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[Rusty Shackleford <Shackleford071250@xxxxxxxxx>]

I'm going blind - I looked for a BIOS update and didn't find one.
However after updating my BIOS the problem still occurs: switching
between two user sessions results in a black screen. If anything the
problem is worse - much easier to duplicate as it now only takes a few
switches to trigger this bug now.

As per your request I ran: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date. The output of these commands is:
A12
02/18/2014

Marking this report as Status New.

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

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https://bugs.launchpad.net/bugs/1437557

Title:
  [Dell Vostro 3550] Black screen on user switch.

Status in xorg package in Ubuntu:
  New

Bug description:
  When switching users (primarly using Ctrl-Alt-F(7-10) the monitor will
  sometimes go black. This happens once or twice a day, although on
  occasion it doesn't occur for several days. It has occurred at least
  once a week since I installed Ubuntu 14.04.1. It seems to be more of a
  problem since moving to 14.04.2 - I did perform installation of the
  Utopic Kernel, X, and MesaGL packages, but this is only perception. At
  the same time I switched from Unity to Cinnamon (Jeremy Clarkson isn't
  the only dinosaur roaming the world) - but I have confirmed that just
  running Unity desktops is vunerable.

  The display can be restored by sudo service lightdm restart - run from
  an ssh login from another system.

  Steps to consistently reproduce the problem is simply to perform
  abusive user stress testing: switching from one user to another
  rapidly: as soon as the display switches go back to the other. Usually
  I can get a black screen with this method in under a minute with Unity
  desktops.

  I have the same issue with another system that I will log a defect
  against later.

  Currently attached is the dmesg log. I will come back in and add Xorg
  and i915 and regdumps.

  14.04.2 Trusty
  3.16.0-33-generic.
  I'll edit this report shortly with additional system info.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.16.0-33.44~14.04.1-generic 3.16.7-ckt7
  Uname: Linux 3.16.0-33-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.8
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Fri Mar 27 22:34:36 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:04cd]
   Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] [1002:6741] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2014-11-25 (122 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Vostro 3550
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-33-generic root=UUID=f2a7816d-d44b-4837-881c-51995c1f8a8b ro plymouth:debug splash quiet drm.debug=0xe
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/03/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0PD77K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A11
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA11:bd08/03/2012:svnDellInc.:pnVostro3550:pvrNotSpecified:rvnDellInc.:rn0PD77K:rvrA11:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Vostro 3550
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.11.3+14.04.20150122-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1~ubuntu2
  version.libgl1-mesa-dri: libgl1-mesa-dri N/A
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Fri Mar 27 22:24:12 2015
  xserver.configfile: default
  xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5539 
   vendor                                     CMO
  xserver.version: 2:1.16.0-1ubuntu1.2~trusty2

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