Public bug reported:
My audio interface, a Behriger UMC404, disappears from both lsusb and
/proc/asound/cards as soon as I start jackd (JACK 2). This results in
jackd failing because the card is missing. It reports a "protocol error"
which I think refers to the USB link. See attached syslog messages. The
card does not show up at all in Pulseaudio. Also, this card works just
fine on my desktop, the bug only occurs on my laptop.
Thanks,
TM
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-lowlatency 3.13.0.43.50
ProcVersionSignature: Ubuntu 3.13.0-43.72-lowlatency 3.13.11.11
Uname: Linux 3.13.0-43-lowlatency x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: tmeysson 3178 F.... pulseaudio
/dev/snd/controlC0: tmeysson 3178 F.... pulseaudio
CurrentDesktop: XFCE
Date: Sat Dec 13 14:39:46 2014
HibernationDevice: RESUME=UUID=be114ffc-be9c-47e3-b2b6-7f49c90f9931
InstallationDate: Installed on 2014-12-03 (10 days ago)
InstallationMedia: Ubuntu-Studio 14.04.1 LTS "Trusty Tahr" - Release amd64
(20140722.1)
MachineType: Hewlett-Packard HP EliteBook 840 G1
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-lowlatency
root=UUID=20e973d8-558f-476d-9979-54c79133177e ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-43-lowlatency N/A
linux-backports-modules-3.13.0-43-lowlatency N/A
linux-firmware 1.127.10
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/03/2014
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: L71 Ver. 01.21
dmi.board.name: 198F
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 15.55
dmi.chassis.asset.tag: 5CG446445Q
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvrL71Ver.01.21:bd09/03/2014:svnHewlett-Packard:pnHPEliteBook840G1:pvrA3008CD10003:rvnHewlett-Packard:rn198F:rvrKBCVersion15.55:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 840 G1
dmi.product.version: A3008CD10003
dmi.sys.vendor: Hewlett-Packard
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug trusty
** Attachment added: "syslog and jackd log"
https://bugs.launchpad.net/bugs/1402196/+attachment/4280274/+files/crash-UMC404.log
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https://bugs.launchpad.net/bugs/1402196
Title:
Behringer UMC404 USB2 audio interface disconnects when initialized
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