Public bug reported:
HDMI output not detected on ThinkPad X1 Carbon 6th gen with kernel
6.17.0-19-generic
Works on 6.17.0-14-generic, broken on 6.17.0-19-generic
xrandr shows HDMI-1 and HDMI-2 as disconnected
sudo i2cdetect -y 2 shows empty i2c bus (no monitor detected)
Hardware: ThinkPad X1 Carbon 6th gen, Intel UHD Graphics 620, i915 driver
Regression introduced by kernel update on March 14, 2026
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.17.0-14-generic 6.17.0-14.14~24.04.1
ProcVersionSignature: Ubuntu 6.17.0-14.14~24.04.1-generic 6.17.9
Uname: Linux 6.17.0-14-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: brando 3971 F.... wireplumber
/dev/snd/seq: brando 3967 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: GNOME-Classic:GNOME
Date: Wed Mar 18 19:37:53 2026
InstallationDate: Installed on 2026-02-21 (26 days ago)
InstallationMedia: Ubuntu 24.04.4 LTS "Noble Numbat" - Release amd64 (20260210)
MachineType: LENOVO 20KH002SUS
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.17.0-14-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.17.0-14-generic N/A
linux-backports-modules-6.17.0-14-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.25
SourcePackage: linux-hwe-6.17
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/07/2024
dmi.bios.release: 1.65
dmi.bios.vendor: LENOVO
dmi.bios.version: N23ET90W (1.65 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20KH002SUS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.22
dmi.modalias:
dmi:bvnLENOVO:bvrN23ET90W(1.65):bd11/07/2024:br1.65:efr1.22:svnLENOVO:pn20KH002SUS:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KH002SUS:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20KH_BU_Think_FM_ThinkPadX1Carbon6th:
dmi.product.family: ThinkPad X1 Carbon 6th
dmi.product.name: 20KH002SUS
dmi.product.sku: LENOVO_MT_20KH_BU_Think_FM_ThinkPad X1 Carbon 6th
dmi.product.version: ThinkPad X1 Carbon 6th
dmi.sys.vendor: LENOVO
** Affects: linux-hwe-6.17 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2144844
Title:
HDMI output not detected on ThinkPad X1 Carbon 6th gen with kernel
6.17.0-19-generic
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