The issue is still present on a fresh install of Saucy, and also just now tested with the daily livecd of Trusty with the same results. The "nohz=off" workaround still works in both cases.
I will upload the apport information for the Trusty daily livecd shortly. I am uploading a direct line recording I just made of "speaker-test -c2 -tsine -f80" which shows the problem. The best way I can describe it is an intermittent "mincing" in the left channel only. ** Attachment added: "Left channel crackling audio sample, Delta 1010LT card + F11 BIOS" https://bugs.launchpad.net/linux/+bug/814426/+attachment/3905843/+files/mincing_audio.ogg -- 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/814426 Title: Crackling Sound on PCI card Status in The Linux Kernel: Fix Released Status in “linux” package in Ubuntu: Incomplete Bug description: On my CyberpowerPC Gamer Xtreme 1030 desktop running up-to-date Natty Narwhal 64bit on fresh install, there is a variable crackling overlaying the sound on my card when any sound is playing. It is invariable to the output, as looping the same clip does not cause crackling to loop. The output of sudo aplay -l is: card 0: M1010LT [M Audio Delta 1010LT], device 0: ICE1712 multi [ICE1712 multi] Subdevices: 1/1 Subdevice #0: subdevice #0 Any idea's on what this is? Occurs with pulseaudio on or off (even with speaker-test), and only on my Delta 1010LT sound card. Jaunty livecd plays audio without crackles, while Natty livecd produces crackles. WORKAROUND: nohz=off --- AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23. AplayDevices: **** List of PLAYBACK Hardware Devices **** card 0: M1010LT [M Audio Delta 1010LT], device 0: ICE1712 multi [ICE1712 multi] Subdevices: 1/1 Subdevice #0: subdevice #0 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: M1010LT [M Audio Delta 1010LT], device 0: ICE1712 multi [ICE1712 multi] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: erik 2464 F.... pulseaudio /dev/snd/seq: erik 1737 F.... qjackctl CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'M1010LT'/'M Audio Delta 1010LT at 0xdf00, irq 18' Mixer name : 'ICE1712 - multitrack' Components : '' Controls : 85 Simple ctrls : 57 DistroRelease: Ubuntu 11.04 HibernationDevice: RESUME=UUID=4362b0a7-9c03-48cc-a343-67976cd430cb InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1) IwConfig: lo no wireless extensions. eth0 no wireless extensions. MachineType: Gigabyte Technology Co., Ltd. P55M-UD2 NonfreeKernelModules: nvidia Package: linux (not installed) ProcEnviron: LANGUAGE=en_US:en LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-8-lowlatency root=UUID=903ba33e-b5c1-4749-ab76-e2f85a408b31 ro vga=769 quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 2.6.38-8.42~ppa2-lowlatency 2.6.38.2 RelatedPackageVersions: linux-restricted-modules-2.6.38-8-lowlatency N/A linux-backports-modules-2.6.38-8-lowlatency N/A linux-firmware 1.52 RfKill: Tags: natty Uname: Linux 2.6.38-8-lowlatency x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm admin audio cdrom dialout lpadmin plugdev sambashare dmi.bios.date: 06/23/2010 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F11 dmi.board.name: P55M-UD2 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF11:bd06/23/2010:svnGigabyteTechnologyCo.,Ltd.:pnP55M-UD2:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP55M-UD2:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: P55M-UD2 dmi.sys.vendor: Gigabyte Technology Co., Ltd. --- AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. AplayDevices: **** List of PLAYBACK Hardware Devices **** card 0: M1010LT [M Audio Delta 1010LT], device 0: ICE1712 multi [ICE1712 multi] Subdevices: 1/1 Subdevice #0: subdevice #0 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/controlC0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/midiC0D0', '/dev/snd/by-path', '/dev/snd/by-id', '/dev/snd/controlC1', '/dev/snd/pcmC1D0c', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'M1010LT'/'M Audio Delta 1010LT at 0xdf00, irq 18' Mixer name : 'ICE1712 - multitrack' Components : '' Controls : 85 Simple ctrls : 57 Card1.Amixer.info: Card hw:1 'Camera'/'Vimicro Corp. Venus USB2.0 Camera at usb-0000:00:1a.7-4, high speed' Mixer name : 'USB Mixer' Components : 'USB0ac8:3420' Controls : 2 Simple ctrls : 1 Card1.Amixer.values: Simple mixer control 'Mic',0 Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum Capture channels: Mono Limits: Capture 0 - 48 Mono: Capture 37 [77%] [on] CasperVersion: 1.272 DistroRelease: Ubuntu 11.10 IwConfig: lo no wireless extensions. eth0 no wireless extensions. LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110801) MachineType: Gigabyte Technology Co., Ltd. P55M-UD2 Package: linux (not installed) ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity ProcVersionSignature: Ubuntu 3.0.0-7.9-generic 3.0.0 RelatedPackageVersions: linux-restricted-modules-3.0.0-7-generic N/A linux-backports-modules-3.0.0-7-generic N/A linux-firmware 1.56 RfKill: Tags: oneiric running-unity Uname: Linux 3.0.0-7-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare dmi.bios.date: 06/23/2010 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F11 dmi.board.name: P55M-UD2 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF11:bd06/23/2010:svnGigabyteTechnologyCo.,Ltd.:pnP55M-UD2:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP55M-UD2:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: P55M-UD2 dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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