apport information

** Attachment added: "RfKill.txt"
   https://bugs.launchpad.net/bugs/1768152/+attachment/5131515/+files/RfKill.txt

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https://bugs.launchpad.net/bugs/1768152

Title:
  Brightness controll doesn't work - Samsung R560

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  I just migrated from Gentoo Linux to KUbuntu 18.04 LTS. Now I noticed
  that brightness control doesn't work in Ubuntu (FN Keys show KDE
  Dialog Brightness changed but display stays at full Backlight). Even
  writing to /sys/class/backlight/acpi_video0/brightness doesn't change
  the brightness level. In Gentoo everything was working fine, display
  backlight responded to KDE and/or to /sys/class/backlight/... . As I
  now I had a bug Ticket at Kernel org with user Tux12Fun an it was
  implemented long time ago into the Kernel Main Line. But I can't find
  the Ticket on Kernel.org now :-(

  So I try to provide all the information i can collect from the old
  installation.

  Hardware: Samsung R560 Laptop
  Model: NP-R560-AS05DE

  Gentoo Kernel:        linux-4.4.67-gentoo
  Gentoo Video Driver:  original Nvidia 340.106 with Gentoo Kernel Patch 
nvidia-drivers-381.09-v3.patch

  
  Ubuntu Kernel: 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux
  Ubuntu Video Driver:   NVidia 390.42

  root@rechner4:/# lsb_release -rd
  Description:    Ubuntu 18.04 LTS
  Release:        18.04

  lspci -vvv attached.
  Kernel Config of my old Gentoo attached.

  I hope we can mange it to get backlight control working on Ubuntu as
  it's nearly inpossible to work with full backlight at night :-(

  Thank you for your work.

  Best regards form Bavaria

  Tux12Fun (Thomas)
  --- 
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  thomas     1205 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2018-04-30 (0 days ago)
  InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 
(20180426)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. R560
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic 
root=UUID=7ca20d22-7baa-4892-a8a3-cd0e628190bc ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-20-generic N/A
   linux-backports-modules-4.15.0-20-generic  N/A
   linux-firmware                             1.173
  Tags:  bionic
  Uname: Linux 4.15.0-20-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/09/2008
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: 09LA.7027.20081209.JJC
  dmi.board.name: R560
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLtd.:bvr09LA.7027.20081209.JJC:bd12/09/2008:svnSAMSUNGELECTRONICSCO.,LTD.:pnR560:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR560:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
  dmi.product.name: R560
  dmi.product.version: Not Applicable
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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