Public bug reported:
I am on a Dell Latitude 5450 with Synaptics I²C HID touchpad (VEN_06CB)
BIOS version: 1.18.1
Running Ubuntu 24.04 with HWE kernel series
#regression summary
On kernel 6.14.0-35-generic: suspend/resume works, touchpad works
normally
On kernel 6.14.0-36-generic:
intermittently after resume, touchpad disappears from input subsystem
sometimes partially reappears but without any event handlers
requires full power cycle or EC reset to recover
This is a regression introduced between 6.14.0-35 and 6.14.0-36.
#symptoms
On kernel 6.14.0-36:
Touchpad completely disappears from /proc/bus/input/devices
ACPI enumerates device i2c-VEN_06CB:00 but no driver binds automatically
Manual unbind/bind causes a sysfs node to reappear but without
Handlers=eventX
runtime_status stays unsupported and no IRQ events fire
Touchpad does not generate any input events via libinput debug-events
Only a cold boot restores operation
#Steps to reproduce
-Boot kernel 6.14.0-36
-Log in normally
-Close lid or run systemctl suspend
-wait multiple hours (was not tested on short suspends)
-Resume
- Observe touchpad no longer functions, not listed in input devices
# Expected behavior
Touchpad resumes normally as it does on kernel 6.14.0-35.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.14.0-35-generic 6.14.0-35.35~24.04.1
ProcVersionSignature: Ubuntu 6.14.0-35.35~24.04.1-generic 6.14.11
Uname: Linux 6.14.0-35-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: francesco.marafatto 4472 F.... wireplumber
/dev/snd/seq: francesco.marafatto 4467 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Dec 9 14:13:08 2025
InstallationDate: Installed on 2024-12-09 (365 days ago)
InstallationMedia: Ubuntu-Server 22.04.4 LTS "Jammy Jellyfish" - Release amd64
(20240216.1)
MachineType: Dell Inc. Latitude 5450
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.14.0-35-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro
RelatedPackageVersions:
linux-restricted-modules-6.14.0-35-generic N/A
linux-backports-modules-6.14.0-35-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.21
SourcePackage: linux-hwe-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/04/2025
dmi.bios.release: 1.18
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.18.1
dmi.board.name: 09PJ34
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.ec.firmware.release: 1.18
dmi.modalias:
dmi:bvnDellInc.:bvr1.18.1:bd09/04/2025:br1.18:efr1.18:svnDellInc.:pnLatitude5450:pvr:rvnDellInc.:rn09PJ34:rvrA00:cvnDellInc.:ct10:cvr:sku0CB2:
dmi.product.family: Latitude
dmi.product.name: Latitude 5450
dmi.product.sku: 0CB2
dmi.sys.vendor: Dell Inc.
** Affects: linux-hwe-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2134474
Title:
Touchpad does not work after suspend on Dell Latitude 5450 with kernel
6.14.0-36
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