** Description changed:

  Once my session has been locked and the screen off, Xserver stops responding 
to input ( I can still move the cursor). I can re-activate it by typing in a 
tty "xset dpms force on".
  If I just lock the screen all works fine.
- If I just turn off the monitor (xset dpms force off) all works fine. 
+ If I just turn off the monitor (xset dpms force off) all works fine.
  
  The same system (kubuntu 16.04 64bit) on different hardware (nvidia) has
  no problem.
+ 
+ Symptoms:
+ After waking the screen from power saving/screensaver, the primary display 
wakes but X stops responding to input (the mouse cursor can still move, but 
clicking has no effect). Secondary display does not wake.
+ No errors in dmesg
+ 
+ Frequency/conditions:
+ Occurs almost every time the screen enters power saving + locked (possibly 
DPMS issue?)
+ 
+ VGA: Advanced Micro Devices, Inc. [AMD/ATI] Kabini [Radeon HD 8400 / R3
+ Series] (APU AMD Athlon 5350)
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg-video-radeon 1:7.7.0-1
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Wed Apr 27 14:00:52 2016
  InstallationDate: Installed on 2016-04-27 (0 days ago)
  InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  SourcePackage: xserver-xorg-video-ati
  UpgradeStatus: No upgrade log present (probably fresh install)

-- 
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which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1575651

Title:
  X stops responding to input on power saving mode

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