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[Olivier Caro <1499491@xxxxxxxxxxxxxxxxxx>]

I have successfully installed and booted the kernel from /~kernel-ppa/mainline/v4.3-rc3-unstable
The behaviour is still the same: The display connected on DisplayPort keeps being black.

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

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Title:
  Display connected on DisplayPort turns black during boot and never
  returns

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  The display connected on my R9 290 through DisplayPort connection
  turns black during boot and never comes back again.

  According to the power led, it is up and does not turn into power
  saving mode.

  According to xorg.0.log and System Settings / Display  the display is
  perfectly detected.

  This display worked perfectly fine using the same DisplayPort cable,
  running the same driver on my Radeon HD 6670.

  Description:	Ubuntu 15.04
  Release:	15.04
  --- 
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  olivier    2403 F.... pulseaudio
   /dev/snd/controlC2:  olivier    2403 F.... pulseaudio
   /dev/snd/controlC1:  olivier    2403 F.... pulseaudio
   /dev/snd/seq:        timidity   1672 F.... timidity
  DistroRelease: Ubuntu 15.04
  EcryptfsInUse: Yes
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  Package: linux (not installed)
  ProcFB:
   0 radeondrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic root=/dev/mapper/vg0-root ro radeon.auxch=0 init=/lib/systemd/systemd-bootchart
  ProcVersionSignature: Ubuntu 3.19.0-30.33-generic 3.19.8-ckt6
  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-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.143.3
  RfKill:
   
  Tags:  vivid
  Uname: Linux 3.19.0-30-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-04-30 (149 days ago)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 04/09/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2501
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A97 LE R2.0
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  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.:bvr2501:bd04/09/2014:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A97LER2.0:rvrRev1.xx: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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