← Back to team overview

kernel-packages team mailing list archive

[Bug 1241982] Re: [MacBookAir6, 2] LED-Panel Brightness not adjustable after suspend/resume


spezimass, given that the fix for bug 1197451 has been released for
Saucy, could you please retest and advise on if this is reproducible in

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  [MacBookAir6,2] LED-Panel Brightness not adjustable after

Status in “linux” package in Ubuntu:

Bug description:
  Before suspend & resume the behaviour of the led-backlight pressing F1 or F2 key is adjustable. 
  Checking the register `/sys/class/backlight/intel_backlight/brightness` the range from 0 to 2770 can be operated in 21 steps.
  After resume still the full range is triggered with the F1 to F2 keys, but here the backlight is turned off completely for all values less than 2280 and fully turned on for all values greater 2290.

  Setting the brightness with `echo 2289 >
  /sys/class/backlight/intel_backlight/brightness` the led backlight
  starts to flicker in a period of approx 1sec.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19 [modified: boot/vmlinuz-3.11.0-12-generic]
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC1:  seba       1960 F.... pulseaudio
   /dev/snd/controlC0:  seba       1960 F.... pulseaudio
  Date: Sat Oct 19 11:49:38 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=d22df40a-a801-4e4f-a3ba-b3246e93d6db
  InstallationDate: Installed on 2013-10-17 (1 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Apple Inc. MacBookAir6,2
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic.efi.signed root=UUID=77b6a0d2-1d2f-480c-9e22-730bc9b73fed ro pcie_aspm=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 acpi_backlight=vendor
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/12/2013
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA61.88Z.0099.B01.1307121317
  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.B01.1307121317:bd07/12/2013: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.

To manage notifications about this bug go to: