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["R. Becke" <subscribe.becke@xxxxxxxxx>]

The same happened to me. I did the upgrade 15.10->16.04 while my laptop was docked into the "HP 2013 UltraSlim-Dockingstation" and at some point during the upgrade my screen went black and so I decided to reboot. And from this point on I could not get my 16.04 system working anymore so I decided to do a 16.04 installation from scratch. Now I can at least work on my laptop standalone but as soon as I try to dock I get the exception in syslog shown above. The weird thing is that in the Display Manager dialog my external Acer Monitor is detected but no output gets displayed.
One further "famous" error I get in syslog is: "radeon 0000:03:00.0: VCE init error (-110)" - so hopefully this gets solved as well with the upgrade.
Will try the kernel upgrade asap.

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https://bugs.launchpad.net/bugs/1573648

Title:
  16.04 -> AMD APU via VGA gives blank screen

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  After upgrade to 16.04, the system will only show a blank screen when a monitor is connected to the VGA output.
  The system itself is able to completely start-up (checked via a ssh login).

  Starting up using an older kernel (in this case 4.2.0) gives a
  functional graphical system.

  Possibly related dmesg lines (when booting 4.4.0):
    kernel: [    9.131059] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery reached max voltage
    kernel: [    9.131088] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed

  It might be related to the following kernel post (but i am not entirely sure):
    https://lists.freedesktop.org/archives/dri-devel/2016-March/102222.html

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  rene       2014 F.... pulseaudio
   /dev/snd/controlC0:  rene       2014 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Apr 22 16:29:44 2016
  HibernationDevice: RESUME=UUID=98dbb6ee-ff08-4e9f-b01d-55b2f28c6a1e
  InstallationDate: Installed on 2015-12-29 (114 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  IwConfig:
   lo        no wireless extensions.
   
   enp1s0    no wireless extensions.
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic.efi.signed root=/dev/mapper/VGelmo-LVroot ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.157
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-21 (0 days ago)
  dmi.bios.date: 12/04/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.90
  dmi.board.name: FM2A68M-HD+
  dmi.board.vendor: ASRock
  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.:bvrP1.90:bd12/04/2015:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnFM2A68M-HD+:rvr: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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