[Bug 2163509] [NEW] Lenovo Legion 5 Pro (83LT) – AMDGPU DMCUB error and NVIDIA SBIOS power-management errors on Ubuntu 26.04

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 -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb 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 Status in linux package in Ubuntu: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2163509/+subscriptions