Public bug reported:
Lenovo ThinkPad P16v Gen 2 (21N5)
Ubuntu 26.04.1 LTS
ThinkPad Thunderbolt 4 Dock firmware 10.20
Regression between:
Working:
7.0.0-34-generic
Broken:
7.0.0-38-generic
Symptoms:
- Dock is detected by boltctl
- Dock is authorized
- Keyboard/mouse/audio/network through dock work
- External monitors are not detected at all
Working kernel:
ls /sys/class/drm shows:
card2-DP-1
card2-DP-2
card2-DP-3
card2-DP-4
Broken kernel:
ls /sys/class/drm shows only:
card1
card1-eDP-1
renderD128
xrandr on 7.0.0-34:
DP-3 connected
DP-4 connected
xrandr on 7.0.0-38:
Only eDP-1 present
Tested multiple times by rebooting between kernels.
Issue reproduces consistently.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-38-generic 7.0.0-38.38
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 14 14:26:43 2026
InstallationDate: Installed on 2026-06-29 (107 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 21N5
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-kitty
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-38-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash
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: 09/03/2024
dmi.bios.release: 1.26
dmi.bios.vendor: LENOVO
dmi.bios.version: P5CN26WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
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: ThinkBook 16p G5 IRX
dmi.ec.firmware.release: 1.22
dmi.modalias:
dmi:bvnLENOVO:bvrP5CN26WW:bd09/03/2024:br1.26:efr1.22:svnLENOVO:pn21N5:pvrThinkBook16pG5IRX:rvnLENOVO:rnLNVNB161216:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrThinkBook16pG5IRX:skuLENOVO_MT_21N5_BU_idea_FM_ThinkBook16pG5IRX:pfaThinkBook16pG5IRX:
dmi.product.family: ThinkBook 16p G5 IRX
dmi.product.name: 21N5
dmi.product.sku: LENOVO_MT_21N5_BU_idea_FM_ThinkBook 16p G5 IRX
dmi.product.version: ThinkBook 16p G5 IRX
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "Output of dmesg and boltctl on both kernel versions"
https://bugs.launchpad.net/bugs/2170822/+attachment/6009044/+files/bug-report.txt
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https://bugs.launchpad.net/bugs/2170822
Title:
7.0.0-38: Lenovo dock external monitors regression
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