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[Rusty Shackleford <Shackleford071250@xxxxxxxxx>]

The fix may be in kernel 3.19.0-25.26. I did build and install this
kernel and in subsequent stress testing (about 2 hours worth) was unable
to reproduce the defect. It's rare for me to not encounter the defect in
less than 5 minutes of stress testing - might have once made it to about
20 minutes - but never before to two hours. I'm not ready to call it
fixed though just yet.

To begin with I would like to get using an official build of the kernel.
As previously noted I was unable to install the 14.04.3 HWE stack that
contains this kernel.  Here is the command I ran and the problems
encountered:

sudo apt-get install --install-recommends linux-generic-lts-vivid
xserver-xorg-core-lts-vivid xserver-xorg-lts-vivid xserver-xorg-video-
all-lts-vivid xserver-xorg-input-all-lts-vivid libwayland-egl1-mesa-lts-
vivid

Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libcogl15 : Depends: libegl1-mesa-drivers
 libwayland-egl1-mesa-lts-vivid : Depends: libegl1-mesa-lts-vivid (= 10.5.2-0ubuntu1~trusty1) but it is not going to be installed
                                  Conflicts: xorg-renamed-package-lts-utopic
 xserver-xorg-core-lts-vivid : Depends: libgbm1-lts-vivid (>= 8.1~0) but it is not going to be installed
                               Recommends: libgl1-mesa-dri-lts-vivid (>= 7.10.2-4) but it is not going to be installed
                               Conflicts: xorg-renamed-package-lts-utopic
 xserver-xorg-input-all-lts-vivid : Depends: xserver-xorg-input-evdev-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-input-vmmouse-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-input-synaptics-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-input-wacom-lts-vivid but it is not going to be installed
 xserver-xorg-lts-vivid : Depends: xserver-xorg-input-evdev-lts-vivid but it is not going to be installed
                          Recommends: libgl1-mesa-dri-lts-vivid but it is not going to be installed
                          Recommends: libgl1-mesa-glx-lts-vivid but it is not going to be installed
                          Recommends: libegl1-mesa-lts-vivid but it is not going to be installed
                          Recommends: libegl1-mesa-drivers-lts-vivid but it is not installable
                          Recommends: libgbm1-lts-vivid but it is not going to be installed
                          Recommends: libgles2-mesa-lts-vivid but it is not going to be installed
                          Recommends: libgles1-mesa-lts-vivid but it is not going to be installed
                          Conflicts: libegl1-mesa (>= 0~)
                          Conflicts: libgl1-mesa-dri (>= 0~)
                          Conflicts: libgl1-mesa-glx (>= 0~)
                          Conflicts: libglapi-mesa (>= 0~)
                          Conflicts: libgles2-mesa (>= 0~)
                          Conflicts: xorg-renamed-package-lts-utopic
 xserver-xorg-video-all-lts-vivid : Depends: xserver-xorg-video-ati-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-cirrus-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-fbdev-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-intel-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-mga-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-neomagic-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-nouveau-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-openchrome-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-savage-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-siliconmotion-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-sisusb-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-tdfx-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-trident-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-vesa-lts-vivid but it is not going to be installed
                                    Depends: xserver-xorg-video-vmware-lts-vivid but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

I suppose I could just install the kernel - but I think it would be
better if I can keep the core system in sync with the LTS releases.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1437719

Title:
  [Dell Inspiron 5547] 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 (Dell Vostro 3550) reported
  in Bug #1437557 - submitting a new defect since this is different
  hardware and even though the defects look the same there might be
  differences underneath the hood causing the problem.

  
  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: Sat Mar 28 14:45:26 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:063e]
  InstallationDate: Installed on 2014-12-23 (95 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Inspiron 5547
  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=6eb0eadb-81ed-43ee-aab3-e3fe6b37ca75 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/12/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0598GM
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A05
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd08/12/2014:svnDellInc.:pnInspiron5547:pvrA05:rvnDellInc.:rn0598GM:rvrA00:cvnDellInc.:ct8:cvrA05:
  dmi.product.name: Inspiron 5547
  dmi.product.version: A05
  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 15:14:18 2015
  xserver.configfile: default
  xserver.errors:
   SynPS/2 Synaptics TouchPad: Read error 19
   SynPS/2 Synaptics TouchPad: Read error 19
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1110 
   vendor                                     LGD
  xserver.version: 2:1.16.0-1ubuntu1.2~trusty2

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