apport information

** Attachment added: "UdevDb.txt"
   https://bugs.launchpad.net/bugs/1651910/+attachment/4795134/+files/UdevDb.txt

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Title:
  radeon: black screen after upgrade from 14.04 to 16.04 on RS780

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After upgrading from Ubuntu 14.04 to 16.04, the screen will stay black
  after GRUB (backlight is on) when booting with the new 4.4 kernel
  (linux-image-4.4.0-57-generic).  Booting with the old 3.14 kernel will
  make the screen work again.

  This is on a BIOSTAR A780L mainboard, with the monitor connected via
  DVI.

  "ubuntu-bug linux" tells me that I appear to run a mainline kernel and
  cannot report anything (obviously, as the screen doesn't work if I
  boot the 16.04 kernel).

  $ cat /proc/version_signature > version.log
  cat: /proc/version_signature: No such file or directory

  1) The release of Ubuntu you are using, via 'lsb_release -rd' or
  System -> About Ubuntu

  $ lsb_release -rd
  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04

  2) The version of the package you are using, via 'apt-cache policy
  pkgname' or by checking in Software Center

  $ apt-cache policy linux-image-4.4.0-57-generic
  linux-image-4.4.0-57-generic:
    Installed: 4.4.0-57.78
    Candidate: 4.4.0-57.78
    Version table:
   *** 4.4.0-57.78 500
          500 http://de.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
          100 /var/lib/dpkg/status

  3) What you expected to happen

  Screen doesn't stay black

  4) What happened instead

  Screen stays black
  --- 
  ApportVersion: 2.20.1-0ubuntu2.4
  Architecture: amd64
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  PackageArchitecture: amd64
  Tags:  xenial
  Uname: Linux 3.14.79-031479-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-09-24 (88 days ago)
  UserGroups: adm admin cdrom dialout lpadmin nopasswdlogin plugdev sambashare
  _MarkForUpload: True
  --- 
  ApportVersion: 2.20.1-0ubuntu2.4
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/hwC0D2', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1p', 
'/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', 
'/dev/snd/hwC1D0', '/dev/snd/pcmC1D3p', '/dev/snd/controlC1', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=dbcee44e-5c4b-4630-a837-f819f42e91eb
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  MachineType: BIOSTAR Group A780L
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-32-generic 
root=UUID=da4d032c-4aef-42d0-bcf6-1cf98904be02 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.8.0-32.34~16.04.1-generic 4.8.11
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.8.0-32-generic N/A
   linux-backports-modules-4.8.0-32-generic  N/A
   linux-firmware                            1.157.6
  RfKill:
   
  Tags:  xenial
  Uname: Linux 4.8.0-32-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-09-24 (89 days ago)
  UserGroups: adm admin cdrom dialout lpadmin nopasswdlogin plugdev sambashare
  _MarkForUpload: True
  dmi.bios.date: 07/20/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 080014
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: A780L
  dmi.board.vendor: BIOSTAR Group
  dmi.chassis.asset.tag: None
  dmi.chassis.type: 3
  dmi.chassis.vendor: BIOSTAR Group
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr080014:bd07/20/2010:svnBIOSTARGroup:pnA780L:pvr:rvnBIOSTARGroup:rnA780L:rvr:cvnBIOSTARGroup:ct3:cvr:
  dmi.product.name: A780L
  dmi.sys.vendor: BIOSTAR Group

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