Public bug reported:
acpi_osi=Linux and acpi_backlight=vendor do not fix. Depending on the
kernel parameters, /sys/class/backlight contains either "acpi_video0" or
"ideapad". I have also tried acpi_backlight=none
ls /sys/class/backlight:
acpi_video0
grep -r . /proc/acpi
/proc/acpi/button/lid/LID/state:state: open
/proc/acpi/wakeup:Device S-state Status Sysfs node
/proc/acpi/wakeup:GPP0 S3 *disabled
/proc/acpi/wakeup:GPP1 S3 *enabled pci:0000:00:01.2
/proc/acpi/wakeup:GPP2 S3 *enabled pci:0000:00:01.3
/proc/acpi/wakeup:GPP3 S3 *disabled
/proc/acpi/wakeup:GPP4 S3 *disabled
/proc/acpi/wakeup:GPP5 S3 *disabled
/proc/acpi/wakeup:GPP6 S3 *disabled
/proc/acpi/wakeup:GP17 S3 *enabled pci:0000:00:08.1
/proc/acpi/wakeup:XHC0 S3 *enabled pci:0000:03:00.3
/proc/acpi/wakeup:XHC1 S3 *enabled pci:0000:03:00.4
/proc/acpi/wakeup:GP18 S3 *enabled pci:0000:00:08.2
iasl -d dsdt.dat
Intel ACPI Component Architecture
ASL+ Optimizing Compiler/Disassembler version 20180105
Copyright (c) 2000 - 2018 Intel Corporation
Input file dsdt.dat, Length 0x6FA5 (28581) bytes
ACPI: DSDT 0x0000000000000000 006FA5 (v01 LENOVO AMD 00001000 INTL
20120711)
Pass 1 parse of [DSDT]
Pass 2 parse of [DSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)
Parsing completed
Found 6 external control methods, reparsing with new information
Pass 1 parse of [DSDT]
Pass 2 parse of [DSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)
Parsing completed
Disassembly completed
ASL Output: dsdt.dsl - 318645 bytes
iASL Warning: There were 6 external control methods found during
disassembly, but only 0 were resolved (6 unresolved). Additional
ACPI tables may be required to properly disassemble the code. This
resulting disassembler output file may not compile because the
disassembler did not know how many arguments to assign to the
unresolved methods. Note: SSDTs can be dynamically loaded at
runtime and may or may not be available via the host OS.
To specify the tables needed to resolve external control method
references, the -e option can be used to specify the filenames.
Example iASL invocations:
iasl -e ssdt1.aml ssdt2.aml ssdt3.aml -d dsdt.aml
iasl -e dsdt.aml ssdt2.aml -d ssdt1.aml
iasl -e ssdt*.aml -d dsdt.aml
In addition, the -fe option can be used to specify a file containing
control method external declarations with the associated method
argument counts. Each line of the file must be of the form:
External (<method pathname>, MethodObj, <argument count>)
Invocation:
iasl -fe refs.txt -d dsdt.aml
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-76-generic 4.15.0-76.86
ProcVersionSignature: Ubuntu 4.15.0-76.86-generic 4.15.18
Uname: Linux 4.15.0-76-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: eli 1603 F.... pulseaudio
/dev/snd/controlC0: eli 1603 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sat Feb 15 01:51:30 2020
InstallationDate: Installed on 2020-01-30 (15 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: LENOVO 81LY
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-76-generic
root=UUID=97a5f239-2442-42e1-a2c8-b7bf4985a13a ro quiet splash vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.15.0-76-generic N/A
linux-backports-modules-4.15.0-76-generic N/A
linux-firmware 1.173.14
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/28/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: ARCN33WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40700WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad L340-17API
dmi.modalias:
dmi:bvnLENOVO:bvrARCN33WW:bd10/28/2019:svnLENOVO:pn81LY:pvrLenovoIdeaPadL340-17API:rvnLENOVO:rnLNVNB161216:rvrSDK0J40700WIN:cvnLENOVO:ct10:cvrLenovoIdeaPadL340-17API:
dmi.product.family: IdeaPad L340-17API
dmi.product.name: 81LY
dmi.product.version: Lenovo IdeaPad L340-17API
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
** Attachment added: "proc-acpi"
https://bugs.launchpad.net/bugs/1863407/+attachment/5328330/+files/grep%20-r%20.%20proc-acpi
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https://bugs.launchpad.net/bugs/1863407
Title:
Lenovo Ideapad L340 screen backlight stuck at maximum brightness
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