Interestingly if the back light turns off due to inactivity and not from
shutting the laptop the back light can be woken again like normal.
** Tags added: kernel-bug-exists-upstream kernel-bug-exists-
upstream-4.5-rc7
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1550905
Title:
[MacBookAir7,1] Backlight control broken. Won't turn on after suspend.
Status in linux package in Ubuntu:
Confirmed
Bug description:
The backlight on the MacBookAir7,1 can't be controlled, changing the
brightness setting has no effect on the actual screen brightness. If
you close the lid and the screen turns off it won't turn back on
again, the keyboard lights turn on and you can see the lcd is on if
you hold it to the light but the backlight won't turn back on.
Tested on Ubuntu 16.04 but it also affects 15.10
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-8-generic 4.4.0-8.23 [modified:
boot/vmlinuz-4.4.0-8-generic]
ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2
Uname: Linux 4.4.0-8-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: qwertie 1445 F.... pulseaudio
/dev/snd/controlC0: qwertie 1445 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Feb 28 21:32:12 2016
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=57c0320e-dc88-4126-9554-7d5e81efd9ca
InstallationDate: Installed on 2016-02-28 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160228)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 05ac:0290 Apple, Inc.
Bus 001 Device 006: ID 05ac:828f Apple, Inc.
Bus 001 Device 002: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part
of BCM2046 Bluetooth)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Apple Inc. MacBookAir7,1
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-8-generic.efi.signed
root=UUID=1db7d07c-799d-46d8-95d4-7f86fca35114 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.4.0-8-generic N/A
linux-backports-modules-4.4.0-8-generic N/A
linux-firmware 1.156
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/02/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA71.88Z.0166.B08.1509021746
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-9F18E312C5C2BF0B
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookAir7,1
dmi.chassis.asset.tag: Chassis Board Asset Tag#
dmi.chassis.type: 9
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-9F18E312C5C2BF0B
dmi.modalias:
dmi:bvnAppleInc.:bvrMBA71.88Z.0166.B08.1509021746:bd09/02/2015:svnAppleInc.:pnMacBookAir7,1:pvr1.0:rvnAppleInc.:rnMac-9F18E312C5C2BF0B:rvrMacBookAir7,1:cvnAppleInc.:ct9:cvrMac-9F18E312C5C2BF0B:
dmi.product.name: MacBookAir7,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
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