Sound stops working

[Paul Gear]

My fully working sound configuration occasionally stops working. Symptoms are:
- System Settings -> Sound only shows "dummy output" and no input devices
- restarting pulseaudio has no effect
- aplay -l as root shows sound cards
- fuser -v /dev/snd/* shows nothing; /dev/dsp and /dev/seq do not exist
- Rebooting solves the problem

This did not occur on trusty but has occurred twice on utopic in the last month or two.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: pulseaudio 1:4.0-0ubuntu22
Uname: Linux 3.17.1-031701-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D3', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/controlC29', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: Unity
Date: Fri Dec 19 12:40:29 2014
SourcePackage: pulseaudio
Symptom: audio
Symptom_Card: HDA-Intel - HDA Intel PCH
Symptom_Jack: Digital Out, HDMI
Title: [qqqqCTO, Intel PantherPoint HDMI, Digital Out, HDMI] Pulseaudio fails to detect card
UpgradeStatus: Upgraded to utopic on 2014-11-10 (38 days ago)
dmi.bios.date: 07/24/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: G2ET33WW (1.13 )
dmi.board.asset.tag: Not Available
dmi.board.name: qqqqCTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG2ET33WW(1.13):bd07/24/2012:svnLENOVO:pnqqqqCTO:pvrThinkPadX230:rvnLENOVO:rnqqqqCTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: qqqqCTO
dmi.product.version: ThinkPad X230
dmi.sys.vendor: LENOVO

[Paul Gear (paulgear)]

One more symptom - this syslog message occurred around the time sound stopped working, and hasn't occurred since:

Dec 19 08:36:02 peleg pulseaudio[4950]: [pulseaudio] sink-input.c: Failed to create sink input: sink is suspended.

[Raymond (superquad-vortex2)]

Default sink name: auto_null
Default source name: auto_null.monitor

you have to provide pulseaudio verbose log and system before suspend and resume

seem auto null was selected when your sound card cannot resume

[Paul Gear (paulgear)]

Hi Raymond,

I'm experiencing this problem again now, and the symptoms have changed slightly. Sound is still not working, but the input and output devices Internal Microphone (built-in audio) and Speakers (built-in audio) are still present. Would gathering debug information at the moment help?

Thanks,
Paul

[Raymond (superquad-vortex2)]

did this happen when there are two or more user login since first user 's pulseaudio accquire the sound card and second user ' pulseaudio cannot open the sound card any more ?

sudo fuser /dev/snd/*

[Raymond (superquad-vortex2)]

client(s) logged in.
    index: 0
 driver: <module-systemd-login.c>
 owner module: 15
 properties:
  application.name = "Login Session c3"
  systemd-login.session = "c3"
    index: 1
 driver: <module-systemd-login.c>
 owner module: 15
 properties:
  application.name = "Login Session c2"
  systemd-login.session = "c2"
    index: 2

[Paul Gear (paulgear)]

@superquad-vortex2: This is my personal laptop; if there is ever any other user logged in, it is me via the text console. I suspect the log you've pasted above is showing old stale sessions. I've rebooted now to add a kernel update, so I can gather any information about the working state you need now. What needs collecting?

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 14.10 (utopic) reached end-of-life on July 23, 2015.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test.

[Launchpad Janitor (janitor)]

[Expired for pulseaudio (Ubuntu) because there has been no activity for 60 days.]