu10k1 WaveTableEmu10k1 Port 0
 17:1Emu10k1 WaveTableEmu10k1 Port 1
 17:2Emu10k1 WaveTableEmu10k1 Port 2
 17:3Emu10k1 WaveTableEmu10k1 Port 3
 20:0TASCAM US-122L   TASCAM US-122L MIDI 1

# aplay -l >> aplay_l.txt
 List of PLAYBACK Hardware Devices 
card 0: Audigy2 [SB Audigy 2 ZS [SB0350]], device 0: emu10k1 [ADC 
Capture/Standard PCM Playback]
  Subdevices: 32/32
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
  Subdevice #8: subdevice #8
  Subdevice #9: subdevice #9
  Subdevice #10: subdevice #10
  Subdevice #11: subdevice #11
  Subdevice #12: subdevice #12
  Subdevice #13: subdevice #13
  Subdevice #14: subdevice #14
  Subdevice #15: subdevice #15
  Subdevice #16: subdevice #16
  Subdevice #17: subdevice #17
  Subdevice #18: subdevice #18
  Subdevice #19: subdevice #19
  Subdevice #20: subdevice #20
  Subdevice #21: subdevice #21
  Subdevice #22: subdevice #22
  Subdevice #23: subdevice #23
  Subdevice #24: subdevice #24
  Subdevice #25: subdevice #25
  Subdevice #26: subdevice #26
  Subdevice #27: subdevice #27
  Subdevice #28: subdevice #28
  Subdevice #29: subdevice #29
  Subdevice #30: subdevice #30
  Subdevice #31: subdevice #31
card 0: Audigy2 [SB Audigy 2 ZS [SB0350]], device 2: emu10k1 efx [Multichannel 
Capture/PT Playback]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 0: Audigy2 [SB Audigy 2 ZS [SB0350]], device 3: emu10k1 [Multichannel 
Playback]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Audigy2 [SB Audigy 2 ZS [SB0350]], device 4: p16v [p16v]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Re: Tascam US-122L - Corrupt USB descriptor

[Clemens Ladisch]

Simon Wood wrote:
> I have been struggling for the past few days to get a Tascam US-122L (USB
> sound-card/midi interface) working, despite reading numerous forum
> postings I have only been able to get the midi portion working.

Does it show up with "aplay -l"?

> I note that the USB descriptor seems to be corrupt. It declares 2
> interfaces, but then describes 3 separate with the same interface number
> for the last 2.

The descriptors describe two alternate settings for the same interface.
This is a feature, which is required for audio devices.

>   iManufacturer   1 (error)   <-- Here be 
> Errors!
>   iProduct2 (error)
>   iSerial 3 (error)

It's possible that lsusb does not have the permissions needed to send
the messages to ask for the strings.  Try running it as root.


Regards,
Clemens
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