Public bug reported:
Since 20240318.git3b128b60-0ubuntu3.4 (noble-updates),
/lib/firmware/amdgpu/dcn_4_0_1_dmcub.bin.zst is a symlink to
dcn_3_2_0_dmcub.bin.zst. DCN 4.0.1 (Navi 48 / RX 9070 XT) is handed DCN 3.2
DMCUB firmware and PSP rejects it:
amdgpu: failed to load ucode DMCUB(0x3F)
psp gfx command LOAD_IP_FW(0x6) failed and response status is (0x11)
[drm] *ERROR* Error queueing DMUB command: status=2 (repeating)
Result: boot hangs at the splash screen on kernels 7.0.0-38 and
7.0.0-42.
Downgrading to 0ubuntu3.3 (real 225 KB dcn_4_0_1_dmcub.bin.zst, DMUB
version 0x0A000800) fully fixes it.
Hardware: Gigabyte RX 9070 XT (1002:7550, subsys 1458:2424), Ubuntu 24.04,
kernel 7.0.0-42-generic.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-firmware 20240318.git3b128b60.0ubuntu3.1
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 10:43:56 2026
InstallationDate: Installed on 2025-10-20 (383 days ago)
InstallationMedia: Ubuntu 22.04.5 LTS "Jammy Jellyfish" - Release amd64
(20240911)
MachineType: System manufacturer System Product Name
PackageArchitecture: all
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/usr/bin/zsh
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-42-generic
root=UUID=bfdc6d6a-4634-4799-a639-28e944831e39 ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-7.0.0-42-generic N/A
linux-backports-modules-7.0.0-42-generic N/A
linux-firmware 20240318.git3b128b60.0ubuntu3.1
SourcePackage: linux-firmware
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/13/2025
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 5602
dmi.board.asset.tag: Default string
dmi.board.name: ROG STRIX B450-F GAMING
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr5602:bd01/13/2025:br5.17:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXB450-FGAMING:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:pfaTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
** Affects: linux-firmware (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2173569
Title:
linux-firmware-amd-graphics 0ubuntu3.4: dcn_4_0_1_dmcub symlinked to
dcn_3_2_0, RX 9070 XT display fails to init
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