Can't adjust screen backlight on Legion Slim 7 / Legion 5 (2021) AMD
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Arch Linux) |
New
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
The screen brightness controls don't work on the Legion Slim 7 (AMD) laptop running in hybrid/dynamic mode.
The backlight control files appear in /sys/class/
I have tried kernel boot parameters:
acpi_backlight=
amdgpu.backlight=0
but neither makes any difference.
I have read that users with the Legion 7 AMD and Legion 5 Pro AMD can get the backlight working with the amdgpu.backlight=0 kernel boot parameter. One difference between them and this laptop is that it has advanced optimus, meaning that it can switch the laptop display between the amdgpu and nvidia card without rebooting, if that is at all relevant.
ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-
ProcVersionSign
Uname: Linux 5.13.0-16-generic x86_64
NonfreeKernelMo
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/
CasperMD5CheckR
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 20 09:20:33 2021
InstallationDate: Installed on 2021-09-15 (5 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Alpha amd64 (20210910)
MachineType: LENOVO 82K8
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=
PulseList:
Error: command ['pacmd', 'list'] failed with exit code 1: XDG_RUNTIME_DIR (/run/user/1001) is not owned by us (uid 0), but by uid 1001! (This could e.g. happen if you try to connect to a non-root PulseAudio as a root user, over the native protocol. Don't do that.)
No PulseAudio daemon running, or not running as session daemon.
RelatedPackageV
linux-
linux-
linux-firmware 1.200
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/02/2021
dmi.bios.release: 1.27
dmi.bios.vendor: LENOVO
dmi.bios.version: HACN27WW
dmi.board.
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697WIN
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.ec.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.family: Legion S7 15ACH6
dmi.product.name: 82K8
dmi.product.sku: LENOVO_
dmi.product.
dmi.sys.vendor: LENOVO
tags: |
added: lunar removed: impish |
This change was made by a bot.