Another thing I just noticed : with or without the patch, the only thing
that works with two screen is the extended mode. When I try to go from
two screen extended to two screen clone mode, both screens switch off
and cannot be switched back on.

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https://bugs.launchpad.net/bugs/1577170

Title:
  screen cannot be turned back on after being switched off after some
  time of inactivity

Status in xserver-xorg-video-ati package in Ubuntu:
  Triaged

Bug description:
  I did a fresh install of ubuntu 16.04 on my old dell computer in which
  there is an ati radeon X1300 graphics card.

   Whenever the screen turns off due to inactivity, it cannot be woken
  up by moving the mouse or by hitting a key.

  When I kill the Xorg process via ssh with another computer, the screen
  then comes to life again and I can log back in.

  When I remove the graphic card from the computer and use the built in
  graphic card instead, the bug doesn't occur. So I guess it is related
  to the radeon driver.

  Oddly enough, there is no problem waking the screen when I type "xset 
-display :0.0 dpms force off" in a terminal. Moreover typing 
gnome-screensaver-command -a in a terminal turns my screen off and after typing 
this line, the screen can be woken up by moving the mouse or by hitting a key. 
I'm confused.
  --- 
  .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
  CurrentDesktop: Unity
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.0.18, 4.4.0-24-generic, x86_64: installed
   virtualbox, 5.0.18, 4.4.0-28-generic, x86_64: installed
  ExtraDebuggingInterest: No
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] RV516 [Radeon X1300/X1550 Series] 
[1002:7183] (prog-if 00 [VGA controller])
     Subsystem: Dell RV516 [Radeon X1300/X1550 Series] [1028:0302]
     Subsystem: Dell RV516 [Radeon X1300/X1550 Series] (Secondary) [1028:0303]
  InstallationDate: Installed on 2016-04-23 (71 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  MachineType: Dell Inc. Dell DM061
  Package: xorg 1:7.7+13ubuntu3
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-28-generic 
root=UUID=d8d495da-2071-481b-8e28-497d8eca9aff ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  Tags:  xenial ubuntu compiz-0.9
  Uname: Linux 4.4.0-28-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/24/2007
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.4.0
  dmi.board.name: 0WG864
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr2.4.0:bd05/24/2007:svnDellInc.:pnDellDM061:pvr:rvnDellInc.:rn0WG864:rvr:cvnDellInc.:ct6:cvr:
  dmi.product.name: Dell DM061
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.2+16.04.20160526-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
  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 2:1.18.3-1ubuntu2.2
  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
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2

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