[Bug 1942619] Re: WARNING: ... decide_link_settings+0x1ab/0x1d0 [amdgpu]

This happened again today. I have discovered that recovery by
suspend/resume is possible.

** Summary changed:

- WARNING: CPU: 11 PID: 3608 at drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:2529 decide_link_settings+0x1ab/0x1d0 [amdgpu]
+ WARNING: ... decide_link_settings+0x1ab/0x1d0 [amdgpu]

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Title:
WARNING: ... decide_link_settings+0x1ab/0x1d0 [amdgpu]

Status in linux package in Ubuntu:
Confirmed

Bug description:
This has hit me twice in the last 24 hours.

Displays come in and out of power saving, without actually displaying
anything. The console doesn't become usable. It seems to be
unrecoverable, shutdown gets stuck somewhere and I end up having to
hit the reset button.

This is a desktop machine, which suspends frequently, usually without issue.
Radeon RX 570, dual monitor, display link

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-generic 5.11.0.31.33
ProcVersionSignature: Ubuntu 5.11.0-31.33-generic 5.11.22
Uname: Linux 5.11.0-31-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri Sep 3 10:11:35 2021
InstallationDate: Installed on 2019-06-18 (808 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-31-generic root=/dev/mapper/infodata-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.11.0-31-generic N/A
linux-backports-modules-5.11.0-31-generic N/A
linux-firmware 1.197.3
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to hirsute on 2021-05-09 (116 days ago)
dmi.bios.date: 11/27/2019
dmi.bios.release: 5.14
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.90
dmi.board.name: B450M Steel Legend
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.:bvrP2.90:bd11/27/2019:br5.14:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB450MSteelLegend: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.

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