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:
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
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
USER PID ACCESS COMMAND
/dev/snd/controlC1: tpf 1528 F.... pulseaudio
/dev/snd/controlC0: tpf 1528 F.... pulseaudio
Date: Tue Jun 12 09:38:39 2018
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
root=UUID=36d43481-0720-4808-a234-82941b71f750 ro quiet splash
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.vendor: American Megatrends Inc.
dmi.board.asset.tag: Default string
dmi.board.name: AB350N-Gaming WIFI-CF
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.asset.tag: Default string
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.product.family: Default string
dmi.product.name: AB350N-Gaming WIFI
dmi.product.version: Default string
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
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