Public bug reported:
Sound works on with 20.04 on the Thinkpad T490s, but sound quality is
noticeably worse than on Windows. It looks like the same bug here:
https://bugs.launchpad.net/ubuntu/+source/alsa-ucm-conf/+bug/1872108
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.8.0-41.46~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-41-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: hmahmood 1360 F.... pulseaudio
/dev/snd/pcmC0D0p: hmahmood 1360 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 31 19:14:57 2021
InstallationDate: Installed on 2021-01-30 (1 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
PackageArchitecture: all
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Speaker, Internal
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: None of the above
Title: [20NYS83800, Realtek ALC257, Speaker, Internal] Playback problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/31/2020
dmi.bios.release: 1.70
dmi.bios.vendor: LENOVO
dmi.bios.version: N2JET92W (1.70 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20NYS83800
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.20
dmi.modalias:
dmi:bvnLENOVO:bvrN2JET92W(1.70):bd08/31/2020:br1.70:efr1.20:svnLENOVO:pn20NYS83800:pvrThinkPadT490s:rvnLENOVO:rn20NYS83800:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T490s
dmi.product.name: 20NYS83800
dmi.product.sku: LENOVO_MT_20NY_BU_Think_FM_ThinkPad T490s
dmi.product.version: ThinkPad T490s
dmi.sys.vendor: LENOVO
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1913977
Title:
Bad sound quality (no bass) on Thinkpad T490s
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