Re: linux does not recognize my midi controller samson carbon 61

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On 08/15/2014 12:21 AM, Lion Bino wrote:
> I have a problem a midi controller, a Samson Carbon 61. When I connect
> via usb, dmesg tells me the following.
> 
> 
>         [ 1480.097123] usb 2-1.1: new full-speed USB device number 9
> using ehci_hcd
>         [ 1480.118082] usb 2-1.1: no configurations
>         [ 1480.118087] usb 2-1.1: can't read configurations, error -22
>         [ 1480.118206] hub 2-1:1.0: unable to enumerate USB device on
> port 1

That's not an ALSA problem, but most probably a firmware bug. A device
with bNumConfigurations == 0 is invalid. Copied the linux-usb list.

> I use ubuntu 12.04 and 14.04 and nothing, I have tested in windows
> and works well.

Could you follow the instructions in this document and generate a usbmon
trace when connecting the device? I'd like to know whether the entire
device descriptor is garbled.


https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/usb/usbmon.txt


Thanks,
Daniel


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