Please add kernel parameter "blacklist=amdgpu", and boot with mainline kernel.
Once you can use shell, run `modprobe amdgpu` to see if any trace/panic can be 
seen. You may want to use SSH to do this.

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  [Medion MS-7616] [drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables
  amdgpu kernel modesetting.

Status in linux package in Ubuntu:

Bug description:
  I cannot boot PC normally, i must use recovery mode.

  WORKAROUND: Use kernel parameter:

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: xserver-xorg-video-amdgpu 18.1.99+git20190207-1
  ProcVersionSignature: Ubuntu 5.0.0-7.8-lowlatency 5.0.0
  Uname: Linux 5.0.0-7-lowlatency x86_64

  ApportVersion: 2.20.10-0ubuntu21
  Architecture: amd64
  CompizPlugins: No value set for 
  CompositorRunning: None
  CurrentDesktop: XFCE
  Date: Tue Mar  5 00:59:48 2019
  DistUpgraded: 2019-02-07 01:41:15,390 DEBUG Running PostInstallScript: 
  DistroCodename: disco
  DistroVariant: ubuntu
   Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 
470/480/570/570X/580/580X] [1002:67df] (rev cf) (prog-if 00 [VGA controller])
     Subsystem: PC Partner Limited / Sapphire Technology Ellesmere [Radeon RX 
470/480/570/570X/580/580X/590] [174b:353e]
  InstallationDate: Installed on 2012-02-27 (2562 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: MEDIONPC MS-7616
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-7-lowlatency 
root=UUID=cded073e-f845-4947-970b-f8a4290c4c2b ro quiet splash acpi_osi=Linux 
nomodeset crashkernel=384M-:128M crashkernel=384M-2G:128M,2G-:256M 
crashkernel=512M-:192M vt.handoff=1
  SourcePackage: xserver-xorg-video-amdgpu
  UpgradeStatus: Upgraded to disco on 2019-02-07 (25 days ago) 01/15/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: A7616MLN.10F
  dmi.board.asset.tag: To Be Filled By O.E.M. MS-7616
  dmi.board.vendor: MEDIONPC
  dmi.board.version: 1.0
  dmi.chassis.type: 3
  dmi.chassis.vendor: MEDIONPC
dmi:bvnAmericanMegatrendsInc.:bvrA7616MLN.10F:bd01/15/2010:svnMEDIONPC:pnMS-7616:pvr1.0:rvnMEDIONPC:rnMS-7616:rvr1.0:cvnMEDIONPC:ct3:cvr: To Be Filled By O.E.M. MS-7616
  dmi.product.sku: To Be Filled By O.E.M.
  dmi.product.version: 1.0
  dmi.sys.vendor: MEDIONPC
  version.compiz: compiz 1:
  version.libdrm2: libdrm2 2.4.97-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.3.4-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.3.4-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.3-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.99+git20190207-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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