Public bug reported:
Laptop: Dell Latitude 5320
GPU: Intel Iris Xe (Tiger Lake)
Ubuntu: 24.04.4 LTS
Kernel 6.17.0-40: Brightness works normally.
Kernel 7.0.0-28: Screen becomes extremely dim immediately after Ubuntu starts
loading.
Dell logo during boot is bright.
GNOME brightness slider shows 100%.
/sys/class/backlight/intel_backlight/brightness reports 1023, but the display
remains very dim.
Rebooting into 6.17.0-40 restores normal brightness.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.17.0-40-generic 6.17.0-40.40~24.04.1
ProcVersionSignature: Ubuntu 6.17.0-40.40~24.04.1-generic 6.17.13
Uname: Linux 6.17.0-40-generic x86_64
ApportVersion: 2.28.2-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: omar-akhter 2716 F.... wireplumber
/dev/snd/seq: omar-akhter 2713 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 30 22:31:22 2026
InstallationDate: Installed on 2026-02-14 (166 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
MachineType: Dell Inc. Latitude 5320
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=/boot/vmlinuz-6.17.0-40-generic
root=UUID=26beb24d-fc67-4c82-985a-492608f22b50 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.17.0-40-generic N/A
linux-backports-modules-6.17.0-40-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.27
SourcePackage: linux-hwe-6.17
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/27/2026
dmi.bios.release: 1.51
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.51.0
dmi.board.name: 0KRH0R
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.51.0:bd04/27/2026:br1.51:svnDellInc.:pnLatitude5320:pvr:rvnDellInc.:rn0KRH0R:rvrA00:cvnDellInc.:ct10:cvr:sku0A1F:
dmi.product.family: Latitude
dmi.product.name: Latitude 5320
dmi.product.sku: 0A1F
dmi.sys.vendor: Dell Inc.
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2162368
Title:
Backlight regression on Dell Latitude 5320 with Intel Iris Xe after
upgrading to kernel 7.0.0-28
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