Kernel 3.18 fixes the bug only for playback-only or capture-only mode, with rates up to 96kHz (the maximum) and latency down to 2ms. Duplex modes still have a great number of xruns (every 5-10s), even with very conservative settings (44.1kHz, 1024 frames/period, 3 periods/buffer), and mostly the same at higher speeds. This makes the interface impossible to use in duplex. Maybe this isn't the same bug though ?
-- 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
