The issue reproduces on Eoan final release version.

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  [ThinkPad X1 Yoga 4th Gen][20QGZ4MTUS, Realtek ALC285, Speaker,
  Internal] The Volume remains the same value.

Status in alsa-driver package in Ubuntu:

Bug description:
  [Steps to reproduce]
  1. Install Ubuntu 19.10 on ThinkPad X1 Yoga 4th Gen
  2. Login system
  3. Navigate to 'System Settings' -> 'Sound'
  4. Adjust the 'System Volume' bar and verify the sound result
  5. Press 'F2 and F3' to adjust system volume

  [Expected result]
  System volume should be heard with several sound level.

  [Actual result]
  No matter what adjusted, the volume remains the same value.

  Navigate to 'System Settings' -> 'Sound' -> 'Over-Amplification', turn it 'On'
  Then adjust the sound, we could hear the different volume value beyond 100%, 
but it could remains the same value from 0 ~ 100%

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
  Uname: Linux 5.3.0-13-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
   /dev/snd/controlC0:  u          1747 F.... pulseaudio
   /dev/snd/pcmC0D0p:   u          1747 F...m pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Oct 11 12:01:52 2019
  InstallationDate: Installed on 2019-10-09 (1 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Beta amd64 (20190926)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Speaker, Internal
   10月 11 10:57:40 u-ThinkPad-X1-Yoga-4th dbus-daemon[745]: [system] Activating 
via systemd: service name='org.freedesktop.RealtimeKit1' 
unit='rtkit-daemon.service' requested by ':1.36' (uid=124 pid=952 
comm="/usr/bin/pulseaudio --daemonize=no " label="unconfined")
   10月 11 10:57:57 u-ThinkPad-X1-Yoga-4th systemd[938]: pulseaudio.service: 
   10月 11 10:57:59 u-ThinkPad-X1-Yoga-4th dbus-daemon[745]: [system] Rejected 
send message, 2 matched rules; type="method_call", sender=":1.785" (uid=124 
pid=2441 comm="/usr/bin/pulseaudio --daemonize=no " label="unconfined") 
interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" error 
name="(unset)" requested_reply="0" destination="org.bluez" (uid=0 pid=734 
comm="/usr/lib/bluetooth/bluetoothd " label="unconfined")
   10月 11 10:58:07 u-ThinkPad-X1-Yoga-4th systemd[938]: pulseaudio.service: 
   10月 11 10:58:07 u-ThinkPad-X1-Yoga-4th systemd[938]: pulseaudio.socket: 
  Symptom_Type: Volume slider, or mixer problems
  Title: [20QGZ4MTUS, Realtek ALC285, Speaker, Internal] volume slider problem
  UpgradeStatus: No upgrade log present (probably fresh install) 10/04/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N2HET39W (1.22 )
  dmi.board.asset.tag: Not Available 20QGZ4MTUS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 31
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
dmi:bvnLENOVO:bvrN2HET39W(1.22):bd10/04/2019:svnLENOVO:pn20QGZ4MTUS:pvrThinkPadX1Yoga4th:rvnLENOVO:rn20QGZ4MTUS:rvrSDK0J40697WIN:cvnLENOVO:ct31:cvrNone: ThinkPad X1 Yoga 4th 20QGZ4MTUS
  dmi.product.sku: LENOVO_MT_20QG_BU_Think_FM_ThinkPad X1 Yoga 4th
  dmi.product.version: ThinkPad X1 Yoga 4th
  dmi.sys.vendor: LENOVO

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