Adrian, you should be able to boot into xorg instead of Wayland via the
login screen.

** Changed in: xserver-xorg-video-ati (Ubuntu)
       Status: Confirmed => Incomplete

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  1002:6821 Graphical issues when radeon MST enabled

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

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.

  WORKAROUND: Use fglrx (tested with fglrx-installer-updates

  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 
  Date: Mon Oct 26 09:29:05 2015
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
   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
   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) 09/23/2015
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: M70 Ver. 01.12 2253
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 03.10
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
dmi:bvnHewlett-Packard:bvrM70Ver.01.07:bd02/26/2015:svnHewlett-Packard:pnHPZBook15G2:pvrA3008CD10003:rvnHewlett-Packard:rn2253:rvrKBCVersion03.10:cvnHewlett-Packard:ct10:cvr: HP ZBook 15 G2
  dmi.product.version: A3008CD10003
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:
  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 
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
  xserver.bootTime: Mon Oct 26 09:25:26 2015
  xserver.configfile: default

  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9
  xserver.video_driver: radeon

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