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[R1dO <1573648@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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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:
  New

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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