found the bug report https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1197451 no booting possible for previous releases to saucy.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1241982 Title: [MacBookAir6,2] LED-Panel Brightness not adjustable after suspend/resume Status in “linux” package in Ubuntu: Incomplete 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 AudioDevicesInUse: USER PID ACCESS COMMAND /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 RelatedPackageVersions: 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: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1241982/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp