Public bug reported:

Lenovo Legion with Nvidia card:

FN+F5/F6 shows brightness changes, but the screen actually doesn't
change at all.

01:00.0 VGA compatible controller: NVIDIA Corporation TU117M [GeForce
GTX 1650 Mobile / Max-Q] (rev a1)

nvidia              20430848  538 nvidia_uvm,nvidia_modeset
nvidia_drm             45056  8
nvidia_modeset       1114112  12 nvidia_drm
nvidia_uvm            966656  0
nvme                   49152  2
nvme_core             102400  4 nvme

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  440.64  Fri Feb 21 01:17:26 
UTC 2020
 GCC version:  gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 24 06:23:22 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus: nvidia, 440.64, 5.4.0-26-generic, x86_64: installed
ExtraDebuggingInterest: Yes
 NVIDIA Corporation TU117M [GeForce GTX 1650 Mobile / Max-Q] [10de:1f91] (rev 
a1) (prog-if 00 [VGA controller])
   Subsystem: Lenovo TU117M [GeForce GTX 1650 Mobile / Max-Q] [17aa:3ffb]
InstallationDate: Installed on 2020-03-12 (42 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200306)
MachineType: LENOVO 81T2
 PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-26-generic 
root=UUID=51068ea2-6b38-4cfc-a75f-4f404cd04685 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install) 11/23/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: BHCN35WW
dmi.board.asset.tag: NO Asset Tag LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0R32862 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Legion Y545 PG0
dmi:bvnLENOVO:bvrBHCN35WW:bd11/23/2019:svnLENOVO:pn81T2:pvrLegionY545PG0:rvnLENOVO:rnLNVNB161216:rvrSDK0R32862WIN:cvnLENOVO:ct10:cvrLegionY545PG0: Legion Y545 PG0 81T2
dmi.product.sku: LENOVO_MT_81T2_BU_idea_FM_Legion Y545 PG0
dmi.product.version: Legion Y545 PG0
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug focal ubuntu

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  Changing screen brightness fails

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