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[Björn Michaelsen <bjoern.michaelsen@xxxxxxxxxxxxx>]

To clarify again: This is first and foremost a Xorg/driver bug. As the
report claims this worked with Ubuntu 14.04 and presumably LibreOffice
4.2.x, but did not with Ubuntu 15.04 and presumably LibreOffice 4.4.x,
it might be helpful to fix the bug in Xorg to test LibreOffice 4.4.x
from the LibreOffice 4.4.x ppa on Ubuntu 14.04:

 https://launchpad.net/~libreoffice/+archive/ubuntu/libreoffice-4-4

Again: If the report is correct, this is shows that there is a bug in
Xorg or its drivers. While there might be a bug in LibreOffice too,
there is nothing in this bug report currently indicating that to be the
case at this point.

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https://bugs.launchpad.net/bugs/1468664

Title:
  Libreoffice crashing the whole session in 15.04

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  [Impact]

  I've looked around but couldn't find any bug post related to this
  issue, so I'm posting a new.

  Libreoffice is known to crash the entire session on certain AMD
  configurations, mine happens to be one of them.

  AMD A6-6310 APU w/ AMD Radeon R4 and R5 M230 graphics.

  Libreoffice worked perfect on 14.04.2 last time I checked, on 15.04
  it's unusable due to the crash.

  Whenever it happens I get:

  starting version 219
  [drm:radeon_acpi_init [radeon]] *ERROR* cannot find a backlight controller

  and the whole session crashes.

  [Test case]

  I've tried also other distributions and kernels. Kernel 3.18 on
  Manjaro Xfce seems to be unaffected. Previous versions on Ubuntu as
  well.

  Kernel 3.19.*+ on Ubuntu and Fedora are also affected. Antergos didn't
  even boot from the LiveCD because of this.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
  Uname: Linux 3.19.0-21-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Thu Jun 25 10:26:14 2015
  DistUpgraded: Fresh install
  DistroCodename: vivid
  DistroVariant: ubuntu
  ExtraDebuggingInterest: No
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Mullins [Radeon R4/R5 Graphics] [1002:9851] (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:381a]
  InstallationDate: Installed on 2015-06-20 (4 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: LENOVO 80E3
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-21-generic root=UUID=db4352a7-efc2-4393-bfe9-7804d7eb71fc ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/08/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: A2CN23WW(V1.05)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Lancer 5B2
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058 STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo G50-45
  dmi.modalias: dmi:bvnLENOVO:bvrA2CN23WW(V1.05):bd07/08/2014:svnLENOVO:pn80E3:pvrLenovoG50-45:rvnLENOVO:rnLancer5B2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoG50-45:
  dmi.product.name: 80E3
  dmi.product.version: Lenovo G50-45
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Sun Jun 21 09:24:57 2015
  xserver.configfile: default
  xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.1-0ubuntu3
  xserver.video_driver: radeon

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