apport information

** Attachment added: "PulseList.txt"
   
https://bugs.launchpad.net/bugs/1915082/+attachment/5461462/+files/PulseList.txt

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https://bugs.launchpad.net/bugs/1915082

Title:
  [Macbook7,1] backlight not working

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Backlight controls do not have any effect on a Macbook7,1 running Ubuntu 
18.04.
  Ubuntu is installed in Legacy BIOS mode and uses the proprietary Nvidia 
drivers.
  The apple_backlight directory appears in /sys/class/backlight and while 
different brightness values can be set, they have no effect on the backlight's 
emitted brightness.
  The backlight remains at full brightness.

  I have tested the following kernel parameters but they have no effect.

  acpi_backlight=vendor
  video.use_bios_initial_backlight=0
  acpi_osi=
  video.use_native_backlight=1
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jordan     1659 F.... pulseaudio
  CurrentDesktop: Pantheon
  DistroRelease: elementary OS 5.1.7
  InstallationDate: Installed on 2021-01-30 (9 days ago)
  InstallationMedia: elementary OS 5.1 "hera" - stable amd64 (20200814)
  MachineType: Apple Inc. MacBook7,1
  NonfreeKernelModules: nvidia wl
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-65-generic 
root=UUID=6cdd2f7b-d747-4fbc-8062-317304a148a6 ro rootflags=subvol=@ quiet 
splash vt.handoff=1
  ProcVersionSignature: Ubuntu 5.4.0-65.73~18.04.1-generic 5.4.78
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-65-generic N/A
   linux-backports-modules-5.4.0-65-generic  N/A
   linux-firmware                            1.173.19
  Tags:  hera
  Uname: Linux 5.4.0-65-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: sudo
  WifiSyslog:
   
  _MarkForUpload: True
  dmi.bios.date: 02/02/18
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MB71.88Z.003F.B00.1802022149
  dmi.board.name: Mac-F22C89C8
  dmi.board.vendor: Apple Inc.
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F22C89C8
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMB71.88Z.003F.B00.1802022149:bd02/02/18:svnAppleInc.:pnMacBook7,1:pvr1.0:rvnAppleInc.:rnMac-F22C89C8:rvr:cvnAppleInc.:ct10:cvrMac-F22C89C8:
  dmi.product.family: MacBook
  dmi.product.name: MacBook7,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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