I was supporting another Xubuntu 19.10 user on AMD Ryzen 3 2200G
(Gigabyte Technology Co., Ltd. B450 AORUS M/B450 AORUS M, BIOS F2
08/08/2018) today, whose log of a failed (standard) boot (to black
screen) showed

kernel: WARNING: CPU: 2 PID: 255 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c:932
dcn10_verify_allow_pstate_change_high.cold+0xc/0x23d [amdgpu]

which seems to be discussed at
https://bugs.freedesktop.org/show_bug.cgi?id=109628

** Bug watch added: freedesktop.org Bugzilla #109628
   https://bugs.freedesktop.org/show_bug.cgi?id=109628

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https://bugs.launchpad.net/bugs/1848900

Title:
  Blank display with Eoan Ermine live DVD on Ryzen 3 2200G

Status in xorg package in Ubuntu:
  New

Bug description:
  Regression with Ryzen 3 2200G, UEFI Asrock B450 Pro4 motherboard and
  55-75 Hz monitor.

  Booting Xubuntu 19.10 live iso with safe graphics options did give a
  stable desktop display, but

  xubuntu@xubuntu:~$ xrandr
  xrandr: Failed to get size of gamma for output default
  Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
  default connected 1920x1080+0+0 0mm x 0mm
     1920x1080     77.00* 
  xubuntu@xubuntu:~$ 

  The monitor is only supposed to have a maximum vertical refresh rate
  of 75 Hz. Xrandr reports 77 Hz as the only choice.  The monitor
  reports 60 Hz, not that I trust the monitor.

  Swapping monitors and running many reboots the situation seems to
  be...

  Old versions of Ubuntu (Bionic and Dingo) can handle the hardware.
  Standard boot sometimes gives a blank screen.  
  Standard boot sometimes gives a badly pixelated display 
  (Ctl-Alt-F6, Ctl-Alt-F7 temporarily improves it).  
  Connecting a 144 Hz monitor convinces something (the firmware?) 
  that fast refreshes are OK on a slow monitor, or at least it fails to 
  reread and abide by the slow monitor's limitations when swapping back.    
  Something, I don't know what, convinces the computer to run the display 
  at 60 Hz, sometimes. 

  The motherboard has three video ports; DP, HDMI and VGA (using an onboard 
  DP? to VGA converter chip).  The fast monitor has DP, HDMI and VGA ports, 
  but I only experimented with the DP connection.  The slow monitor has VGA and 
  DVI-D ports.  I experimented with VGA to VGA and HDMI via a passive adapter 
  to DVI.  When running in the badly pixelated mode xorg seems to think that 
  the VGA port is "DP-1".

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: xorg 1:7.7+19ubuntu12
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperVersion: 1.427
  CompositorRunning: None
  CurrentDesktop: XFCE
  Date: Sun Oct 20 00:17:34 2019
  DistUpgraded: Fresh install
  DistroCodename: eoan
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / 
Radeon Vega Mobile Series] [1002:15dd] (rev c8) (prog-if 00 [VGA controller])
     Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega 
Series / Radeon Vega Mobile Series] [1002:15dd]
  LiveMediaBuild: Xubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz 
file=/cdrom/preseed/username.seed quiet splash nomodeset ---
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/02/2019
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P3.40
  dmi.board.name: B450 Pro4
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP3.40:bd07/02/2019:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB450Pro4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.sku: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.99-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20190815-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
  xserver.bootTime: Sat Oct 19 23:52:52 2019
  xserver.configfile: default
  xserver.errors:
   open /dev/dri/card0: No such file or directory
   open /dev/dri/card0: No such file or directory
   Screen 0 deleted because of no matching config section.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.20.5+git20191008-0ubuntu1

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