[alsa-devel] [PATCH] add Steinberg UR44 USB Audio Interface support to quirks-table

[Cyrus Harmon]

On Mar 11, 2014, at 1:31 AM, Clemens Ladisch <clemens at ladisch.de> wrote:

> Cyrus Harmon wrote:
>> On Mar 10, 2014, at 8:40 AM, Clemens Ladisch <clemens at ladisch.de> wrote:
>>> In theory, kernel 3.11 and later should support this device without
>>> a quirk entry.  I guess it actually does not?
>> 
>> no, the stock kernel doesn’t support this device.
> 
> Strange; in theory, the driver should be able to pick up these
> descriptors.
> 
> Are there any error messages in the system log when you plug it in or
> reload the unpatch snd-usb-audio driver?

Following up on this from last week, here’s the error message I see with an unpatched kernel:

Mar 11 02:25:11 cbox kernel: [   82.426640] usb 2-1.6: new high-speed USB device number 4 using ehci-pci
Mar 11 02:25:12 cbox kernel: [   82.515364] usb 2-1.6: New USB device found, idVendor=0499, idProduct=150e
Mar 11 02:25:12 cbox kernel: [   82.515368] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Mar 11 02:25:12 cbox kernel: [   82.515370] usb 2-1.6: Product: Steinberg UR44
Mar 11 02:25:12 cbox kernel: [   82.515372] usb 2-1.6: Manufacturer: Yamaha Corporation
Mar 11 02:25:12 cbox kernel: [   82.518134] snd-usb-audio: probe of 2-1.6:1.0 failed with error -5
Mar 11 02:25:12 cbox kernel: [   82.523317] snd-usb-audio: probe of 2-1.6:1.1 failed with error -5
Mar 11 02:25:12 cbox mtp-probe: checking bus 2, device 4: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.6"
Mar 11 02:25:12 cbox mtp-probe: bus: 2, device: 4 was not an MTP device

Any suggestions for further debugging this?

Also, from an earlier message,

On Mar 10, 2014, at 8:40 AM, Clemens Ladisch <clemens at ladisch.de> wrote:

> This sounds as if the playback stream needs to be synchronized to the
> recording stream

Any pointers on where I might look to figure out how to do this?

thanks again,

Cyrus