From mboxrd@z Thu Jan  1 00:00:00 1970
From: Clemens Ladisch <clemens@ladisch.de>
Subject: Re: trying to get an eleven rack to work
Date: Thu, 29 Mar 2012 09:08:26 +0200
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To: David Alexander <lidxv0n@gmail.com>, Daniel Mack <daniel@zonque.org>
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David Alexander wrote:
> kernel: [   74.128035] usb 2-4: new high speed USB device number 2
> kernel: [   74.634592] ALSA mixer.c:1938 usbaudio: unit 32: unexpected type 0x09
> kernel: [   74.634606] snd-usb-audio: probe of 2-4:1.0 failed with error -5

0x09 is UAC2's EXTENSION_UNIT, which should not be a reason for failing.
Please try the patch below.


Regards,
Clemens


--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1926,7 +1926,7 @@ static int parse_audio_unit(struct mixer_build *state, int unitid)
 			return parse_audio_processing_unit(state, unitid, p1);
 	default:
 		snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
-		return -EINVAL;
+		return 0;
 	}
 }