Hi ChumAnWu The problem appeared when waking the PC from sleep mode. Here's the log after a reboot with the option added to the group.
The screen was working after the reboot. Best Le jeu. 18 juin 2026 à 09:45, ChunAnWu <[email protected]> a écrit : > Hi Geoffroy > Could you help me to add this "drm.debug=0x196" to your grub, > update-grub, reboot device and collect log again. Thanks > > BR > An > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/2155828 > > Title: > external display not detected with docking thunderbolt 4 > > Status in linux-oem-6.17 package in Ubuntu: > New > > Bug description: > lenovo p14S gen 5 + thinkpad docking station thunderbolt 4 external > display not detected > > ProblemType: Bug > DistroRelease: Ubuntu 24.04 > Package: linux-image-6.17.0-1025-oem 6.17.0-1025.25 > ProcVersionSignature: Ubuntu 6.17.0-1025.25-oem 6.17.13 > Uname: Linux 6.17.0-1025-oem x86_64 > ApportVersion: 2.28.1-0ubuntu3.8 > Architecture: amd64 > CasperMD5CheckResult: pass > CurrentDesktop: ubuntu:GNOME > Date: Mon Jun 8 09:37:19 2026 > InstallationDate: Installed on 2025-04-18 (416 days ago) > InstallationMedia: Ubuntu 24.04.1 2025.01.17 LTS "Custom Noble Numbat" > (20250130) > MachineType: LENOVO 21ME0005FR > ProcFB: 0 amdgpudrmfb > ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.17.0-1025-oem > root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash vt.handoff=7 > RelatedPackageVersions: > linux-restricted-modules-6.17.0-1025-oem N/A > linux-backports-modules-6.17.0-1025-oem N/A > linux-firmware > 20240318.git3b128b60-0ubuntu2.27 > SourcePackage: linux-oem-6.17 > UpgradeStatus: No upgrade log present (probably fresh install) > dmi.bios.date: 03/25/2026 > dmi.bios.release: 1.21 > dmi.bios.vendor: LENOVO > dmi.bios.version: R2LET40W (1.21 ) > dmi.board.asset.tag: Not Available > dmi.board.name: 21ME0005FR > dmi.board.vendor: LENOVO > dmi.board.version: SDK0T76530 WIN > dmi.chassis.asset.tag: No Asset Tag > dmi.chassis.type: 10 > dmi.chassis.vendor: LENOVO > dmi.chassis.version: None > dmi.ec.firmware.release: 1.13 > dmi.modalias: > dmi:bvnLENOVO:bvrR2LET40W(1.21):bd03/25/2026:br1.21:efr1.13:svnLENOVO:pn21ME0005FR:pvrThinkPadP14sGen5AMD:rvnLENOVO:rn21ME0005FR:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21ME_BU_Think_FM_ThinkPadP14sGen5AMD: > dmi.product.family: ThinkPad P14s Gen 5 AMD > dmi.product.name: 21ME0005FR > dmi.product.sku: LENOVO_MT_21ME_BU_Think_FM_ThinkPad P14s Gen 5 AMD > dmi.product.version: ThinkPad P14s Gen 5 AMD > dmi.sys.vendor: LENOVO > > To manage notifications about this bug go to: > > https://bugs.launchpad.net/ubuntu/+source/linux-oem-6.17/+bug/2155828/+subscriptions > > -- Geoffroy de Guillebon 06 77 55 40 70 ** Attachment added: "display.txt" https://bugs.launchpad.net/bugs/2155828/+attachment/5977978/+files/display.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2155828 Title: external display not detected with docking thunderbolt 4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-oem-6.17/+bug/2155828/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
