[ThinkPad X1 Carbon 6th] Crackling sound with HDMI

Bug #1830867 reported by Edouard Richard on 2019-05-29

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This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
pulseaudio (Ubuntu)

Bug Description


I have a new laptop and I cannot manage to have a clean and stable sound with HDMI.
It happens every time I play a track on Spotify (desktop and web), sometimes from a VLC radio or a youtube video, never from a video with VLC yet.

I'm attaching a record of what I hear when I play a track from Spotify.

I created two reports.

One during a Spotify playing, when it is crackling and after the sound started to crackle everywhere:

Another after a fresh reboot, where the sound is correct with at least YouTube:

Just after this last report, the sound is still crackling with Spotify and VLC radio. Not with Youtube.

A diff on theses files gives some differences I find suspect. Are there expected ?

Do you have an idea where the problem comes from ?

Thank you for your support !

ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
 /dev/snd/controlC0: edouard 1677 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 19.04
InstallationDate: Installed on 2019-05-28 (0 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
Package: pulseaudio 1:12.2-2ubuntu3
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 5.0.0-15.16-generic 5.0.6
Tags: disco
Uname: Linux 5.0.0-15-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 04/20/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N23ET63W (1.38 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20KHCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN23ET63W(1.38):bd04/20/2019:svnLENOVO:pn20KHCTO1WW:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KHCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 6th
dmi.product.name: 20KHCTO1WW
dmi.product.sku: LENOVO_MT_20KH_BU_Think_FM_ThinkPad X1 Carbon 6th
dmi.product.version: ThinkPad X1 Carbon 6th
dmi.sys.vendor: LENOVO
modified.conffile..etc.pulse.default.pa: [modified]
mtime.conffile..etc.pulse.default.pa: 2019-05-28T23:16:01.413832

Edouard Richard (vied12) wrote :
Daniel van Vugt (vanvugt) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:

apport-collect 1830867

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

Changed in pulseaudio (Ubuntu):
status: New → Incomplete

apport information

tags: added: apport-collected disco
description: updated

apport information

apport information

apport information

apport information

apport information

Daniel van Vugt (vanvugt) wrote :


This may be related to bug 1827440, which is the same hardware but sounds like a slightly different problem.

summary: - Crackling sound with HDMI
+ [ThinkPad X1 Carbon 6th] Crackling sound with HDMI
Changed in pulseaudio (Ubuntu):
status: Incomplete → New

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1830867

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Edouard Richard (vied12) on 2019-05-29
Changed in linux (Ubuntu):
status: Incomplete → Confirmed
Edouard Richard (vied12) on 2019-07-11
Changed in linux (Ubuntu):
status: Confirmed → New
Changed in linux (Ubuntu):
status: New → Incomplete
Changed in pulseaudio (Ubuntu):
status: New → Incomplete
Brad Figg (brad-figg) on 2019-07-24
tags: added: ubuntu-certified
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