Public bug reported:

sometimes when I boot up, the screen stays black. Only the mouse cursor
works, and control-alt-f1 gives a useable screen. Rebooting from there
usually gives me a clean bootup, but sometimes it takes several efforts.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.1
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: Sun Sep  4 15:57:31 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard: NVIDIA Corporation NV44 [GeForce 6200 TurboCache] [10de:0161] 
(rev a1) (prog-if 00 [VGA controller])
InstallationDate: Installed on 2016-08-15 (19 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 003: ID 152d:2338 JMicron Technology Corp. / JMicron USA 
Technology Corp. JM20337 Hi-Speed USB to SATA & PATA Combo Bridge
 Bus 002 Device 002: ID 0451:2046 Texas Instruments, Inc. TUSB2046 Hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic 
root=UUID=2acc9848-1f7b-48e3-ad25-0d953ae79051 ro
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/15/2006
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.50
dmi.board.asset.tag: 00000000
dmi.board.name: 939NF4G-SATA2
dmi.board.version: 1.00
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.50:bd03/15/2006:svn:pn939NF4G-SATA2:pvr1.00:rvn:rn939NF4G-SATA2:rvr1.00:
dmi.product.name: 939NF4G-SATA2
dmi.product.version: 1.00
version.compiz: compiz 1:0.9.12.2+16.04.20160801.3-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.3
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 
2:2.99.917+git20160325-1ubuntu1.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Sun Sep  4 15:56:01 2016
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        AT Translated Set 2 keyboard KEYBOARD, id 8
 input        ImExPS/2 Generic Explorer Mouse MOUSE, id 9
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.3-1ubuntu2.3
xserver.video_driver: nouveau

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


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

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1620065

Title:
  intermittent black screen on bootup

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