amdgpu freezes display on usb-c dock

[Rob J]

Hi,

I think this is related to 1980831 but I'm not sure.

Since updating a bunch of packages on Thursday, whenever my ThinkPad E495 is plugged into its USB-C dock attached to 2 DisplayPort monitors, the GUI completely freezes. Changing to a TTY is not possible. SSH still works. This occurs whether the laptop is running at the desktop and docked, or booted from cold while docked. It is fully functional while undocked.

Hardware: ThinkPad E495 (Ryzen 5 3500U, Radeon Vega 8), Lenovo USB-C Dock Gen. 2, 2x Acer Nitro VG270Ubmiipx DisplayPort LCDs (2560x1440@60Hz)
Ubuntu release: 22.04.3
Kernel: 6.2.0-26-generic

Expected: docking the laptop results in detection and use of the external monitors, as per previous 12+ months

Actual: display goes black with cursor on laptop LCD, cursor frozen. One external activates, displaying black. Other external has no signal.

Tried: rebooting, changed from kernel 5.19.0 to 6.2.0, xrandr via SSH (hangs), undocking (no change)

Packages that were updated 20 minutes prior to first crash: libgpgmepp6:amd64 (1.16.0-1.2ubuntu4, 1.16.0-1.2ubuntu4.1), libgl1-amber-dri:amd64 (21.3.7-0ubuntu1, 21.3.9-0ubuntu1~22.04.1), libglx-mesa0:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), python3-distupgrade:amd64 (1:22.04.16, 1:22.04.17), language-pack-en-base:amd64 (1:22.04+20230209, 1:22.04+20230801), libgtk-4-common:amd64 (4.6.6+ds-0ubuntu1, 4.6.9+ds-0ubuntu0.22.04.1), libunwind8:amd64 (1.3.2-2build2, 1.3.2-2build2.1), ufw:amd64 (0.36.1-4build1, 0.36.1-4ubuntu0.1), libgbm1:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), ubuntu-release-upgrader-gtk:amd64 (1:22.04.16, 1:22.04.17), slack-desktop:amd64 (4.33.73, 4.33.84), libmutter-10-0:amd64 (42.9-0ubuntu1, 42.9-0ubuntu4), language-pack-en:amd64 (1:22.04+20230209, 1:22.04+20230801), language-pack-gnome-en-base:amd64 (1:22.04+20230209, 1:22.04+20230801), libxatracker2:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), gir1.2-gtk-4.0:amd64 (4.6.6+ds-0ubuntu1, 4.6.9+ds-0ubuntu0.22.04.1), mutter-common:amd64 (42.9-0ubuntu1, 42.9-0ubuntu4), libegl1-mesa:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), python-apt-common:amd64 (2.4.0ubuntu1, 2.4.0ubuntu2), libgpgme11:amd64 (1.16.0-1.2ubuntu4, 1.16.0-1.2ubuntu4.1), mesa-va-drivers:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), libgl1-mesa-dri:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), libgl1-mesa-glx:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), firefox:amd64 (116.0+build2-0ubuntu0.22.04.1~mt1, 116.0.2+build1-0ubuntu0.22.04.1~mt1), gir1.2-mutter-10:amd64 (42.9-0ubuntu1, 42.9-0ubuntu4), mesa-vulkan-drivers:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), base-files:amd64 (12ubuntu4.3, 12ubuntu4.4), python3-apt:amd64 (2.4.0ubuntu1, 2.4.0ubuntu2), python3-distro-info:amd64 (1.1build1, 1.1ubuntu0.1), linux-firmware:amd64 (20220329.git681281e4-0ubuntu3.16, 20220329.git681281e4-0ubuntu3.17), distro-info:amd64 (1.1build1, 1.1ubuntu0.1), libglapi-mesa:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), libgtk-4-1:amd64 (4.6.6+ds-0ubuntu1, 4.6.9+ds-0ubuntu0.22.04.1), language-pack-gnome-en:amd64 (1:22.04+20230209, 1:22.04+20230801), libegl-mesa0:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1), libgtk-4-bin:amd64 (4.6.6+ds-0ubuntu1, 4.6.9+ds-0ubuntu0.22.04.1), ubuntu-release-upgrader-core:amd64 (1:22.04.16, 1:22.04.17), mesa-vdpau-drivers:amd64 (22.2.5-0ubuntu0.1~22.04.3, 23.0.4-0ubuntu1~22.04.1)

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-6.2.0-26-generic 6.2.0-26.26~22.04.1
ProcVersionSignature: Ubuntu 6.2.0-26.26~22.04.1-generic 6.2.13
Uname: Linux 6.2.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
Date: Sun Aug 13 20:22:47 2023
InstallationDate: Installed on 2022-08-30 (348 days ago)
InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed-hwe-6.2
UpgradeStatus: No upgrade log present (probably fresh install)

[Rob J (quantumparticleresearch)]

These syslog snippets should be useful