USB audio device no longer working w/ new kernel

Hi, all--
I have a Creative SoundBlaster Live! 24 external USB audio box which I have been using for probably 3 years--with Arch Linux and without any significant trouble. Suddenly, after a full system upgrade (so that I am now running the 2.6.27-ARCH kernel), it is not working. Alsamixer doesn't detect it, and the power LED on the box is dark (it draws power through the USB connection).
So far, the only relevant info I have found is in /var/log/messages. For USB connections I primarily use an add-on USB card plugged into a PCI socket (it's an Adaptec USB 2.0 card ... I can find more specifics if needed). That card has 2 ports, and I usually have the USB audio box and an external hub plugged into it. I currently have a printer plugged into the external hub. The hub and the printer were successfully detected at the last bootup, but
Oct 18 13:13:46 $MYHOSTNAME usb 1-2: new full speed USB device using ohci_hcd and address 2
Oct 18 13:13:46 $MYHOSTNAME usb 1-2: configuration #1 chosen from 1 choice
Oct 18 13:13:46 $MYHOSTNAME snd-usb-audio: probe of 1-2:1.0 failed with error -5
[of course, the actual hostname appears in the messages where I put $MYHOSTNAME]
Anybody have an idea what might be going on?
Thanks in advance for any clues.

Check the archlinux news item which calls for an entry in kernel commandline .................

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The strange thing is that the sound card does in fact work; e.g. the sound test for "HDA Intel PCH", the first entry in my KDE Audio Settings, works. But the entry "default" does not and I suppose that is also the device that VLC is complaining about.
I've tried blacklisting the HDMI driver and switched to the other audio output modules in VLC. I've also checked I'm still member of the "audio" group.
Edit:
P.S. Solved this myself. I had a USB-to-MIDI adapter cable plugged in during boot, which seems to have been causing these problems. I suppose systemd thought it was a USB sound card? I was wondering why dmesg said something about USB sound when the computer doesn't have any USB sound devices. Hardware detection epic fail. Although I guess the cable counts as a MIDI device at least, so in a way it's correct.
So it looks like I'll always have to unplug the MIDI cable before rebooting.
Last edited by Morn (2012-11-23 19:24:00)

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