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[Christophe <1575651@xxxxxxxxxxxxxxxxxx>]

Muriel, I have the same problem as yours. I tried the latest kernel to
no avail. Do the new kernel work for you ?

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https://bugs.launchpad.net/bugs/1575651

Title:
  X stops responding to input on power saving mode

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  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.

  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).
  No errors in dmesg

  Frequency/conditions:
  Occurs almost every time the screen enters power saving + locked (possibly DPMS issue?)

  The issue does NOT occur when running this kernel:
  - linux-image-4.6.0-996-generic (4.6.0-996.201604262201)
  - linux-image-4.6.0-040600rc6-generic_4.6.0-040600rc6

  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)
  ---
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  mu         2199 F.... pulseaudio
   /dev/snd/controlC0:  mu         2199 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=28fb5b79-ea0d-4356-a118-aacacfa8e0af
  InstallationDate: Installed on 2016-04-27 (3 days ago)
  InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  IwConfig:
   enp2s0    no wireless extensions.

   lo        no wireless extensions.
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37 [modified: boot/vmlinuz-4.4.0-21-generic]
  PackageArchitecture: amd64
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed root=UUID=393ef973-c324-4b1b-9bef-d6f55bcdd242 ro noprompt persistent quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  RfKill:

  Tags:  xenial
  Uname: Linux 4.4.0-21-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 04/29/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.50
  dmi.board.name: AM1H-ITX
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.50:bd04/29/2015:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnAM1H-ITX:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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