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[Launchpad Bug Tracker <1493989@xxxxxxxxxxxxxxxxxx>]

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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

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: amd64 apport-bug ubuntu wily
-- 
After display goes to sleep, sometimes external monitor is black
https://bugs.launchpad.net/bugs/1493989
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