brightness controller missing after installing nvidia-390

[vamsi krishna]

brightness controller gone after installing nvidia drivers

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 390.77 Tue Jul 10 18:28:52 PDT 2018
 GCC version: gcc version 7.3.0 (Ubuntu 7.3.0-27ubuntu1~18.04)
.tmp.unity_support_test.0:

ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 22 18:26:31 2018
DistUpgraded: 2018-09-13 00:30:24,004 DEBUG icon theme changed, re-reading
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus: nvidia, 390.77, 4.15.0-36-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation GF119M [GeForce 410M] [10de:1055] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Sony Corporation GF119M [GeForce 410M] [104d:908b]
InstallationDate: Installed on 2018-08-16 (66 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: Sony Corporation VPCEH3AEN
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-36-generic root=UUID=fd7306d2-c2eb-414c-bf34-7e6c72a1fe79 ro quiet splash acpi_backlight=vendor vt.handoff=1
SourcePackage: xorg
UpgradeStatus: Upgraded to bionic on 2018-09-12 (39 days ago)
dmi.bios.date: 11/17/2011
dmi.bios.vendor: INSYDE
dmi.bios.version: R0190Z9
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnINSYDE:bvrR0190Z9:bd11/17/2011:svnSonyCorporation:pnVPCEH3AEN:pvrC1074QWS:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.family: VAIO
dmi.product.name: VPCEH3AEN
dmi.product.version: C1074QWS
dmi.sys.vendor: Sony Corporation
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Mon Oct 22 17:22:30 2018
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.19.6-1ubuntu4

[Daniel van Vugt (vanvugt)]

It looks like your kernel command line has a custom backlight change, which is unusual:

[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-36-generic root=UUID=fd7306d2-c2eb-414c-bf34-7e6c72a1fe79 ro quiet splash acpi_backlight=vendor vt.handoff=1

Maybe try:
  1. Removing the "acpi_backlight=vendor" from /etc/default/grub
  2. sudo update-grub
  3. Reboot

[Launchpad Janitor (janitor)]

[Expired for nvidia-graphics-drivers-390 (Ubuntu) because there has been no activity for 60 days.]