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[Bug 1575651] [NEW] X stops responding to input on power saving mode


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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.

The same system (kubuntu 16.04 64bit) on different hardware (nvidia) has
no problem.

The issue does NOT occur when running this kernel:
- linux-image-4.6.0-996-generic (4.6.0-996.201604262201)

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)

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

** Tags: amd64 apport-bug kde xenial
X stops responding to input on power saving mode
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