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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1555434

Title:
  Black screen/system lockup on 4.4.0-11

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  https://lists.ubuntu.com/archives/ubuntu-devel-
  discuss/2016-March/016281.html references xenial freezing when
  plugging in a 2nd monitor on a 2015 macbook pro.  I'm seeing similar
  freezes when _unplugging_ the 2nd monitor -- the screen turns black
  and everything is unresponsive.  Not sure that it happens every time,
  but have noticed it multiple times today (first time booting with
  4.4.0-11), and have not seen it before today (yesterday was booting
  4.4.0-10 and the freeze did not occur).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-11-generic 4.4.0-11.26
  ProcVersionSignature: Ubuntu 4.4.0-11.26-generic 4.4.4
  Uname: Linux 4.4.0-11-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jbarnett   2270 F.... pulseaudio
   /dev/snd/controlC1:  jbarnett   2270 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Wed Mar  9 20:31:07 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=dd225ec0-47f4-49d8-a51c-a2547f8eb945
  InstallationDate: Installed on 2015-08-21 (201 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150819)
  MachineType: Apple Inc. MacBookPro11,4
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-11-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-11-generic N/A
   linux-backports-modules-4.4.0-11-generic  N/A
   linux-firmware                            1.156
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-02-16 (22 days ago)
  dmi.bios.date: 06/05/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP114.88Z.0172.B04.1506051511
  dmi.board.name: Mac-06F11FD93F0323C5
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,4
  dmi.chassis.type: 9
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-06F11FD93F0323C5
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP114.88Z.0172.B04.1506051511:bd06/05/2015:svnAppleInc.:pnMacBookPro11,4:pvr1.0:rvnAppleInc.:rnMac-06F11FD93F0323C5:rvrMacBookPro11,4:cvnAppleInc.:ct9:cvrMac-06F11FD93F0323C5:
  dmi.product.name: MacBookPro11,4
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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