apport information

** Tags added: apport-collected hera

** Description changed:

  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.

** Attachment added: "AlsaInfo.txt"
   
https://bugs.launchpad.net/bugs/1915082/+attachment/5461451/+files/AlsaInfo.txt

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

Title:
  [Macbook7,1] backlight not working

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