apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1915082/+attachment/5461464/+files/UdevDb.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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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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