Public bug reported:
I am using a Lenovo Legion 5 Pro (83LT) with a Ryzen 7 8745HX,
integrated AMD Radeon 610M, and NVIDIA GeForce RTX 5060 Laptop GPU.
On a fresh Ubuntu 26.04 installation, the system consistently reports an
AMDGPU DMCUB error during boot:
amdgpu 0000:05:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data:
DMCUB error - collecting diagnostic data
The AMDGPU firmware itself loads successfully:
Loading DMUB firmware via PSP: version=0x05002E00
DMUB hardware initialized: version=0x05002E00
Using ACPI provided EDID for eDP-2
The system also reports NVIDIA SBIOS/platform power-management errors:
NVRM: GPU0 nvAssertOkFailedNoLog: Assertion failed:
Invalid data passed [NV_ERR_INVALID_DATA]
PlatformRequestHandler failed to get target temp from SBIOS
PlatformRequestHandler failed to get platform power mode from SBIOS
There is also an ACPI BIOS error:
ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.PB2],
AE_NOT_FOUND
and:
ACPI Error: AE_NOT_FOUND, During name lookup/catalog
The system is running:
Ubuntu 26.04 (Resolute)
Kernel: 7.0.0-29-generic
GNOME Shell: 50.1
Wayland
NVIDIA driver: 595.84
Mesa: 26.0.3
Both GPUs are detected correctly:
NVIDIA GeForce RTX 5060 Laptop GPU
Kernel driver: nvidia
AMD Radeon 610M
Kernel driver: amdgpu
nvidia-smi works correctly and the NVIDIA GPU is available to GNOME
Shell.
The system is generally functional, but GNOME applications such as GNOME
Control Center experience noticeable startup delays. gnome-control-
center initially took approximately 7 seconds to start. After
troubleshooting Bluetooth/OBEX, this decreased to approximately 2.6
seconds, but the underlying graphics/firmware errors remain.
A full system health check showed:
NVMe SMART: PASSED
No failed systemd services
RAM and storage resources are healthy
NVIDIA GPU detected and operational
AMDGPU loaded correctly
Bluetooth controller operational
NetworkManager operational
I would like to determine whether the DMCUB error, ACPI BIOS error, and
NVIDIA SBIOS power-management errors are caused by Lenovo firmware/BIOS
compatibility with the current Ubuntu kernel and drivers, and whether a
BIOS/firmware or kernel/driver fix is required.
I can provide the complete system diagnostic report if required.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: pranav 4706 F.... wireplumber
/dev/snd/controlC0: pranav 4706 F.... wireplumber
/dev/snd/seq: pranav 4688 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 14 21:08:25 2026
InstallationDate: Installed on 2026-07-27 (18 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 83LT
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-29-generic
root=UUID=a028c422-b500-4883-999f-959a535d3659 ro quiet splash
nvidia.NVreg_DynamicPowerManagement=0x00 nvidia.NVreg_EnableGpuFirmware=0
acpi_osi=Linux pcie_aspm=off
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/25/2025
dmi.bios.release: 1.32
dmi.bios.vendor: LENOVO
dmi.bios.version: RLCN32WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76485 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Legion Pro 5 16ADR10
dmi.ec.firmware.release: 1.31
dmi.modalias:
dmi:bvnLENOVO:bvrRLCN32WW:bd11/25/2025:br1.32:efr1.31:svnLENOVO:pn83LT:pvrLegionPro516ADR10:rvnLENOVO:rnLNVNB161216:rvrSDK0T76485WIN:cvnLENOVO:ct10:cvrLegionPro516ADR10:skuLENOVO_MT_83LT_BU_idea_FM_LegionPro516ADR10:pfaLegionPro516ADR10:
dmi.product.family: Legion Pro 5 16ADR10
dmi.product.name: 83LT
dmi.product.sku: LENOVO_MT_83LT_BU_idea_FM_Legion Pro 5 16ADR10
dmi.product.version: Legion Pro 5 16ADR10
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2163509
Title:
Lenovo Legion 5 Pro (83LT) – AMDGPU DMCUB error and NVIDIA SBIOS
power-management errors on Ubuntu 26.04
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