Thank you so much to: Jim for submitting this bug report; Luke for pointing out the PulseAudio logging wiki; and David for providing the workaround details for PulseAudio and snd-hda-intel. I've had the volume pop-up problem (easily 50+ times a day) since I built my system in late 2012 and only bummed that I finally found this bug report today instead of a long time ago.
I confirmed I was affected by the same jack sensing issue by using PulseAudio logging this way (based on the wiki; you might want to confirm you don't have an existing client.conf file): echo autospawn = no > ~/.config/pulse/client.conf pkill pulseaudio pulseaudio --daemonize -vv --log-time=1 --log-target=file:/tmp/pulseaudio.log tail -f /tmp/pulseaudio.log Searching the logs with: grep is.now /tmp/pulseaudio.log showed repeated messages like this: D (1565.604| 634.163) [pulseaudio] module-alsa-card.c: Jack 'Front Headphone Jack' is now plugged in D (1565.626| 0.020) [pulseaudio] module-alsa-card.c: Jack 'Front Headphone Jack' is now unplugged D (1712.599| 146.972) [pulseaudio] module-alsa-card.c: Jack 'Front Headphone Jack' is now plugged in D (1712.621| 0.020) [pulseaudio] module-alsa-card.c: Jack 'Front Headphone Jack' is now unplugged I was thinking I'd use the snd-hda-intel jackpoll_ms workaround, until I thought about actually checking the hardware setup on my system. First I connected/disconnected headphones to the front panel headphone jack to confirm the jack shown in the debug output above indeed toggled again while tailing the log. Then I disconnected the cable from my case to the motherboard "Front panel audio connector (AAFP)" since I never use those jacks anyway. This simple hardware fix worked for me and so I thought I'd share this information in case anyone else has the issue and wants to go this route so the kernel sound drivers don't have to process any interrupts generated by (phantom) audio jack plug events. To restore the standard PulseAudio daemon process without debugging, I re-enabled autospawn, killed the debug daemon process and after a few seconds it is restarted automatically: rm ~/.config/pulse/client.conf pkill pulseaudio -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/874535 Title: Volume Slider Jumps, due to rapidly changing hardware jack sense state Status in “alsa-driver” package in Ubuntu: Triaged Bug description: In Oneiric Release, The volume slider randomly jump down a notch or two for fraction of a second, even when there is no audio playing on the system. If mute is selected, the menu will quickly flip out of mute mode and back again. This change actually affects the audio output, resulting in pops correlated with the volume changes. nVidia GF106 Audio Controller --- AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 1.23-0ubuntu4 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC892 Analog [ALC892 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jfrorie 9959 F.... pulseaudio Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xfb9f8000 irq 54' Mixer name : 'Realtek ALC892' Components : 'HDA:10ec0892,1462522c,00100302' Controls : 35 Simple ctrls : 20 Card2.Amixer.info: Card hw:2 'Generic'/'HD-Audio Generic at 0xfbcf8000 irq 55' Mixer name : 'ATI R6xx HDMI' Components : 'HDA:1002aa01,00aa0100,00100200' Controls : 4 Simple ctrls : 1 Card2.Amixer.values: Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] DistroRelease: Ubuntu 11.10 InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007) Package: pulseaudio 1:1.0-0ubuntu3.1 PackageArchitecture: amd64 ProcEnviron: PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9 Tags: oneiric running-unity Uname: Linux 3.0.0-14-generic x86_64 UpgradeStatus: Upgraded to oneiric on 2011-10-14 (82 days ago) UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare dmi.bios.date: 11/16/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: V25.0 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: X58A-GD45 (MS-7522) dmi.board.vendor: MSI dmi.board.version: 5.0 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD dmi.chassis.version: 5.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV25.0:bd11/16/2010:svnMSI:pnMS-7522:pvr5.0:rvnMSI:rnX58A-GD45(MS-7522):rvr5.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr5.0: dmi.product.name: MS-7522 dmi.product.version: 5.0 dmi.sys.vendor: MSI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/874535/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
