Hi ChunAnWu, I tried both cases, it's very painful to have the external screens working. The screens are connected with Display Port in daisy-chain via the docking station. Sometimes it working after plug one screen to hdmi on the laptop, then replug the screen via DP on the docking station
Best Regards Geoffroy linux laptop Ubuntu 24.04 + docking station thunderbolt 4 thinkpad sudo dmesg | grep -iE "drm|dp|displayport|edid" | tail -30 [sudo] password for xxx: [ 95.070288] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD RX IRQ callback: link_index=6 [ 95.072986] amdgpu 0000:c4:00.0: [drm] *ERROR* failed to lookup MSTB with lct 2, rad 00 [ 95.075291] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD RX IRQ callback: link_index=6 [ 95.076542] amdgpu 0000:c4:00.0: [drm] *ERROR* failed to lookup MSTB with lct 2, rad 00 [ 95.132597] amdgpu 0000:c4:00.0: [drm] *ERROR* Sending link address failed with -5 [ 126.365539] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD IRQ callback: link_index=6 [ 126.365591] [drm] DM_MST: stopping TM on aconnector: 0000000020ced1c3 [id: 134] [ 162.621034] usb 7-1: New USB device found, idVendor=17ef, idProduct=30ba, bcdDevice= 1.01 [ 163.360453] usb 7-1.1: New USB device found, idVendor=17ef, idProduct=30b4, bcdDevice= 1.00 [ 163.666451] usb 7-1.2: New USB device found, idVendor=17ef, idProduct=30b5, bcdDevice=10.19 [ 163.984645] usb 8-1: New USB device found, idVendor=8087, idProduct=0b40, bcdDevice=12.34 [ 164.148635] usb 7-1.4: New USB device found, idVendor=17ef, idProduct=30b7, bcdDevice=55.64 [ 164.564250] usb 8-1.4: New USB device found, idVendor=17ef, idProduct=30b6, bcdDevice=55.64 [ 164.748489] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD IRQ callback: link_index=6 [ 164.801100] [drm] DM_MST: starting TM on aconnector: 0000000020ced1c3 [id: 134] [ 164.803820] [drm] DM_MST: DP14, 4-lane link detected [ 164.867974] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD RX IRQ callback: link_index=6 [ 164.872628] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD RX IRQ callback: link_index=6 [ 164.876947] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD RX IRQ callback: link_index=6 [ 164.882751] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD RX IRQ callback: link_index=6 [ 165.117495] usb 7-1.4.2: New USB device found, idVendor=046d, idProduct=c328, bcdDevice=86.00 [ 165.294103] usb 8-1.4.4: New USB device found, idVendor=17ef, idProduct=30b8, bcdDevice=55.63 [ 165.606873] usb 7-1.4.4: New USB device found, idVendor=17ef, idProduct=30b9, bcdDevice=55.63 [ 167.092092] usb 8-1.4.4.3: New USB device found, idVendor=0bda, idProduct=8153, bcdDevice=31.21 [ 167.393765] usb 7-1.4.4.4: New USB device found, idVendor=17ef, idProduct=30bb, bcdDevice= 0.41 [ 168.822138] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD RX IRQ callback: link_index=6 [ 168.823804] amdgpu 0000:c4:00.0: [drm] *ERROR* failed to lookup MSTB with lct 2, rad 00 [ 168.825952] amdgpu 0000:c4:00.0: amdgpu: [drm] DMUB HPD RX IRQ callback: link_index=6 [ 168.826311] amdgpu 0000:c4:00.0: [drm] *ERROR* failed to lookup MSTB with lct 2, rad 00 [ 168.929336] amdgpu 0000:c4:00.0: [drm] *ERROR* Sending link address failed with -5 Le mer. 10 juin 2026 à 04:50, ChunAnWu <[email protected]> a écrit : > Hi Geoffroy > May I know more details? Did you boot system with dock plugged or did > you hot-plug dock but no response ? > > 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 -- 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
