Public bug reported:
**Kernel regression: internal display becomes abnormally dim with
7.0.0-28**
On my Dell Latitude 7390 running Ubuntu Cinnamon 26.04, the internal
laptop display becomes abnormally dim when booted with Linux kernel
7.0.0-28-generic.
The problem started immediately after upgrading from kernel 7.0.0-27 to
7.0.0-28.
I tested both kernels on the same computer:
* 7.0.0-28-generic: internal display is abnormally dim.
* 7.0.0-27-generic: display brightness is normal.
Booting 7.0.0-27 immediately restores normal display brightness.
There is no external monitor connected. The problem affects only the
built-in laptop display.
This appears to be a kernel regression introduced in 7.0.0-28. Please
investigate possible changes to the Intel i915 DRM/display/backlight
subsystem.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-27-generic 7.0.0-27.27
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: user-meir 3893 F.... pipewire
user-meir 3897 F.... wireplumber
/dev/snd/pcmC0D0p: user-meir 3893 F...m pipewire
/dev/snd/seq: user-meir 3893 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: X-Cinnamon
Date: Mon Jul 27 15:07:58 2026
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 0bda:58ca Realtek Semiconductor Corp.
Integrated_Webcam_HD
Bus 001 Device 003: ID 8087:0032 Intel Corp. AX210 Bluetooth
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: Dell Inc. Latitude 7390
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-7.0.0-27-generic
root=UUID=f1f51d68-fa8a-4c38-b218-a14509b07bc9 ro quiet splash
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:
dmi.bios.date: 11/06/2024
dmi.bios.release: 1.41
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.41.0
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.41.0:bd11/06/2024:br1.41:svnDellInc.:pnLatitude7390:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:sku081B:pfaLatitude:
dmi.product.family: Latitude
dmi.product.name: Latitude 7390
dmi.product.sku: 081B
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2161928
Title:
ernel regression: inteKernal display becomes abnormally dim with
7.0.0-28
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