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https://bugs.launchpad.net/bugs/1554509

Title:
  Screen remains black after resume from hibernation

Status in linux package in Ubuntu:
  Confirmed
Status in xserver-xorg-video-ati package in Ubuntu:
  New

Bug description:
  I am currently testing Xubuntu 16.04 beta. Hibernation does not work
  properly.

  I ran sudo pm-hibernate, then rebooted.
  The hibernation part itself seems to work nice.

  Resuming presents the following behaviour :
   - the booting sequence starts
   - the console shows the progress of the resuming process (10%, 20%, etc.)
   - my monitor switches to graphical mode like I would expect, but it then remains black instead of showing my desktop. It does not go to "sleep mode" like it does when the computer is off or the DVI cable is disconnected.

  The computer remains responsive, and if music was playing when
  hibernation started, it properly resumes. I can also use the keyboard
  (to run sudo reboot now, for example). Switching to another virtual
  console (Ctrl+Alt+1, Ctrl+Alt+7) does not improve the situation.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: pm-utils 1.4.1-16
  ProcVersionSignature: Ubuntu 4.4.0-10.25-generic 4.4.3
  Uname: Linux 4.4.0-10-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Tue Mar  8 14:03:50 2016
  InstallationDate: Installed on 2016-03-06 (2 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=fr_FR
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: pm-utils
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  yann       1556 F.... pulseaudio
   /dev/snd/controlC0:  yann       1556 F.... pulseaudio
   /dev/snd/controlC1:  yann       1556 F.... pulseaudio
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=574e9971-0906-47a9-9936-a1c6749b0d90
  InstallationDate: Installed on 2016-03-06 (5 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
  IwConfig:
   enp0s25   no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Dell Inc. Precision T1600
  Package: xserver-xorg-video-ati 1:7.6.1-1ubuntu2
  PackageArchitecture: amd64
  ProcEnviron:
   LANGUAGE=fr_FR
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-11-generic root=UUID=93ce274f-fa99-4a90-9081-7e70aeec5d83 ro
  ProcVersionSignature: Ubuntu 4.4.0-11.26-generic 4.4.4
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-11-generic N/A
   linux-backports-modules-4.4.0-11-generic  N/A
   linux-firmware                            1.156
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  Tags:  xenial xenial
  Uname: Linux 4.4.0-11-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 09/24/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A16
  dmi.board.name: 06NWYK
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA16:bd09/24/2013:svnDellInc.:pnPrecisionT1600:pvr01:rvnDellInc.:rn06NWYK:rvrA01:cvnDellInc.:ct6:cvr:
  dmi.product.name: Precision T1600
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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