Public bug reported:

After my laptop goes from suspended state (sleep) I'm not able to adjust
screen brightness. It goes to maximum brightness and no longer adjusted
until laptop reboot. It's hard for my eyes to continue work. I don't
know is it xorg problem, or amdgpu but I will do my best to help you to
solve this issue.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
Uname: Linux 4.4.0-66-generic x86_64
NonfreeKernelModules: wl
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Fri Mar 17 20:09:53 2017
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus:
 amdgpu-pro, 16.60-379184, 4.4.0-66-generic, x86_64: installed
 bcmwl, 6.30.223.271+bdcom, 4.4.0-31-generic, x86_64: installed
 bcmwl, 6.30.223.271+bdcom, 4.4.0-64-generic, x86_64: installed
 bcmwl, 6.30.223.271+bdcom, 4.4.0-66-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Carrizo [1002:9874] (rev c4) (prog-if 
00 [VGA controller])
   Subsystem: Hewlett-Packard Company Carrizo [103c:80b5]
   Subsystem: Hewlett-Packard Company Topaz XT [Radeon R7 M260/M265] [103c:80b5]
InstallationDate: Installed on 2017-03-07 (10 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: HP HP Pavilion Notebook
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-66-generic 
root=UUID=433c8aa2-a343-4d03-8144-288b5cbc37f9 ro nopat vesafb.invalid=1 splash 
quiet
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/06/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F.13
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 80B5
dmi.board.vendor: HP
dmi.board.version: 81.28
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF.13:bd08/06/2015:svnHP:pnHPPavilionNotebook:pvr:rvnHP:rn80B5:rvr81.28:cvnHP:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion Notebook
dmi.sys.vendor: HP
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Fri Mar 17 20:03:39 2017
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-0ubuntu0.2
xserver.video_driver: amdgpu

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


** Tags: amd64 apport-bug ubuntu xenial

-- 
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https://bugs.launchpad.net/bugs/1673850

Title:
  Problem with video after suspend

Status in xorg package in Ubuntu:
  New

Bug description:
  After my laptop goes from suspended state (sleep) I'm not able to
  adjust screen brightness. It goes to maximum brightness and no longer
  adjusted until laptop reboot. It's hard for my eyes to continue work.
  I don't know is it xorg problem, or amdgpu but I will do my best to
  help you to solve this issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
  Uname: Linux 4.4.0-66-generic x86_64
  NonfreeKernelModules: wl
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Fri Mar 17 20:09:53 2017
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   amdgpu-pro, 16.60-379184, 4.4.0-66-generic, x86_64: installed
   bcmwl, 6.30.223.271+bdcom, 4.4.0-31-generic, x86_64: installed
   bcmwl, 6.30.223.271+bdcom, 4.4.0-64-generic, x86_64: installed
   bcmwl, 6.30.223.271+bdcom, 4.4.0-66-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Carrizo [1002:9874] (rev c4) (prog-if 
00 [VGA controller])
     Subsystem: Hewlett-Packard Company Carrizo [103c:80b5]
     Subsystem: Hewlett-Packard Company Topaz XT [Radeon R7 M260/M265] 
[103c:80b5]
  InstallationDate: Installed on 2017-03-07 (10 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  MachineType: HP HP Pavilion Notebook
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-66-generic 
root=UUID=433c8aa2-a343-4d03-8144-288b5cbc37f9 ro nopat vesafb.invalid=1 splash 
quiet
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/06/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F.13
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 80B5
  dmi.board.vendor: HP
  dmi.board.version: 81.28
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF.13:bd08/06/2015:svnHP:pnHPPavilionNotebook:pvr:rvnHP:rn80B5:rvr81.28:cvnHP:ct10:cvrChassisVersion:
  dmi.product.name: HP Pavilion Notebook
  dmi.sys.vendor: HP
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Fri Mar 17 20:03:39 2017
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.4-0ubuntu0.2
  xserver.video_driver: amdgpu

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