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[Alberto Salvia Novella <es20490446e@xxxxxxxxx>]

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1535452

Title:
  [15.10 REGRESSION] Builtin laptop display doesn't turn back on when
  external hdmi monitor is unplugged

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  I used to have my display settings so that only one external monitor
  would be used when available, and the laptop's builtin monitor would
  be disabled. When plugging and unplugging the external monitor
  (whether in the VGA or HDMI port), monitors would switch
  automatically, as is obviously expected.

  After upgrading from 15.04 to 15.10, as per bug #1535436, these
  settings were lost, and after reboot, the two monitors were both
  enabled in extended desktop mode (or whatever it's called).

  So I went to Settings -> Displays (while I had an HDMI monitor
  connected), and turned off the builtin display.

  That worked, but when unplugging the HDMI monitor, the builtin one
  remains turned off despite being the only available monitor. No matter
  how many times I plug and unplug the external HDMI monitor, the
  builtin one never turns on (the external one does work).

  This is a HUGE regression as it may leave you without screen.

  By plugging a monitor via the VGA port, it works as expected.

  I'm testing with the same monitors and cables (and computer) as I was
  using in 15.04 when everything worked fine.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
  Uname: Linux 4.2.0-23-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.96  Sun Nov  8 22:33:28 PST 2015
   GCC version:  gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2)
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Jan 18 22:18:48 2016
  DistUpgraded: 2016-01-18 11:11:01,146 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.19.0-43-generic, x86_64: installed
   bbswitch, 0.7, 4.2.0-23-generic, x86_64: installed
   nvidia-340, 340.96, 3.19.0-43-generic, x86_64: installed
   nvidia-340, 340.96, 4.2.0-23-generic, x86_64: installed
   vboxhost, 4.3.14: added
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:0647]
   NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
  InstallationDate: Installed on 2013-10-11 (829 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Acer Aspire V3-571G
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-23-generic.efi.signed root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to wily on 2016-01-18 (0 days ago)
  dmi.bios.date: 10/15/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.07
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: VA50_HC_CR
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.07
  dmi.modalias: dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
  dmi.product.name: Aspire V3-571G
  dmi.product.version: V2.07
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  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+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Mon Jan 18 17:01:13 2016
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   NVIDIA(0): Failed to initiate mode change.
   NVIDIA(0): Failed to complete mode change
   NVIDIA(0): Failed to initiate mode change.
   NVIDIA(0): Failed to complete mode change
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9.1

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