[alsa-devel] Fwd: Support for Roland VG-99 (working code, but could use help)

Pete Leigh pete.leigh at gmail.com
Fri Oct 19 01:38:34 CEST 2012

Hi Daniel,

On 16 October 2012 09:36, Daniel Mack <zonque at gmail.com> wrote:

>>> Check out the latestes sound.git[*] and make sure your patch applies
>>> there.

> And I missed the annotation in the previous mail, so here it is:

> [*] git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git

I've got this kernel (sound.git) booting now, but I find that USB
audio isn't working
before I touch it.

When I connect my (known working) UA-25, this happens:

[  248.815369] usb 1-1.6: new full-speed USB device number 6 using ehci_hcd
[  248.913064] usb 1-1.6: New USB device found, idVendor=0582, idProduct=0074
[  248.913068] usb 1-1.6: New USB device strings: Mfr=1, Product=2,
[  248.913071] usb 1-1.6: Product: EDIROL UA-25
[  248.913074] usb 1-1.6: Manufacturer: Roland
 mtp-probe: checking bus 1, device 6:
 mtp-probe: bus: 1, device: 6 was not an MTP device
[  249.073737] cannot submit urb 0, error -28: not enough bandwidth

Any subsequent attempts to send audio to it result in a single "urb 0
error -28" message

I googled this a bit, and saw that there had been a problem looking like
this with USB full speed devices on ehci controllers, which does apply here.

Do you think that's what's biting me?


- Pete.

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