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[monochromec <monochromec@xxxxxxxxx>]

Downloaded and installed 4.1 as suggested. Unfortunately not working
with similar symptoms. I attach the kernel log for reference.

** Attachment added: "boot.4.1.dmp"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1448458/+attachment/4385911/+files/boot.4.1.dmp

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https://bugs.launchpad.net/bugs/1448458

Title:
  3.19.15 crashes on MBP 8,1

Status in The Linux Kernel:
  Unknown
Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  Triaged
Status in linux source package in w-series:
  Incomplete

Bug description:
  Installation of 3.19.15 as part of Vivid upgrade causes machine to
  freeze after Lightdm has displayed login screen. Trackpad / keyboard /
  USB mouse don't work, machine isn't visible on network. Same happens
  with kernel versions 4.0, 4.0rc7 from the Ubuntu mainline kernel repo.
  Fan spins up audibly after 30 seconds of login screen display.

  Kernel versions 3.16.0-33 and 3.16.0-34 work out of the box.
  --- 
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  root        731 F.... pommed
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=b3b2afbf-edea-40c5-9506-44b7f0cbf4d2
  InstallationDate: Installed on 2014-04-26 (364 days ago)
  InstallationMedia: Lubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: Apple Inc. MacBookPro8,1
  NonfreeKernelModules: wl
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: \boot\vmlinuz-3.16.0-34-generic ro root=UUID=6a0139c1-488b-49e1-adee-a520c44dd9ab  quiet splash initrd=boot\initrd.img-3.16.0-34-generic
  ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-34-generic N/A
   linux-backports-modules-3.16.0-34-generic  N/A
   linux-firmware                             1.143
  Tags:  vivid
  Uname: Linux 3.16.0-34-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-04-24 (0 days ago)
  UserGroups:
   
  _MarkForUpload: True
  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-94245B3640C91C81
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro8,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-94245B3640C91C81
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,1:pvr1.0:rvnAppleInc.:rnMac-94245B3640C91C81:rvrMacBookPro8,1:cvnAppleInc.:ct10:cvrMac-94245B3640C91C81:
  dmi.product.name: MacBookPro8,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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