Public bug reported:

suspend to ram crashes amdgpu.
System is still accessible via SSH after resume from standby.
Happens when X is running (gdm/gnome with 3d acceleration) and also when X is 
stopped.

I'll attach the dmesg output of several attempts.
This is the hardware:
https://store.hp.com/GermanyStore/Merch/Product.aspx?id=9YN58EA&opt=ABD&sel=NTB

Please let me know if I can help tracking this down.
I'm a software developer (sadly not a kernel developer), so you can ask dirty 
technical questions ;-)

Workaround:
Enable hibernation (suspend to disk) and use instead of suspend to ram.

What didn't helped:
Kernel parameters (some actually prevented the system from booting): 
no_console_suspend nomodeset amdgpu.gpu_recovery=1 init_on_free=0 idle=nowait 
amd_iommu=flush
echo mem > /sys/power/state
systemctl start suspend.target
echo 0 > /sys/power/pm_async

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.6.0-1010.10-oem 5.6.8
Uname: Linux 5.6.0-1010-oem x86_64
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun May 31 18:43:54 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GpuHangFrequency: Continuously
GpuHangReproducibility: Yes, I can easily reproduce it
GpuHangStarted: Immediately after installing this version of Ubuntu
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev c1) (prog-if 
00 [VGA controller])
   Subsystem: Hewlett-Packard Company Picasso [103c:85de]
InstallationDate: Installed on 2020-05-29 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: HP HP ENVY x360 Convertible 13-ar0xxx
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.6.0-1010-oem 
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/26/2019
dmi.bios.vendor: AMI
dmi.bios.version: F.19
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 85DE
dmi.board.vendor: HP
dmi.board.version: 41.36
dmi.chassis.type: 31
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAMI:bvrF.19:bd12/26/2019:svnHP:pnHPENVYx360Convertible13-ar0xxx:pvr:rvnHP:rn85DE:rvr41.36:cvnHP:ct31:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Envy
dmi.product.name: HP ENVY x360 Convertible 13-ar0xxx
dmi.product.sku: 9YN58EA#ABD
dmi.sys.vendor: HP
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 amdgpu apport-bug focal freeze ubuntu

** Summary changed:

- suspend to ram (standby) crashes amdgpu
+ suspend to ram (standby) crashes amdgpu (Ryzen-7 Vega - HP Envy x360)

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1881494

Title:
  suspend to ram (standby) crashes amdgpu (Ryzen-7 Vega - HP Envy x360)

Status in xorg package in Ubuntu:
  New

Bug description:
  suspend to ram crashes amdgpu.
  System is still accessible via SSH after resume from standby.
  Happens when X is running (gdm/gnome with 3d acceleration) and also when X is 
stopped.

  I'll attach the dmesg output of several attempts.
  This is the hardware:
  
https://store.hp.com/GermanyStore/Merch/Product.aspx?id=9YN58EA&opt=ABD&sel=NTB

  Please let me know if I can help tracking this down.
  I'm a software developer (sadly not a kernel developer), so you can ask dirty 
technical questions ;-)

  Workaround:
  Enable hibernation (suspend to disk) and use instead of suspend to ram.

  What didn't helped:
  Kernel parameters (some actually prevented the system from booting): 
no_console_suspend nomodeset amdgpu.gpu_recovery=1 init_on_free=0 idle=nowait 
amd_iommu=flush
  echo mem > /sys/power/state
  systemctl start suspend.target
  echo 0 > /sys/power/pm_async

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.6.0-1010.10-oem 5.6.8
  Uname: Linux 5.6.0-1010-oem x86_64
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Sun May 31 18:43:54 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GpuHangFrequency: Continuously
  GpuHangReproducibility: Yes, I can easily reproduce it
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev c1) (prog-if 
00 [VGA controller])
     Subsystem: Hewlett-Packard Company Picasso [103c:85de]
  InstallationDate: Installed on 2020-05-29 (1 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: HP HP ENVY x360 Convertible 13-ar0xxx
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.6.0-1010-oem 
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/26/2019
  dmi.bios.vendor: AMI
  dmi.bios.version: F.19
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 85DE
  dmi.board.vendor: HP
  dmi.board.version: 41.36
  dmi.chassis.type: 31
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAMI:bvrF.19:bd12/26/2019:svnHP:pnHPENVYx360Convertible13-ar0xxx:pvr:rvnHP:rn85DE:rvr41.36:cvnHP:ct31:cvrChassisVersion:
  dmi.product.family: 103C_5335KV HP Envy
  dmi.product.name: HP ENVY x360 Convertible 13-ar0xxx
  dmi.product.sku: 9YN58EA#ABD
  dmi.sys.vendor: HP
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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