1) This has never been an issue, until upgrade to 16.04 LTS.
 a) These are not workarounds, this are just ways of manually starting the 
screen blank, without triggering the bug. If you let the screen blank 
automatically, bug will still trigger. And once the bug is triggered, only 
restart of the desktop manager helps.
 b) Yes, I have tested these scenarios personally.
3) I've tested the daily build and the issue is not present there.

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Touch seeded packages, which is subscribed to xorg in Ubuntu.

  screen cannot be turned back on after some time of inactivity

Status in xorg package in Ubuntu:

Bug description:
  When using my AMD Radeon X1300 card, if the screen turns off due to
  inactivity, it cannot be woken up by moving the mouse or by hitting a

  WORKAROUND: Type in a terminal:
  xset -display :0.0 dpms force off

  WORKAROUND: Typing the following 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:
  gnome-screensaver-command -a

  WORKAROUND: When I restart the display manager via ssh with another
  computer, the screen then comes to life again and I can log back in.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3.1
  ProcVersionSignature: Ubuntu 4.4.0-143.169-generic 4.4.170
  Uname: Linux 4.4.0-143-generic x86_64

  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CompizPlugins: No value set for 
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sun Mar 24 11:11:17 2019
  DistUpgraded: 2019-03-20 18:17:04,395 DEBUG icon theme changed, re-reading
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
   Advanced Micro Devices, Inc. [AMD/ATI] RV516 [Radeon X1300/X1550 Series] 
[1002:7187] (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd RV516 [Radeon X1300/X1550 Series] 
  InstallationDate: Installed on 2010-05-13 (3236 days ago)
  InstallationMedia: Ubuntu-Server 10.04 LTS "Lucid Lynx" - Release amd64 
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-143-generic 
root=/dev/mapper/orao-root ro rootfstype=ext4 quiet
  SourcePackage: xorg
  UpgradeStatus: Upgraded to xenial on 2019-03-20 (3 days ago)
  dmi.bios.date: 02/05/2009
  dmi.bios.vendor: FUJITSU SIEMENS // Phoenix Technologies Ltd.
  dmi.bios.version: 6.00 R1.18.2594.A1
  dmi.board.name: D2594-A1
  dmi.board.vendor: FUJITSU SIEMENS
  dmi.board.version: S26361-D2594-A1
  dmi.chassis.type: 3
  dmi.chassis.vendor: FUJITSU SIEMENS
  dmi.product.name: ESPRIMO E5720
  dmi.sys.vendor: FUJITSU SIEMENS
  version.compiz: compiz 1:
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.91-2~16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~16.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.8
  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 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
  xserver.bootTime: Sun Mar 24 11:06:06 2019
  xserver.configfile: default
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        Logitech USB Receiver KEYBOARD, id 8
   input        Logitech USB Receiver KEYBOARD, id 9

  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.4-0ubuntu0.8
  xserver.video_driver: radeon

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