I can confirm this on a fresh install of Lubuntu 16.04 on a relatively
new laptop. This bug effectively renders the laptop useless.

Libreoffice crashes X regularly (!) and hence is not usable. When I look
at /var/log/syslog the culprit is always something like:

May  9 20:55:54 kermit kernel: [   46.807723] [drm] GPU HANG: ecode 
7:0:0x85fffdfc, in Xorg [812], reason: Ring hung, action: reset
May  9 20:55:54 kermit kernel: [   46.809807] drm/i915: Resetting chip after 
gpu hang

This seems to be a well known problem with the i915 driver. I've tried
some of the fixes that people suggest (adding various i915 options to
grub like i915.enable_rc6=0 i915.semaphores=0 i915.modeset=1
i915.use_mmio_flip=1 i915.enable_ppgtt=1). But so fare nothing works.

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https://bugs.launchpad.net/bugs/1575301

Title:
  GPU Hang [i915 / drm] crashes whole session; triggered by LibreOffice
  dialog boxes (regression)

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  This behavior began sometime in April 2016 (while using Ubuntu 16.04
  Beta 2, Unity) and has continued to the present.

  Dialog boxes in LibreOffice (including the automated recovery dialog
  on LO start) started displaying garbled text and garbled or missing
  button icons. Interacting with them -- or often even their appearance
  at all -- causes a rapid crash of the whole graphical session and a
  free trip back to the login screen.  Syslog shows a GPU hang (stuck on
  render ring).

  This is an Intel Core i7-4510U with Haswell-ULT Integrated Graphics
  Controller (HP Envy x360 convertible laptop).

  Before the upgrade from 15.10 to 16.04, I had the xorg-edgers
  repository enabled and then had used the installation tool from 01.org
  to install the Intel graphics stack.  As part of troubleshooting this,
  I have removed/purged the 01.org sources/packages/modules as best I
  could (16.04 not supported) and also disabled the edgers repository.
  This has not affected the bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  .tmp.unity_support_test.0:

  ApportVersion: 2.20.1-0ubuntu2
  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 Apr 26 14:04:07 2016
  DistUpgraded: 2016-03-26 18:47:13,658 DEBUG enabling apt cron job
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   fwts-efi-runtime-dkms, 16.03.00, 4.4.0-16-generic, x86_64: installed
   fwts-efi-runtime-dkms, 16.03.00, 4.4.0-18-generic, x86_64: installed
   fwts-efi-runtime-dkms, 16.03.00, 4.4.0-21-generic, x86_64: installed
   vboxhost, 5.0.18, 4.4.0-18-generic, x86_64: installed
   vboxhost, 5.0.18, 4.4.0-21-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] 
(rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Haswell-ULT Integrated Graphics 
Controller [103c:22d6]
  InstallationDate: Installed on 2014-08-10 (625 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
  MachineType: Hewlett-Packard HP ENVY 15 x360 PC
  PlymouthDebug: Error: [Errno 13] Permission denied: 
'/var/log/plymouth-debug.log'
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic.efi.signed 
root=UUID=5ad8035a-f2a4-4334-84d8-e2a8a7396bf8 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to xenial on 2016-03-26 (30 days ago)
  dmi.bios.date: 01/19/2015
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.26
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 22D6
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 89.23
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnInsyde:bvrF.26:bd01/19/2015:svnHewlett-Packard:pnHPENVY15x360PC:pvr0974100022405F00000420180:rvnHewlett-Packard:rn22D6:rvr89.23:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP ENVY 15 x360 PC
  dmi.product.version: 0974100022405F00000420180
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Tue Apr 26 14:02:01 2016
  xserver.configfile: default
  xserver.errors:
   Failed to load module "intel" (module does not exist, 0)
   Failed to load module "intel" (module does not exist, 0)
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.3-1ubuntu2
  xserver.video_driver: modeset

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