Le 01/10/2012 22:15, Florian Hanisch a écrit :
Dear all,
I already posted this question on other lists, so maybe one or the other
has seen it, I apologize for sending it again.
I have been trying to connect a friend's soundcard (RME fireface UCX)
to my linux computer (recent ubuntu 12.04 installation - NOT ubuntu
studio, kernel 3.2.0-29-generic, ALSA version 1.0.25). RME claims that
the device has a class compliance mode, so that it should be able to
communicate with a linux system just using the USB-audio-2.0 standard
(which, to my
knowledge, is available on linux). This class compliance mode works
when the device is connected to an apple computer.
Pluging the device, I get the following messages from dmesg:
[ 864.024093] usb 1-1: new high-speed USB device number 5 using ehci_hcd
[ 864.162776] usbaudio: unit 2: invalid UAC_FEATURE_UNIT descriptor
[ 864.162831] snd-usb-audio: probe of 1-1:1.0 failed with error -5
As outputed in ths log, it appears the drivers fails to manage the sound
card: probe of 1-1:1.0 failed with error -5
My advice would be to get help from the ALSA men.
http://alsa-project.org/main/index.php/Help_To_Debug
RME Fireface UCX has not been tagged as supported by the alsa project,
i am sure they would be interested in having some debug info.
The "lsusb - v" (quite lengthy, so I don't include it here) output lists
the device, so it seems that it is recognized but can not be properly
connected. It does not appear neither appear in the system settings nor
in JACK.
Am I missing some extra packages, libaries, ... to be able to have
full USB-audio-2.0 support ? Do I have to change some kernel options ?
Maybe the snd-usb-audio driver has some parameters that would help to
obtain more precise debug information. If i type modinfo snd-usb-audio,
i can see:
parm: index:Index value for the USB audio adapter. (array of int)
parm: id:ID string for the USB audio adapter. (array of charp)
parm: enable:Enable USB audio adapter. (array of bool)
parm: vid:Vendor ID for the USB audio device. (array of int)
parm: pid:Product ID for the USB audio device. (array of int)
parm: nrpacks:Max. number of packets per URB. (int)
parm: async_unlink:Use async unlink mode. (bool)
parm: device_setup:Specific device setup (if needed). (array
of int)
parm: ignore_ctl_error:Ignore errors from USB controller for
mixer interfaces. (bool)
To test a param with the driver, unload it (modprobe -r), and manually
reload it with parameters in the command-line, using modprobe.
Any other ideas ?
Thanks,
Florian
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