Xorg crash with SIGSEGV GetTimeInMillis()

[gustavo]

Generally, when I open many pdf files (with acroread), the system logout and send me to logging initial screen. All file edition is lost, albeit this behaviour also, sometimes, occurs with ruotine task (chrome, libreoffice, etc). The automatic bug launchpad says that the logout is due a crahs of xorg-server-core 2:1.15.1-0ubuntu2.7

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.13.0-83.127-generic 3.13.11-ckt35
Uname: Linux 3.13.0-83-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.19
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: Fri Mar 25 17:29:22 2016
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:80bb]
InstallationDate: Installed on 2016-03-05 (20 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
Lsusb:
 Bus 001 Device 003: ID 05c8:0382 Cheng Uei Precision Industry Co., Ltd (Foxlink)
 Bus 001 Device 002: ID 8087:8001 Intel Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP Notebook
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-83-generic.efi.signed root=UUID=1a5424a8-04e4-41f0-a854-b12dc1e48ef8 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/13/2015
dmi.bios.vendor: Insyde
dmi.bios.version: F.14
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 80BB
dmi.board.vendor: HP
dmi.board.version: KBC Version 94.10
dmi.chassis.asset.tag: 5CG5395WPM
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.14:bd08/13/2015:svnHP:pnHPNotebook:pvrCNB1:rvnHP:rn80BB:rvrKBCVersion94.10:cvnHP:ct10:cvrChassisVersion:
dmi.product.name: HP Notebook
dmi.product.version: CNB1
dmi.sys.vendor: HP
version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1~ubuntu14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.6
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.6
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.6
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Fri Mar 25 17:29:04 2016
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 20034
 vendor SDC
xserver.version: 2:1.15.1-0ubuntu2.7