Ah, that's because the model name wasn't included in kernel v4.18. Please use 
mainline kernel [1]
with the kernel parameter.

[1] https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1-rc2/

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  No sound output on Zen AIO 27 Z272SD_Z272SD

Status in linux package in Ubuntu:

Bug description:
  I find this to be an issue with current LTS 18.04's latest 4.19
  kernel.  I tested this on mainline 4.20 and 5.0 kernels as well.

  No audio because ALC274 not properly loaded for use, so no audio
  output.  A related card had a similar bug, which was fixed, and may be
  of use in resolving this one:

  # cat /proc/asound/card0/codec* | grep Codec
  Codec: Realtek ALC274
  Codec: Intel Kabylake HDMI

  # cat /proc/asound/card0/pcm0c/info
  card: 0
  device: 0
  subdevice: 0
  stream: CAPTURE
  id: ALC274 Analog
  name: ALC274 Analog
  subname: subdevice #0
  class: 0
  subclass: 0
  subdevices_count: 1
  subdevices_avail: 0

  aplay -l
  **** List of PLAYBACK Hardware Devices ****
  card 0: PCH [HDA Intel PCH], device 0: ALC274 Analog [ALC274 Analog]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: PCH [HDA Intel PCH], device 10: HDMI 4 [HDMI 4]
    Subdevices: 1/1
    Subdevice #0: subdevice #0

  d# hwinfo --sound
  21: PCI 1f.3: 0403 Audio device                                 
    [Created at pci.378]
    Unique ID: nS1_.WnojYJLVCm0
    SysFS ID: /devices/pci0000:00/0000:00:1f.3
    SysFS BusID: 0000:00:1f.3
    Hardware Class: sound
    Model: "Intel Audio device"
    Vendor: pci 0x8086 "Intel Corporation"
    Device: pci 0xa348 
    SubVendor: pci 0x1043 "ASUSTeK Computer Inc."
    SubDevice: pci 0x31d0 
    Revision: 0x10
    Driver: "snd_hda_intel"
    Driver Modules: "snd_hda_intel"
    Memory Range: 0xdd398000-0xdd39bfff (rw,non-prefetchable)
    Memory Range: 0xdd100000-0xdd1fffff (rw,non-prefetchable)
    IRQ: 145 (663 events)
    Module Alias: "pci:v00008086d0000A348sv00001043sd000031D0bc04sc03i80"
    Driver Info #0:
      Driver Status: snd_hda_intel is active
      Driver Activation Cmd: "modprobe snd_hda_intel"
    Config Status: cfg=new, avail=yes, need=no, active=unknown
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
   /dev/snd/controlC0:  gdm        1903 F.... pulseaudio
                        derek      2464 F.... pulseaudio
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2019-03-23 (5 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 
  MachineType: ASUSTeK COMPUTER INC. Zen AIO 27 Z272SD_Z272SD
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: linux (not installed)
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-16-generic 
root=UUID=a3d569a1-6262-4609-b2f5-199dbabf57cb ro quiet splash
  ProcVersionSignature: Ubuntu 4.18.0-16.17~18.04.1-generic 4.18.20
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-4.18.0-16-generic N/A
   linux-backports-modules-4.18.0-16-generic  N/A
   linux-firmware                             1.173.3
  Tags:  bionic
  Uname: Linux 4.18.0-16-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  _MarkForUpload: True
  dmi.bios.date: 09/26/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: Z272SD.300
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: Z272SD
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 13
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.product.family: Zen AIO
  dmi.product.name: Zen AIO 27 Z272SD_Z272SD
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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