display hangs when i use terminal and firefox

[Arpita Chopra]

Whenever i am using terminal anf firefox screen will be frozen, Some time i use alt+ctrl+down to defroze. In firefox i need to force shutdown.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: compiz-core 1:0.9.11.3+14.04.20160425-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-102.125~14.04.1-generic 4.4.98
Uname: Linux 4.4.0-102-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.27
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: Sun Dec 3 14:19:47 2017
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.13.0-136-generic, x86_64: installed
 bbswitch, 0.7, 4.4.0-102-generic, x86_64: installed
 fglrx-core, 15.201.2, 3.13.0-136-generic, x86_64: installed
 nvidia-304, 304.137, 3.13.0-136-generic, x86_64: installed
 nvidia-304, 304.137, 4.4.0-102-generic, x86_64: installed
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:05be]
 Advanced Micro Devices, Inc. [AMD/ATI] Mars XTX [Radeon HD 8790M] [1002:6606] (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:05be]
InstallationDate: Installed on 2016-03-28 (614 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: Dell Inc. Latitude E6540
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-102-generic.efi.signed root=UUID=7df88bed-bd25-4cf1-94b3-0698609aa8c4 ro quiet splash vt.handoff=7
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/19/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A21
dmi.board.name: 0HF9PT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA21:bd05/19/2017:svnDellInc.:pnLatitudeE6540:pvr00:rvnDellInc.:rn0HF9PT:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6540
dmi.product.version: 00
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11.3+14.04.20160425-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.14.04.2
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 2:1.15.1-0ubuntu2.11
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.7
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Sun Dec 3 09:50:14 2017
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 1085
 vendor LGD
xserver.version: 2:1.15.1-0ubuntu2.11