Public bug reported:
Laptop has OLED panel (EDO 3015 - EF25QBA63.B). Screen is at full
brightness no matter how much I play with the slider.
Tried the common internet tricks and scripts, nothing.
Tried multiple flavours of Debian-based, Fedora-based and Arch based distros,
problem persists.
Tried kernel 7.0.0-22-generic, still nothing
out of desperation I installed latest stable mainline kernel from
kernel.ubuntu.com - v7.1.5-generic, problem still persists
if VBT is required, please guide me to definitive steps as I tried one
way I saw and it gives me an (input/output error)
Ubuntu Release:
26.04 LTS
Linux Release:
7.0.0-29-generic
What is expected to happen:
Moving screen brightness slider should modify the brightness of the OLED panel
What happened instead:
no response, screen at full brightness.
demsg output does not print any responses as I play around with the slider.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: omar 4317 F.... wireplumber
/dev/snd/seq: omar 4311 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Aug 11 15:15:58 2026
InstallationDate: Installed on 2026-08-11 (0 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 83SN
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
XDG_RUNTIME_DIR=<set>
ProcFB: 0 xedrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-29-generic
root=UUID=02db4a59-6dd6-40bd-af90-92192c3afc49 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: 05/14/2026
dmi.bios.release: 1.37
dmi.bios.vendor: LENOVO
dmi.bios.version: TNCN37WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76576 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Yoga Pro 7 15IPH11
dmi.ec.firmware.release: 1.37
dmi.modalias:
dmi:bvnLENOVO:bvrTNCN37WW:bd05/14/2026:br1.37:efr1.37:svnLENOVO:pn83SN:pvrYogaPro715IPH11:rvnLENOVO:rnLNVNB161216:rvrSDK0T76576WIN:cvnLENOVO:ct10:cvrYogaPro715IPH11:skuLENOVO_MT_83SN_BU_idea_FM_YogaPro715IPH11:pfaYogaPro715IPH11:
dmi.product.family: Yoga Pro 7 15IPH11
dmi.product.name: 83SN
dmi.product.sku: LENOVO_MT_83SN_BU_idea_FM_Yoga Pro 7 15IPH11
dmi.product.version: Yoga Pro 7 15IPH11
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2163244
Title:
Ubuntu 26.04 LTS -- Lenovo Yoga 7 Pro 15IPH11 Screen Brightness not
Working
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