kernel-packages team mailing list archive

[Yuan Chao <1279308@xxxxxxxxxxxxxxxxxx>]

No. Once reboot, the screen backlight brightness becomes normal (as
before boot into ubuntu), but the keyboard backlight remains maximum
even booted into OSX. However, the keyboard light level changes to the
previous state after pressing the hotkey. This means that the keyboard
light level is kept somewhere (nvram?) tough it is set to maximum at
ubuntu login.

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https://bugs.launchpad.net/bugs/1279308

Title:
  [MacBook Air 6,2] screen backlight brightness and keyboard light turn
  into fully-on after Grub boot with i915 driver

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Problem: Both the screen backlight brightness and keyboard light are
  turned on during the booting as tested on ubuntu 12.04.3, 12.04.4, and
  13.10. Due to installation problem on 12.04, it's only tested with the
  live system.

  What's expected: the brightness state before booting is preserved.

  Some trials: the problem should be on i915 driver even in single user mode. Tried "nomodeset" kerenel arguement can avoid the problem, but X will fail to start.
  --- 
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  john       1776 F.... pulseaudio
   /dev/snd/controlC1:  john       1776 F.... pulseaudio
  DistroRelease: Ubuntu 13.10
  InstallationDate: Installed on 2014-02-10 (1 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Apple Inc. MacBookAir6,2
  MarkForUpload: True
  NonfreeKernelModules: wl
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.11.0-15-generic.efi.signed root=UUID=b52fef82-3749-4624-a352-bd750dcb7e65 ro rootflags=subvol=@ quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-15.25-generic 3.11.10
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116
  Tags:  saucy
  Uname: Linux 3.11.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 11/12/2013
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA61.88Z.0099.B07.1311121319
  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.B07.1311121319:bd11/12/2013: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.

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