Further testing reveals the interface works with playback only at 44.1kHz, 1024 frames, 3 periods. However there are continual clicks when playing audio, while jackd does not report xruns. Jackd does start at 48 or 96 kHz, or with 128 frames/period, but then there is no sound (but no errors either). Or sometimes sound justs stops at some point, but jackd is still running without errors or xruns. Best possible performance (with clicks) is 44.1kHz, 256 frames/period, 3 periods/buffer. Still the interface is reported as running at high speed. On the other (desktop) PC there is no such issue, as I reported before (works flawlessly at 96kHz with 2ms latency).
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1402196 Title: Behringer UMC404 USB2 audio interface disconnects when initialized Status in linux package in Ubuntu: Confirmed Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402196/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp