** Description changed:

  HWE kernel appears to get more amdgpu MST related WARNINGs and Oopses than 
non-HWE, mostly after resume from blanking or suspend.
  Kernel logs for most recent one attached.
  
- $ journalctl -b -1 -k | egrep -v 'audit|dbus-daemon' > /tmp/oops20210428.txt
- $ fgrep RIP /tmp/oops20210428.txt
- Apr 26 09:06:11 ub3ff kernel: RIP: 0010:dcn20_validate_bandwidth_fp+0x9d/0xf0 
[amdgpu]
- Apr 26 09:06:11 ub3ff kernel: RIP: 0010:dcn10_get_dig_frontend+0x93/0xc0 
[amdgpu]
- Apr 28 08:23:04 ub3ff kernel: RIP: 
0010:dc_link_allocate_mst_payload+0x1c9/0x1e0 [amdgpu]
- Apr 28 08:23:04 ub3ff kernel: RIP: 0033:0x7fe6953a550b
- Apr 28 08:24:02 ub3ff kernel: RIP: 0010:dc_link_add_remote_sink+0x65/0x110 
[amdgpu]
- Apr 28 08:24:02 ub3ff kernel: RIP: 0033:0x7fe6953a550b
- Apr 28 08:24:02 ub3ff kernel: RIP: 0010:dm_dp_mst_get_modes+0xd9/0x210 
[amdgpu]
- Apr 28 08:24:02 ub3ff kernel: RIP: 0033:0x7fe6953a550b
- Apr 28 08:24:02 ub3ff kernel: RIP: 0010:dm_dp_mst_get_modes+0xd9/0x210 
[amdgpu]
+ $ journalctl -b -1 -k | egrep -v 'audit|dbus-daemon' > oops20210428.txt
+ $ fgrep RIP oops20210428.txt | cut -c 31-
+ RIP: 0010:dcn20_validate_bandwidth_fp+0x9d/0xf0 [amdgpu]
+ RIP: 0010:dcn10_get_dig_frontend+0x93/0xc0 [amdgpu]
+ RIP: 0010:dc_link_allocate_mst_payload+0x1c9/0x1e0 [amdgpu]
+ RIP: 0033:0x7fe6953a550b
+ RIP: 0010:dc_link_add_remote_sink+0x65/0x110 [amdgpu]
+ RIP: 0033:0x7fe6953a550b
+ RIP: 0010:dm_dp_mst_get_modes+0xd9/0x210 [amdgpu]
+ RIP: 0033:0x7fe6953a550b
+ RIP: 0010:dm_dp_mst_get_modes+0xd9/0x210 [amdgpu]
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.8.0-50-generic 5.8.0-50.56~20.04.1
  ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-50-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 28 08:43:08 2021
  InstallationDate: Installed on 2020-04-10 (382 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  SourcePackage: linux-signed-hwe-5.8
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1926400

Title:
  amdgpu with mst WARNING and Kernel Oops on blanking/resume

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