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[Launchpad Bug Tracker <1493989@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1493989

Title:
  After display goes to sleep, sometimes external monitor is black

Status in linux package in Ubuntu:
  Expired

Bug description:
  In a gnome session, my screen locks & turns off after a certain amount
  of inactivity (but the system is not in suspend).

  When I wake the display back up by moving mouse / hitting a key, it
  seems like my external monitor is redetected -- both internal &
  external screen blink black as if I had just plugged in my external
  monitor, and then _sometimes_ the external monitor stays black (but
  thinks it is receiving input).  Other times it's fine, but when the
  issue happens, the displays control panel still thinks the external
  screen is connected, just nothing is visible.  Unplugging & replugging
  the screen fixes the issue, and it happens maybe 1/2 the time the
  display locks.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2
  ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0
  Uname: Linux 4.2.0-7-generic x86_64
  ApportVersion: 2.18-0ubuntu9
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Wed Sep  9 13:05:10 2015
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 5.0.2, 4.2.0-7-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Crystal Well Integrated Graphics Controller [8086:0d26] (rev 08) (prog-if 00 [VGA controller])
     Subsystem: Apple Inc. Device [106b:0147]
  InstallationDate: Installed on 2015-08-21 (19 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
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-7-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  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.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.6.3-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.6.3-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Wed Sep  9 11:12:13 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               41006 
   vendor                                     APP
  xserver.version: 2:1.17.2-1ubuntu6

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