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[Adrian <1509997@xxxxxxxxxxxxxxxxxx>]

I have reported the bug to Xorg developers ( [[Bug 92790 |
https://bugs.freedesktop.org/show_bug.cgi?id=92790]] ).

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https://bugs.launchpad.net/bugs/1509997

Title:
  Radeon MST bug

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

Bug description:
  The kernel was launched with the options: radeon.mst=1 radeon.dpm=1 (however, I noticed identical symptoms for radeon.mst enabled only)
  The setup in total includes 3 screens: laptop's one + 2 times Dell U2715H (connected by Display Port daisy chain)
  I get Ubuntu login GUI on two Dell screens, laptop's screens got off. The Dell screens are properly detected as separate: I can move mouse from one screen to another. Image on the last Dell screen is defected (blur) as in the attached picture. After login all screens switch to power safe mode.
  Afterwards, I'm able to switch to CLI (ALT+CTRL+F2) but screens is doubled on two Dells (they are treated as one), laptop's  screen remains off.

  In dmesg I found only information about error:
  [drm:radeon_mst_encoder_dpms [radeon]] *ERROR* DPMS OFF 0

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-video-radeon 1:7.5.0+git20150819-0ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  NonfreeKernelModules: openafs
  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  Date: Mon Oct 26 09:29:05 2015
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   openafs, 1.6.14, 4.2.0-16-generic, x86_64: installed
   vboxhost, 5.0.8, 4.2.0-16-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Venus XT [Radeon HD 8870M / R9 M270X/M370X] [1002:6821] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:2254]
  InstallationDate: Installed on 2015-04-02 (206 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Hewlett-Packard HP ZBook 15 G2
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro radeon.dpm=1 radeon.mst=1
  SourcePackage: xserver-xorg-video-ati
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/26/2015
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: M70 Ver. 01.07
  dmi.board.name: 2253
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 03.10
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrM70Ver.01.07:bd02/26/2015:svnHewlett-Packard:pnHPZBook15G2:pvrA3008CD10003:rvnHewlett-Packard:rn2253:rvrKBCVersion03.10:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ZBook 15 G2
  dmi.product.version: A3008CD10003
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Mon Oct 26 09:25:26 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9
  xserver.video_driver: radeon

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