That can currently be found at least in amdgpu proprietary driver
19.50-969691, so you may want to download that from AMD's support site,
and extract that firmware blob from extracted amdgpu-dkms deb.

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https://bugs.launchpad.net/bugs/1857348

Title:
  amdgpu crashes badly

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I'm running current ubuntu 19.10 with kernel "Ubuntu
  5.3.0-24.26-generic 5.3.10" on a ThinkPad T495 laptop, which is
  confirmed to be certified here:
  https://certification.ubuntu.com/hardware/201905-27049

  Unfortunately, the experience is really bad: `amdgpu` driver in the
  kernel crashes sometimes. I managed to get the `dmesg` output, please
  see atachemnt. This is confirmed at least on linux-image-5.3.0-18 and
  linux-image-5.3.0-24 "linux-image-X-generic

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: linux-image-generic 5.3.0.24.28
  ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
  Uname: Linux 5.3.0-24-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  Date: Mon Dec 23 14:50:14 2019
  InstallationDate: Installed on 2019-12-07 (16 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  MachineType: LENOVO 20NJ0010PB
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-24-generic 
root=/dev/mapper/ubuntu--vg-rootfs ro rootflags=subvol=@ quiet splash 
vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-5.3.0-24-generic N/A
   linux-backports-modules-5.3.0-24-generic  N/A
   linux-firmware                            1.183.3
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/28/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R12ET46W(1.16 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20NJ0010PB
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrR12ET46W(1.16):bd10/28/2019:svnLENOVO:pn20NJ0010PB:pvrThinkPadT495:rvnLENOVO:rn20NJ0010PB:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T495
  dmi.product.name: 20NJ0010PB
  dmi.product.sku: LENOVO_MT_20NJ_BU_Think_FM_ThinkPad T495
  dmi.product.version: ThinkPad T495
  dmi.sys.vendor: LENOVO

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