Public bug reported:
Backlight control does not work and there are no entries in
/sys/class/backlight. When I boot my system with the option
GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor" I can change the
brightness with the command xrandr on a terminal.
I attach all the system information about this problem.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-37-generic 4.13.0-37.42
ProcVersionSignature: Ubuntu 4.13.0-37.42-generic 4.13.13
Uname: Linux 4.13.0-37-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: victor 2932 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sat Mar 24 07:22:05 2018
InstallationDate: Installed on 2018-03-04 (19 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
MachineType: Apple Inc. MacBookAir3,2
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=es_ES.UTF-8
SHELL=/bin/bash
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-37-generic.efi.signed
root=UUID=dd2bcce2-7d14-4df7-b7c8-6aea4fbb9c13 ro acpi_backlight=vendor
RelatedPackageVersions:
linux-restricted-modules-4.13.0-37-generic N/A
linux-backports-modules-4.13.0-37-generic N/A
linux-firmware 1.169.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/18/10
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA31.88Z.0061.B01.1011181342
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-942C5DF58193131B
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookAir3,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-942C5DF58193131B
dmi.modalias:
dmi:bvnAppleInc.:bvrMBA31.88Z.0061.B01.1011181342:bd11/18/10:svnAppleInc.:pnMacBookAir3,2:pvr1.0:rvnAppleInc.:rnMac-942C5DF58193131B:rvrMacBookAir3,2:cvnAppleInc.:ct10:cvrMac-942C5DF58193131B:
dmi.product.family: MacBook
dmi.product.name: MacBookAir3,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug artful brightness
** Attachment added: "dsdt.dsl"
https://bugs.launchpad.net/bugs/1758496/+attachment/5088804/+files/dsdt.dsl
** Tags added: brightness
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https://bugs.launchpad.net/bugs/1758496
Title:
Backlight does not work on a MacBookAir3,2
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