[alsa-devel] [PATCH 0/6] snd-usb endpoint rework, version 6

[Grant Diffey]

On Mon, Jan 2, 2012 at 4:09 AM, Felix Homann <linuxaudio at showlabor.de>wrote:

> Happy New Year!
>
> That being said, I've tested a kernel without Daniel's patch set. It
> doesn't work either. The error messages are only slightly different:
>
> Jan  1 11:52:31 weasel mtp-probe: checking bus 1, device 4:
> "/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-1"
> Jan  1 11:52:31 weasel mtp-probe: bus: 1, device: 4 was not an MTP device
> Jan  1 11:52:31 weasel kernel: [  161.880773] usbcore: registered new
> interface driver snd-usb-audio
> Jan  1 11:52:34 weasel kernel: [  164.284980] cannot submit datapipe
> for urb 0, error -28: not enough bandwidth
>
> So, It's not related to Daniel's rework. But nevertheless, something's
> broken...
>

are you sure it's connected to an EHCI (usb2) controller?

Grant.