[Bug 2161495] Re: Dell Lattitude 7400 + 7.0.0-28-generic

Thanks for reporting the bug and providing the logs! This issue looks to be much alike https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161309, would you mind looking at comment #4 and #10 and possibly doing a few more checks? ** Changed in: linux (Ubuntu) Importance: Undecided => High ** Changed in: linux (Ubuntu) Status: New => Confirmed ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Krystian Kaniewski (kkaniewski) -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2161495 Title: Dell Lattitude 7400 + 7.0.0-28-generic Status in linux package in Ubuntu: Confirmed Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161495/+subscriptions