This started after buying and installing new cpu, AMD Ryzen 2400g, on
new motherboard. So no previous history available.

Now reading Kernel Mainline Builds, will have a bash... keep you posted

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  Error messages during boot - Ubuntu 18.04 & Mint19

Status in linux package in Ubuntu:

Bug description:
  This came about as I had problems with efi while installing a dual
  boot of ubuntu and linux mint.

  As I understand it, during the boot process, the kernel sees a cpu
  count for the processor chip , AMD Ryzen 2400G, as 8 but 4 of them are
  graphics compute units. A little later in the process, the graphics
  processors cause errors.

  Subsequent to discovering this , I have added a line to grub
  GRUB_CMDLINE_LINUX_ which appears to have improved the boot process.
  It is 'ruc_nocbs=0-3'. The alteration in grub seems to help limit the
  cpu count and gets the boot process over the bump.

  I searched the interweb for clues and this seems to be a successful
  experiment. I am reporting this because I could not find any pertinent
  reference to this sort of problem with this particular chip. This
  search was not exhaustive so I hope I am not wasting your time :)

  I am attaching a file of concatenated system info for kernel reports
  as the options on this page only appear to allow one file to be

   Most of this was my lack of understanding the efi requirements, but
  the lack of useful information in the Gigabyte motherboard manual
  about how the UEFI operation was managed by its operating system
  prolonged my agony.:)

  I hope this helps, thank you and keep up the fantastic work

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-22-generic 4.15.0-22.24
  ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
  Uname: Linux 4.15.0-22-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
   /dev/snd/controlC1:  tpf        1528 F.... pulseaudio
   /dev/snd/controlC0:  tpf        1528 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jun 12 09:38:39 2018
  HibernationDevice: RESUME=UUID=150c1cd8-2246-4c18-b40e-dc07d8425777
  InstallationDate: Installed on 2018-06-10 (1 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: Gigabyte Technology Co., Ltd. AB350N-Gaming WIFI
   PATH=(custom, no user)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-22-generic 
root=UUID=36d43481-0720-4808-a234-82941b71f750 ro quiet splash
   linux-restricted-modules-4.15.0-22-generic N/A
   linux-backports-modules-4.15.0-22-generic  N/A
   linux-firmware                             1.173.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install) 04/17/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F23d
  dmi.board.asset.tag: Default string AB350N-Gaming WIFI-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
dmi:bvnAmericanMegatrendsInc.:bvrF23d:bd04/17/2018:svnGigabyteTechnologyCo.,Ltd.:pnAB350N-GamingWIFI:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnAB350N-GamingWIFI-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring: Default string AB350N-Gaming WIFI
  dmi.product.version: Default string
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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