Chi-Thanh Christopher Nguyen, the next step is to fully commit bisect
from kernel 3.15-rc1 to 3.15-rc2 in order to identify the last good
kernel commit, followed immediately by the first bad one. This will
allow for a more expedited analysis of the root cause of your issue.
Could you please do this following
https://wiki.ubuntu.com/Kernel/KernelBisection ?

Please note, finding adjacent kernel versions is not fully commit
bisecting.

Also, the kernel release names are irrelevant for the purposes of
bisecting.

It is most helpful that after the fix commit (not kernel version) has
been identified, you then mark this report Status Confirmed.

Thank you for your help.

** Tags removed: kernel-bug-exists-upstream-3.15-rc2 
kernel-bug-exists-upstream-4.9.0
** Tags added: kernel-bug-exists-upstream-4.9 needs-bisect

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1651910

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

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Incomplete

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). Monitor connected via DVI.

  WORKAROUND: Boot with the old 3.14 kernel.
   
  ---
  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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