Public bug reported:

After upgrading from Saucy to Trusty, the 3.12.0-2 kernel doesn't fully
boot on my machine. I have to use the older 3.11 kernel to boot.

The 3.12.0 kernel tries to boot but then seems to fail at some stage.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.12.0-2-generic 3.12.0-2.5
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.12.6-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  shadeslayer   2482 F.... pulseaudio
 /dev/snd/controlC0:  shadeslayer   2482 F.... pulseaudio
Date: Wed Nov 13 16:56:49 2013
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=0d23fd6f-b835-411a-af8b-c1d7a07cbf91
InstallationDate: Installed on 2013-10-31 (12 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: Apple Inc. MacBookPro8,2
MarkForUpload: True
ProcFB:
 0 inteldrmfb
 1 radeondrmfb
ProcKernelCmdLine: \boot\vmlinuz-3.11.0-12-generic ro 
root=UUID=ff872e15-889d-4f71-b33f-176cf27e2f12 
initrd=boot\initrd.img-3.11.0-12-generic
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-12-generic N/A
 linux-backports-modules-3.11.0-12-generic  N/A
 linux-firmware                             1.117
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2013-10-31 (12 days ago)
dmi.bios.date: 01/24/12
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP81.88Z.0047.B27.1201241646
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-94245A3940C91C80
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro8,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-94245A3940C91C80
dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,2:pvr1.0:rvnAppleInc.:rnMac-94245A3940C91C80:rvrMacBookPro8,2:cvnAppleInc.:ct10:cvrMac-94245A3940C91C80:
dmi.product.name: MacBookPro8,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1250909

Title:
  Trusty linux kernel 3.12.0-2 doesn't boot on Macbook Pro 8,2

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