Public bug reported:
Hello.
Running a Dell Latitude 7400. Internal display becomes dim when kernel
7.0.0-28-generic loads, despite backlight being at 100%. Kernel
7.0.0-14-generic works normally. Regression appeared after the first apt
upgrade.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-14-generic 7.0.0-14.14
ProcVersionSignature: Ubuntu 7.0.0-14.14-generic 7.0.0
Uname: Linux 7.0.0-14-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: cavalier 3993 F.... wireplumber
/dev/snd/seq: cavalier 3976 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul 22 15:52:29 2026
InstallationDate: Installed on 2026-07-22 (0 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: Dell Inc. Latitude 7400
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-7.0.0-14-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: 03/06/2025
dmi.bios.release: 1.39
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.39.0
dmi.board.name: 07WDVW
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.39.0:bd03/06/2025:br1.39:svnDellInc.:pnLatitude7400:pvr:rvnDellInc.:rn07WDVW:rvrA01:cvnDellInc.:ct10:cvr:sku08E1:pfaLatitude:
dmi.product.family: Latitude
dmi.product.name: Latitude 7400
dmi.product.sku: 08E1
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2161495
Title:
Dell Lattitude 7400 + 7.0.0-28-generic
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