Public bug reported:
After upgrading linux-firmware-amd-graphics from 20240318.git3b128b60-0ubuntu3.3
to 20240318.git3b128b60-0ubuntu3.4, my system shows short stutters, freezes for
1-2 minutes when turning on the second monitor, and boots very slowly with the
second monitor on.
The kernel log is flooded with:
amdgpu 0000:03:00.0: [drm] *ERROR* Error queueing DMUB command: status=2
amdgpu 0000:03:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB
error - collecting diagnostic data
Hardware: AMD Radeon RX 9070, dual monitor setup, GNOME Wayland.
Booting the older kernel 7.0.0-38 did not help (same firmware is loaded).
Downgrading linux-firmware-amd-graphics to 0ubuntu3.3 (and regenerating the
initramfs) fixes the problem completely. No DMCUB errors anymore.
So this is a regression introduced in 0ubuntu3.4.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-firmware-amd-graphics 20240318.git3b128b60-0ubuntu3.3
ProcVersionSignature: Ubuntu 7.0.0-42.42~24.04.1-generic 7.0.14
Uname: Linux 7.0.0-42-generic x86_64
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 6 18:48:05 2026
Dependencies:
InstallationDate: Installed on 2026-01-06 (304 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
PackageArchitecture: all
ProcEnviron:
LANG=de_DE.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: linux-firmware-amd-graphics
UpgradeStatus: Upgraded to noble on 2026-10-20 (17 days ago)
** Affects: linux-firmware-amd-graphics (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2173568
Title:
RX 9070 (RDNA4): DMCUB errors and display freezes after upgrade to
0ubuntu3.4
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