Public bug reported:

The bug is similar to this one:

But on UX490UA there is even no sound from headphones. I tried some
fixes recommended for UX390, but none of them worked.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.10.0-30.34-generic 4.10.17
Uname: Linux 4.10.0-30-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
 /dev/snd/controlC0:  simon     1348 F.... pulseaudio
CurrentDesktop: GNOME
Date: Thu Aug 10 21:05:39 2017
InstallationDate: Installed on 2017-08-10 (0 days ago)
InstallationMedia: Ubuntu-GNOME 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: Speaker, Internal
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [UX490UA, Realtek ALC295, Speaker, Internal] Underruns, dropouts or 
crackling sound
UpgradeStatus: No upgrade log present (probably fresh install) 06/07/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: UX490UA.302
dmi.board.asset.tag: ATN12345678901234567 UX490UA
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:bvnAmericanMegatrendsInc.:bvrUX490UA.302:bd06/07/2017:svnASUSTeKCOMPUTERINC.:pnUX490UA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX490UA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: UX490UA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug zesty

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  [UX490UA, Realtek ALC295] Scratchy sound from speakers and no output
  from headphones

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