I've finished the test on all available kernels. "kernel-bug-exists- upstream" has been added to the tags, the bug description has also been updated according to my test result. Good luck on fixing the bug!
** Description changed: 1) The release of Ubuntu using Ubuntu 12.10 AMD64. - Ubuntu 13.04 AMD64, daily build as of 20130314. + Ubuntu 13.04 AMD64, daily build as new as 20130314. 2) The version of the package used - linux-image-3.5.0-26-generic and later. + linux-image-3.5.0-26-generic + linux-image-3.5.7-03050706-generic_3.5.7-03050706.201302221435_amd64.deb + http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5.7.6-quantal/ + linux-image-3.7.7-030707-generic_3.7.7-030707.201302111436_amd64.deb + http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.7.7-raring/ + linux-image-3.8.0-030800rc7-generic_3.8.0-030800rc7.201302081635_amd64.deb + http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.8-rc7-raring/ + + This bug had been confirmed appearing after the following kernel upgrade step: + 3.5.0-25 > 3.5.0-26 + 3.5.7.5 > 3.5.7.6 + 3.7.6 > 3.7.7 + 3.8.0-rc6 > 3.8.0-rc7 3) What you expected to happen - When using a USB DAC to play audio, the audio should be played smoothly without breaks and cracking sound. + When using a USB DAC to play audio, the audio should be played normally without any interruption. 4) What happened instead - After upgrading to Linux kernel 3.5.0-26-generic, one of my USB DAC (Digital Audio Codec) suddenly started to produce constently discontinous sound. Whenever there is audio being played by the system, the outcome would be always accompany with regular, stable, 5 to 6 times per second breaks. Both the system sound and songs from media player failed. + This bug seems to affect only a certain kind of hardware, which is called "Asynchronous USB Digital Audio Codec (DAC)". It's said that such a DAC hosts the clock itself (USB Device Host). An ordinary DAC, so called "Synchronous USB DAC", uses the clock hosted by the mother board, which is not affected by this bug. - One of my USB DAC works under Asynchronous Mode (USB device host clock), - the other one works under Synchronous Mode (Motherboard host clock). The - Synchronous one worked as usual after the updrade, while the - Asynchronous failed to work after the upgrade. + When this bug affects an asynchronous USB DAC, the audio played by the + DAC is constantly interrupted. The playback itself does not stop, but + the output becomes discontinous, filling with constant crackling noises, + destroying everything the DAC plays. - I downgraded the package to the previous 3.5.0-25-generic, then - everything went back to normal. + I have two USB DACs, one Asynchronous and the other one Synchronous. + Only the Asynchronous one is affected by this bug. - I have recheck the source of the issue, and find out: - This bug will appear after install kernel 3.5.7.6: - http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5.7.6-quantal/ - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1131944 + This bug had been confirmed appearing after the following kernel upgrade step: + 3.5.0-25 > 3.5.0-26 + 3.5.7.5 > 3.5.7.6 + 3.7.6 > 3.7.7 + 3.8.0-rc6 > 3.8.0-rc7 + I used Kdiff to find the similar patches, and find the following patches suspicous: + USB: XHCI: fix memory leak of URB-private data + (appeared in 3.5.7.6/3.7.7/3.8.0-rc7) + USB: EHCI: fix for leaking isochronous data + (appeared in 3.7.7/3.8.0-rc7) + usb: Prevent dead ports when xhci is not enabled + (appeared in 3.5.7.6/3.7.7/3.8.0-rc7) + usb: Using correct way to clear usb3.0 device's remote wakeup feature + (appeared in 3.5.7.6/3.7.7/3.8.0-rc7) + USB: EHCI: remove ASS/PSS polling timeout + (appeared in 3.7.7/3.8.0-rc7) + USB: EHCI: unlink one async QH at a time + (appeared in 3.7.7/3.8.0-rc7) + USB: EHCI: fix timer bug affecting port resume + (appeared in 3.5.7.6/3.7.7/3.8.0-rc7) + USB: EHCI: fix bug in scheduling periodic split transfers + (appeared in 3.5.7.6/3.7.7/3.8.0-rc7) - kernel 3.5.7.5 and older were all fine. - http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5.7.5-quantal/ + Hope someone can look into this bug soon! --- ApportVersion: 2.6.1-0ubuntu10 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: tysontan 2117 F.... pulseaudio /dev/snd/controlC1: tysontan 2117 F.... pulseaudio /dev/snd/pcmC1D0p: tysontan 2117 F...m pulseaudio CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. DistroRelease: Ubuntu 12.10 HibernationDevice: RESUME=UUID=8545c3e2-caba-4eaa-8fa4-2fbebcc2d9bb InstallationDate: Installed on 2013-02-15 (14 days ago) InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5) IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: LENOVO 0053A11 MarkForUpload: True Package: linux 3.5.0.26.32 PackageArchitecture: amd64 ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-26-generic root=UUID=8c60a142-505f-4d74-afa0-37686558e86e ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.5.0-26.40-generic 3.5.7.6 RelatedPackageVersions: linux-restricted-modules-3.5.0-26-generic N/A linux-backports-modules-3.5.0-26-generic N/A linux-firmware 1.95 RfKill: Tags: quantal package-from-proposed running-unity third-party-packages Uname: Linux 3.5.0-26-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 10/11/2012 dmi.bios.vendor: LENOVO dmi.bios.version: 6QET70WW (1.40 ) dmi.board.name: 0053A11 dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr6QET70WW(1.40):bd10/11/2012:svnLENOVO:pn0053A11:pvrThinkPadX201Tablet:rvnLENOVO:rn0053A11:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 0053A11 dmi.product.version: ThinkPad X201 Tablet dmi.sys.vendor: LENOVO ** Summary changed: - Asynchronous USB DAC cracking sound in Linux kernel 3.5.0.26 and later + USB Audio Codec jerky playback (crackling noise) ** Tags added: kernel-bug-exists-upstream -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1136110 Title: USB Audio Codec jerky playback (crackling noise) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1136110/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
