Re: TC-Helicon Blender

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On Mon, 13 Feb 2023 08:57:19 +0100,
Florian Hänel wrote:
> 
> I have this USB device called TC-Helicon Blender which provides 12
> input streams, 8 output streams (6/4 stereo plugs), in addition to
> some midi interface and internal playback and record channel.
> 
> Bus 005 Device 016: ID 1220:8fe1 TC Electronic Blender
> 
> If I power the device on while connected to a windows machine with its
> driver installed, then plug it into my linux machine, it appears to
> work correctly:
> 
> arecord -D front:CARD=Blender  -r48000 -fS32_LE -c 12 blender.wav -d 20
> Recording WAVE 'blender.wav' : Signed 32 bit Little Endian, Rate 48000
> Hz, Channels 12
> 
> 46080044 blender.wav
> 
> However if I have it on my linux machine while powering it on, I only
> get timeouts and no samples from arecord:
> 
> arecord -D front:CARD=Blender  -r48000 -fS32_LE -c 12 blender.wav -d 20
> Recording WAVE 'blender.wav' : Signed 32 bit Little Endian, Rate 48000
> Hz, Channels 12
> arecord: pcm_read:2221: read error: Input/output error
> 
> 44 blender.wav

So the device didn't give any data.

> What can I do to try and get this device to init correctly under
> linux? I have captured USB packets of the init phase using wireshark
> on both windows and linux but comparing them is tedious if I don't
> know what to look for. Are there quirks flags I can play around with?
> This is my first time looking at a linux device driver issue like
> this.

Is it only about capture, i.e. playback works?
Also, which kernel version are you testing?

There are lots of quirks in USB-audio driver, take a look at
sound/usb/quirks.c.  You can apply the existing quirk for your device
with quirk_alias module option.

> Would it be ok to attach the usb captures on this mailing list?

The size matters, so no big data please.


Takashi



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