This message appears to be coming from sound/usb/pcm.c: retire_playback_urb() /* * Report when delay estimate is off by more than 2ms. * The error should be lower than 2ms since the estimate relies * on two reads of a counter updated every ms. */ if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n", est_delay, subs->last_delay);
I think it is a totally useless message to repeat constantly and can be rate limited. Its also likely a function of your USB device firmware. -- 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/1305133 Title: usb headset causes "delay: estimated / actual" spam in dmesg Status in “linux” package in Ubuntu: Confirmed Bug description: I sometimes have a USB headset plugged in to my computer. When the headset is plugged in, I get hundreds (thousands?) of messages like the following in dmesg and syslog: [63467.527274] delay: estimated 384, actual 240 [63490.543473] delay: estimated 0, actual 240 [63490.543490] delay: estimated 528, actual 240 [63490.543853] delay: estimated 480, actual 240 [63493.545912] delay: estimated 96, actual 240 [63493.548295] delay: estimated 384, actual 240 [63494.546711] delay: estimated 0, actual 240 [63494.546728] delay: estimated 528, actual 240 [63500.551524] delay: estimated 0, actual 240 [63500.551544] delay: estimated 528, actual 240 [63500.551560] delay: estimated 528, actual 240 To reproduce: 1) Plug in a USB headset Expected results: No "delay: estimated" spam in the kernel log (dmesg/syslog/kern.log) Actual results: Hundreds of similar messages about estimated + actual delays in the kernel log. Unplugging the USB headset makes the problem stop. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-23-generic 3.13.0-23.45 ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8 Uname: Linux 3.13.0-23-generic x86_64 ApportVersion: 2.14.1-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: steve 2277 F.... pulseaudio /dev/snd/controlC1: steve 2277 F.... pulseaudio /dev/snd/controlC0: steve 2277 F.... pulseaudio CurrentDesktop: Unity Date: Wed Apr 9 11:11:23 2014 DistributionChannelDescriptor: # This is a distribution channel descriptor # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-precise-amd64-20130203-1 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=79084358-087f-4cee-a0be-e2f78361873f InstallationDate: Installed on 2013-12-02 (127 days ago) InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50 MachineType: Dell Inc. XPS13 9333 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-23-generic root=UUID=0b9db31c-747b-40ad-bbbd-13a9a29caece ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-23-generic N/A linux-backports-modules-3.13.0-23-generic N/A linux-firmware 1.127 SourcePackage: linux UpgradeStatus: Upgraded to trusty on 2014-02-12 (55 days ago) dmi.bios.date: 11/11/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A01 dmi.board.name: 0GFTRT dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA01:bd11/11/2013:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.name: XPS13 9333 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1305133/+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