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[Vitaly Korolev <vitaly.korolev@xxxxxxxxx>]

I was able to update the BIOS (1.31 now) and also updated Ubuntu to 15.04.
The issue is still there and here is the output from the request command. (sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date)

L71 Ver. 01.31
03/24/2015

** Changed in: xorg (Ubuntu)
       Status: Expired => New

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https://bugs.launchpad.net/bugs/1386834

Title:
  Second display stops working on repeated detection

Status in xorg package in Ubuntu:
  New

Bug description:
  The first time a secondary display/projector is connected to my
  laptop, it is detected and works in mirrored mode. However, once I
  open System Settings > Displays, the seconday display gets disabled.
  Loging out and rebooting doesn't solve the problem. At least not right
  away. A few reboots later secondary display starts working again.
  Occasioally I'm able to use Fn+F4 to switch between different modes
  (mirrored, extended), but it usually doesn't last long. As soon as
  System Settings is activated, the secondary display is disable and no
  longer detected.

  Additional clues:
  1) If I leave a display plugged in and reboot, it is activated on login screen, but shuts off as soon as I login. Pressing 'Detect Displays' button is Displays settings does not bring it back.

  2)
  Every time I open System Settings (even without external displayed plugged in) there is a short lag and even the moust stops moving for about a second. The following shows up in the log:
  Oct 28 11:34:12 hostname kernel: [  649.193034] [drm] probing gen 2 caps for device 8086:9c18 = 5323c42/0
  Oct 28 11:34:12 hostname kernel: [  649.193038] [drm] PCIE gen 2 link speeds already enabled
  Oct 28 11:34:12 hostname kernel: [  649.197195] [drm] PCIE GART of 1024M enabled (table at 0x0000000000276000).
  Oct 28 11:34:12 hostname kernel: [  649.197453] radeon 0000:03:00.0: WB enabled
  Oct 28 11:34:12 hostname kernel: [  649.197455] radeon 0000:03:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff880432d0cc00
  Oct 28 11:34:12 hostname kernel: [  649.197457] radeon 0000:03:00.0: fence driver on ring 1 use gpu addr 0x0000000040000c04 and cpu addr 0xffff880432d0cc04
  Oct 28 11:34:12 hostname kernel: [  649.197458] radeon 0000:03:00.0: fence driver on ring 2 use gpu addr 0x0000000040000c08 and cpu addr 0xffff880432d0cc08
  Oct 28 11:34:12 hostname kernel: [  649.197459] radeon 0000:03:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff880432d0cc0c
  Oct 28 11:34:12 hostname kernel: [  649.197460] radeon 0000:03:00.0: fence driver on ring 4 use gpu addr 0x0000000040000c10 and cpu addr 0xffff880432d0cc10
  Oct 28 11:34:12 hostname kernel: [  649.198991] radeon 0000:03:00.0: fence driver on ring 5 use gpu addr 0x0000000000075a18 and cpu addr 0xffffc90012535a18
  Oct 28 11:34:12 hostname kernel: [  649.388989] [drm] ring test on 0 succeeded in 1 usecs
  Oct 28 11:34:12 hostname kernel: [  649.388994] [drm] ring test on 1 succeeded in 1 usecs
  Oct 28 11:34:12 hostname kernel: [  649.388998] [drm] ring test on 2 succeeded in 1 usecs
  Oct 28 11:34:12 hostname kernel: [  649.389009] [drm] ring test on 3 succeeded in 2 usecs
  Oct 28 11:34:12 hostname kernel: [  649.389016] [drm] ring test on 4 succeeded in 1 usecs
  Oct 28 11:34:12 hostname kernel: [  649.574547] [drm] ring test on 5 succeeded in 2 usecs
  Oct 28 11:34:12 hostname kernel: [  649.574553] [drm] UVD initialized successfully.
  Oct 28 11:34:12 hostname kernel: [  649.574583] [drm] ib test on ring 0 succeeded in 0 usecs
  Oct 28 11:34:12 hostname kernel: [  649.574610] [drm] ib test on ring 1 succeeded in 0 usecs
  Oct 28 11:34:12 hostname kernel: [  649.574637] [drm] ib test on ring 2 succeeded in 0 usecs
  Oct 28 11:34:12 hostname kernel: [  649.574664] [drm] ib test on ring 3 succeeded in 0 usecs
  Oct 28 11:34:12 hostname kernel: [  649.574692] [drm] ib test on ring 4 succeeded in 0 usecs
  Oct 28 11:34:13 hostname kernel: [  649.725287] [drm] ib test on ring 5 succeeded

  3)
  Some plugging and unplugging of the display occasionally shows the same messages in the log followed by the following:
  Oct 28 11:34:13 hostname kernel: [  649.734010] snd_hda_intel 0000:03:00.1: Enabling via VGA-switcheroo
  Oct 28 11:34:13 hostname kernel: [  649.734117] snd_hda_intel 0000:03:00.1: irq 70 for MSI/MSI-X
  Oct 28 11:34:18 hostname kernel: [  654.876455] snd_hda_intel 0000:03:00.1: Disabling via VGA-switcheroo
  Oct 28 11:34:18 hostname kernel: [  654.908444] snd_hda_intel 0000:03:00.1: Cannot lock devices!


  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xorg 1:7.7+7ubuntu2
  ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
  Uname: Linux 3.16.0-23-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Oct 28 11:26:19 2014
  DistUpgraded: 2014-10-24 11:32:59,179 DEBUG enabling apt cron job
  DistroCodename: utopic
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:198f]
   Advanced Micro Devices, Inc. [AMD/ATI] Mars [Radeon HD 8730M] [1002:6601] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1990]
  InstallationDate: Installed on 2014-10-06 (22 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Hewlett-Packard HP EliteBook 840 G1
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic.efi.signed root=UUID=e9a30923-65a7-4f5d-90ad-c34a241f1c73 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to utopic on 2014-10-24 (3 days ago)
  dmi.bios.date: 10/09/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L71 Ver. 01.04
  dmi.board.name: 198F
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 15.50
  dmi.chassis.asset.tag: CNU347DHK4
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.04:bd10/09/2013:svnHewlett-Packard:pnHPEliteBook840G1:pvrA3009DD10303:rvnHewlett-Packard:rn198F:rvrKBCVersion15.50:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 840 G1
  dmi.product.version: A3009DD10303
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Tue Oct 28 11:23:31 2014
  xserver.configfile: default
  xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4669
   vendor                                     AUO
  xserver.version: 2:1.16.0-1ubuntu1

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