The problem is observed while debugging lp:1955720. The AMD RX 640 fails to work in kernel 5.14 and even the latest 5.17-rc. After kernel bisecting, I found disabling ASPM (reverting commit 0064b0ce85bb ("drm/amd/pm: enable ASPM by default")) can display w/o problem. However, the display seems to respond very slow to keyboard/mouse input.
Created a bug on https://gitlab.freedesktop.org/drm/amd/-/issues/1907 for tracking.
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ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: u 2050 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistributionChannelDescriptor:
# This is the distribution channel descriptor for the OEM CDs
# For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-focal-amd64-20200502-85+fossa-rockruff-adl+X163
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2021-12-28 (49 days ago)
InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary 20200502-05:58
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
Bus 001 Device 002: ID 04ca:007d Lite-On Technology Corp. USB wired keyboard
Bus 001 Device 004: ID 8087:0033 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. OptiPlex 7000
Package: linux (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 i915
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.14.0-1015-oem root=UUID=b7ac316b-ae2d-4f2c-b9bf-004de7577916 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.14.0-1015.15-oem 5.14.20
RelatedPackageVersions:
linux-restricted-modules-5.14.0-1015-oem N/A
linux-backports-modules-5.14.0-1015-oem N/A
linux-firmware 1.187.20
Tags: focal
Uname: Linux 5.14.0-1015-oem x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 12/22/2021
dmi.bios.release: 0.14
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 0.14.88
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr0.14.88:bd12/22/2021:br0.14:svnDellInc.:pnOptiPlex7000:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct3:cvr:sku0AC1:
dmi.product.family: OptiPlex
dmi.product.name: OptiPlex 7000
dmi.product.sku: 0AC1
dmi.sys.vendor: Dell Inc.
apport information