[Bug 1899626] [NEW] Backlight does not work on the legion 5 15arh

Public bug reported:

Backlight keys/backlight control does not work. cat
/sys/class/backlight/amdgpu_bl0/actual_brightness outputs

311

which is above the max brightness.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: linux-image-5.8.0-22-generic 5.8.0-22.23
ProcVersionSignature: Ubuntu 5.8.0-22.23-generic 5.8.14
Uname: Linux 5.8.0-22-generic x86_64
ApportVersion: 2.20.11-0ubuntu49
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: tanapoom 1505 F.... pulseaudio
/dev/snd/controlC0: tanapoom 1505 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 13 21:20:31 2020
InstallationDate: Installed on 2020-10-13 (0 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Beta amd64 (20200930)
MachineType: LENOVO 82B5
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-22-generic root=UUID=a967ce85-0dda-4707-871b-69cbcbcf0b4e ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.8.0-22-generic N/A
linux-backports-modules-5.8.0-22-generic N/A
linux-firmware 1.190
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/19/2020
dmi.bios.release: 1.26
dmi.bios.vendor: LENOVO
dmi.bios.version: EUCN26WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: NO DPK
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Legion 5 15ARH05
dmi.ec.firmware.release: 1.26
dmi.modalias: dmi:bvnLENOVO:bvrEUCN26WW:bd08/19/2020:br1.26:efr1.26:svnLENOVO:pn82B5:pvrLenovoLegion515ARH05:rvnLENOVO:rnLNVNB161216:rvrNODPK:cvnLENOVO:ct10:cvrLenovoLegion515ARH05:
dmi.product.family: Legion 5 15ARH05
dmi.product.name: 82B5
dmi.product.sku: LENOVO_MT_82B5_BU_idea_FM_Legion 5 15ARH05
dmi.product.version: Lenovo Legion 5 15ARH05
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed


** Tags: amd64 apport-bug groovy

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https://bugs.launchpad.net/bugs/1899626

Title:
Backlight does not work on the legion 5 15arh

Status in linux package in Ubuntu:
Confirmed

Bug description:
Backlight keys/backlight control does not work. cat
/sys/class/backlight/amdgpu_bl0/actual_brightness outputs

311

which is above the max brightness.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: linux-image-5.8.0-22-generic 5.8.0-22.23
ProcVersionSignature: Ubuntu 5.8.0-22.23-generic 5.8.14
Uname: Linux 5.8.0-22-generic x86_64
ApportVersion: 2.20.11-0ubuntu49
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: tanapoom 1505 F.... pulseaudio
/dev/snd/controlC0: tanapoom 1505 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 13 21:20:31 2020
InstallationDate: Installed on 2020-10-13 (0 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Beta amd64 (20200930)
MachineType: LENOVO 82B5
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-22-generic root=UUID=a967ce85-0dda-4707-871b-69cbcbcf0b4e ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.8.0-22-generic N/A
linux-backports-modules-5.8.0-22-generic N/A
linux-firmware 1.190
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/19/2020
dmi.bios.release: 1.26
dmi.bios.vendor: LENOVO
dmi.bios.version: EUCN26WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: NO DPK
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Legion 5 15ARH05
dmi.ec.firmware.release: 1.26
dmi.modalias: dmi:bvnLENOVO:bvrEUCN26WW:bd08/19/2020:br1.26:efr1.26:svnLENOVO:pn82B5:pvrLenovoLegion515ARH05:rvnLENOVO:rnLNVNB161216:rvrNODPK:cvnLENOVO:ct10:cvrLenovoLegion515ARH05:
dmi.product.family: Legion 5 15ARH05
dmi.product.name: 82B5
dmi.product.sku: LENOVO_MT_82B5_BU_idea_FM_Legion 5 15ARH05
dmi.product.version: Lenovo Legion 5 15ARH05
dmi.sys.vendor: LENOVO

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