Public bug reported:

The unity stopped to work at Administrator user.
 I tried to reinstall unity and compiz without success. 
Than I created another user, the unity graphics is working properly.  I felt 
the machine loose performance, it was faster before this fail.

The Administrator user I access just by terminal.

ThatÅ› all, not sure how to recover the Administrator unity screen to
work properly.

My best guess is that unity is working without laptop screen drivers. The 
screen driver is VGA. I did not find the VGA driver when I listed all by 
Below is the parcial result from LSMW command Drivers check out

 *-display UNCLAIMED

                description: VGA compatible controller

                product: 771/671 PCIE VGA Display Adapter

                vendor: Silicon Integrated Systems [SiS]

                physical id: 0

                bus info: pci@0000:01:00.0

                version: 10

                width: 32 bits

                clock: 66MHz

                capabilities: vga_controller cap_list

                configuration: latency=0

                resources: memory:c0000000-cfffffff
memory:d4000000-d401ffff ioport:9000(size=128)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.16.0-70.90~14.04.1-generic 3.16.7-ckt25
Uname: Linux 3.16.0-70-generic x86_64
.tmp.unity.support.test.1:
 
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
Date: Sat Apr 30 12:52:19 2016
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: I just need to know a workaround
GraphicsCard:
 Silicon Integrated Systems [SiS] 771/671 PCIE VGA Display Adapter [1039:6351] 
(rev 10) (prog-if 00 [VGA controller])
   Subsystem: COMPAL Electronics Inc Device [14c0:003a]
InstallationDate: Installed on 2015-05-19 (347 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-70-generic 
root=UUID=96f56811-f5f4-46bc-aa36-83e88f178a41 ro drm.debug=0xe plymouth:debug
Renderer: Software
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/16/2009
dmi.bios.version: 1.06
dmi.board.name: KSW01
dmi.board.version: REFERENCE
dmi.chassis.type: 10
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvn:bvr1.06:bd06/16/2009:svn:pn:pvr:rvn:rnKSW01:rvrREFERENCE:cvn:ct10:cvrN/A:
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 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: Sat Apr 30 11:42:57 2016
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.16.0-1ubuntu1.2~trusty2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 trusty ubuntu

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https://bugs.launchpad.net/bugs/1577004

Title:
  Graphic screen get totaly black

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