I think there is another bug report very similar to this one, but can't
find it for now. I've never been able to use the stock ubuntu 16.04
kernel with my system (00:01.0 VGA compatible controller: Advanced Micro
Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7480D]) and need to compile a
patched kernel each time... Here are the 2 patches that resolve the
problem for me.

** Patch added: "(this is 1 of 2)"

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  16.04 -> AMD APU via VGA gives blank screen

Status in linux package in Ubuntu:

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):

  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
   /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)
   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
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.157
  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.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.

To manage notifications about this bug go to:

Mailing list: https://launchpad.net/~kernel-packages
Post to     : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

Reply via email to