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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1477587

Title:
  One black screen of two when both on 1080p60

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Vivid:
  Confirmed

Bug description:
  One display turns off when both outputs are set to 1920x1080@60.0. They both still work separately on that rate.
  Forcing the one to "1920x1080@59.9" is functioning as a work-around.

  The good kernel version was linux_3.19.0-21.21.
  This Problem occurred in kernel linux_3.19.0-22.22 and linux_3.19.0-23.24.

  GPU is: Radeon HD 6670 using the radeon open source driver.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-23-generic 3.19.0-23.24
  ProcVersionSignature: Ubuntu 3.19.0-23.24-generic 3.19.8-ckt2
  Uname: Linux 3.19.0-23-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  andreas    3695 F.... pulseaudio
   /dev/snd/controlC1:  andreas    3695 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Jul 23 15:12:26 2015
  HibernationDevice: RESUME=UUID=4f0d7a88-5c8d-41c5-a44c-d195a257fd4e
  InstallationDate: Installed on 2012-04-11 (1198 days ago)
  InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.
  MachineType: Dell Inc. OptiPlex 755
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-23-generic root=UUID=4acbdc21-f685-460d-a0dc-f86e6f346bf3 ro plymouth:debug splash quiet drm.debug=0xe
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-23-generic N/A
   linux-backports-modules-3.19.0-23-generic  N/A
   linux-firmware                             1.143.2
  RfKill:

  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-04-27 (87 days ago)
  dmi.bios.date: 04/30/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0GM819
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd04/30/2008:svnDellInc.:pnOptiPlex755:pvr:rvnDellInc.:rn0GM819:rvr:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 755
  dmi.sys.vendor: Dell Inc.

  -----

  (From TJ):

  $ xrandr -q
  Screen 0: minimum 320 x 200, current 3600 x 1080, maximum 16384 x 16384
  HDMI-0 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
     1920x1080      60.0 *+  50.0     59.9     60.0
     1920x1080i     60.1     50.0     60.0
     1600x1200      60.0
     1680x1050      59.9
     1280x1024      75.0     60.0
     1440x900       59.9
     1280x960       60.0
     1366x768       59.8
     1152x864       75.0
     1280x720       60.0     50.0     59.9
     1024x768       75.1     70.1     60.0
     832x624        74.6
     800x600        72.2     75.0     60.3     56.2
     720x576        50.0
     720x480        60.0     59.9
     640x480        75.0     72.8     66.7     60.0     59.9
     720x400        70.1
  DVI-0 connected 1920x1080+1680+0 (normal left inverted right x axis y axis) 477mm x 268mm
     1920x1080      60.0*+
     1280x1024      75.0     60.0
     1152x864       75.0
     1024x768       75.1     60.0
     800x600        75.0     60.3
     640x480        75.0     60.0
     720x400        70.1
  VGA-0 disconnected (normal left inverted right x axis y axis)

  # workaround
  $ xrandr --output HDMI-0 --mode 1920x1080 --rate 59.9

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