[N501VW, Realtek ALC668, Black Headphone Out, Right] Underruns, dropouts or crackling sound

[Etienneo]

1. This bug happens everytime my computer wake up from sleep: a loud crackling noise can be heard from headphones but not from laptop speakers
2. It disappears after reboot and audio works perfectly both through laptop speakers and headphones
3. Bringing the output volume to 0 doesn't make the crackling sound disappear
4. Bringing microphone volume to 0 doesn't make the crackling sound disappear
5. This bug was not present in the previous version of Ubuntu used on this computer ie. 17.04.

Additionnaly, headphones contain a built-in microphone.

```lsb_release -rd
Description: Ubuntu 17.10
Release: 17.10
```

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
Uname: Linux 4.13.0-17-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: etienne 5390 F...m pulseaudio
 /dev/snd/controlC0: etienne 5390 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Fri Dec 15 10:44:27 2017
InstallationDate: Installed on 2017-05-22 (206 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Black Headphone Out, Right
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [N501VW, Realtek ALC668, Black Headphone Out, Right] Underruns, dropouts or crackling sound
UpgradeStatus: Upgraded to artful on 2017-11-26 (18 days ago)
dmi.bios.date: 11/28/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: N501VW.304
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: N501VW
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN501VW.304:bd11/28/2016:svnASUSTeKCOMPUTERINC.:pnN501VW:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN501VW:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: N
dmi.product.name: N501VW
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 17.10 (artful) reached end-of-life on July 19, 2018.

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. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.