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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Triaged

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Xenial)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1661695

Title:
  screen flickering raedon

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged

Bug description:
  4.4.0-53 WORKS FINE

  4.4.0-62 DOES NOT WORK (screen flickers)

  It seems there is a problem with powersafe:

  With auto:
  echo auto > /sys/class/drm/card0/device/power_dpm_force_performance_level

  you will see heavy screen flickering on higher display resolutions

  With low or high:
  echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level or
  echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level

  there is no screen flickering

  And having performance level set to HIGH at all times is not a
  workaround because it wears out the card. :(

  details:

  Linux CINNAMON 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC
  2017 x86_64 x86_64 x86_64 GNU/Linux

  ```
      Vendor: X.Org (0x1002)
      Device: AMD PITCAIRN (DRM 2.43.0 / 4.4.0-62-generic, LLVM 5.0.0) (0x6811)
      Version: 17.1.0
      Accelerated: yes
      Video memory: 2048MB
      Unified memory: no
      Preferred profile: core (0x1)
      Max core profile version: 4.2
      Max compat profile version: 3.0
      Max GLES1 profile version: 1.1
      Max GLES[23] profile version: 3.0
  OpenGL vendor string: X.Org
  OpenGL renderer string: Gallium 0.4 on AMD PITCAIRN (DRM 2.43.0 / 4.4.0-62-generic, LLVM 5.0.0)
  OpenGL core profile version string: 4.2 (Core Profile) Mesa 17.1.0-devel - padoka PPA
  OpenGL core profile shading language version string: 4.20
  OpenGL core profile context flags: (none)
  OpenGL core profile profile mask: core profile

  ```
  ---
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  atomi      3734 F.... pulseaudio
   /dev/snd/controlC0:  atomi      3734 F.... pulseaudio
   /dev/snd/controlC1:  atomi      3734 F.... pulseaudio
  CurrentDesktop: X-Cinnamon
  DistroRelease: Linux 18.1
  HibernationDevice: RESUME=UUID=30254b0c-14d7-4c0e-9168-a8d492fa027b
  InstallationDate: Installed on 2016-12-27 (37 days ago)
  InstallationMedia: Linux Mint 18.1 "Serena" - Release amd64 20161213
  MachineType: Gigabyte Technology Co., Ltd. GA-78LMT-USB3
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/usr/bin/zsh
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-53-generic root=UUID=41cc7dce-52e8-4b29-9347-60afc0a7d0ed ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-53-generic N/A
   linux-backports-modules-4.4.0-53-generic  N/A
   linux-firmware                            1.157.6
  RfKill:
   0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
  Tags:  serena
  Uname: Linux 4.4.0-53-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 04/23/2013
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: FA
  dmi.board.name: GA-78LMT-USB3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrFA:bd04/23/2013:svnGigabyteTechnologyCo.,Ltd.:pnGA-78LMT-USB3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-78LMT-USB3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-78LMT-USB3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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