Public bug reported:
I have the same issue as described in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1197482. I have a
macbook running Ubuntu 15.04, and if I suspend and then unsuspend, then
my screen turns off when I set the brightness to to below 85%ish (4
presses of the brightness down key from full), and it's at full
brightness when it's anywhere above that. Brightness controls work
perfectly fine after booting before I ever suspend.
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-21-generic 3.19.0-21.21
ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
Uname: Linux 3.19.0-21-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: chris 1861 F.... pulseaudio
/dev/snd/controlC0: chris 1861 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Jul 5 19:46:00 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-06-08 (28 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: Apple Inc. MacBookAir6,2
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-21-generic.efi.signed
root=UUID=fa0b84b0-1cfd-4da2-963e-8fc448a0b636 ro rootflags=subvol=@ noprompt
persistent quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.19.0-21-generic N/A
linux-backports-modules-3.19.0-21-generic N/A
linux-firmware 1.143.1
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/07/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA61.88Z.0099.B18.1501071032
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-7DF21CB3ED6977E5
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookAir6,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-7DF21CB3ED6977E5
dmi.modalias:
dmi:bvnAppleInc.:bvrMBA61.88Z.0099.B18.1501071032:bd01/07/2015:svnAppleInc.:pnMacBookAir6,2:pvr1.0:rvnAppleInc.:rnMac-7DF21CB3ED6977E5:rvrMacBookAir6,2:cvnAppleInc.:ct10:cvrMac-7DF21CB3ED6977E5:
dmi.product.name: MacBookAir6,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug vivid
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https://bugs.launchpad.net/bugs/1471634
Title:
After suspend/resume, screen brightness can only be switched between 0
and 100%
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