Public bug reported:

I am unable to adjust the brightness of the backlight of my laptop
screen either by using the slider of by changing the value in
/sys/class/backlight/intel_backlight/brightness directly.

I have tried changing my GRUB configuration:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
But that did not help.

I am using Ubuntu 19.10

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Uname: Linux 5.3.0-19-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  435.21  Sun Aug 25 08:17:57 
CDT 2019
 GCC version:  gcc version 9.2.1 20191008 (Ubuntu 9.2.1-9ubuntu2)
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov  8 14:03:33 2019
DistUpgraded: 2019-10-09 11:42:34,460 DEBUG Running PostInstallScript: 
DistroCodename: eoan
DistroVariant: ubuntu
 nvidia, 435.21, 5.3.0-19-generic, x86_64: installed
 virtualbox, 6.0.14, 5.3.0-18-generic, x86_64: installed
 virtualbox, 6.0.14, 5.3.0-19-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
 Intel Corporation UHD Graphics 630 (Mobile) [8086:3e9b] (prog-if 00 [VGA 
   Subsystem: CLEVO/KAPOK Computer UHD Graphics 630 (Mobile) [1558:65d1]
 NVIDIA Corporation TU106M [GeForce RTX 2070 Mobile] [10de:1f10] (rev a1) 
(prog-if 00 [VGA controller])
   Subsystem: CLEVO/KAPOK Computer TU106M [GeForce RTX 2070 Mobile] [1558:65d1]
InstallationDate: Installed on 2019-10-09 (30 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
MachineType: Notebook PB50_70RF,RD,RC
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-19-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash acpi_backlight=vendor 
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to eoan on 2019-10-09 (30 days ago) 02/01/2019
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 1.07.07
dmi.board.asset.tag: Tag 12345 PB50_70RF,RD,RC
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi:bvnINSYDECorp.:bvr1.07.07:bd02/01/2019:svnNotebook:pnPB50_70RF,RD,RC:pvrNotApplicable:rvnNotebook:rnPB50_70RF,RD,RC:rvrNotApplicable:cvnNotebook:ct10:cvrN/A: Not Applicable PB50_70RF,RD,RC
dmi.product.sku: Not Applicable
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.99-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 19.2.1-1ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug eoan ubuntu

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  Unable to adjust brightness of backlight

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