Public bug reported:

Back-light sometimes fails to resume from suspend & screen brightness
sometimes will not dim below 100%

Issue is interment in occurrence. Will be reproducible with the command
"sudo pm-suspend" & or close/reopen laptop lid for a period of time days
or hours, then go a period of time, days or hours without being able to
trigger it again.

This is irrespective of running "apt-get update && apt-get upgrade -y"
and has continued to be intermittent on last 3 versions of 3.19 kernel.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.19.0-74.82~14.04.1-generic 3.19.8-ckt22
Uname: Linux 3.19.0-74-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Thu Dec  1 10:06:43 2016
DistUpgraded: Fresh install
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-trusty-amd64-osp1-20150721-1
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Device [8086:191b] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:06e5]
InstallationDate: Installed on 2016-11-22 (8 days ago)
InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 
20150721-23:28
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 04f3:21d4 Elan Microelectronics Corp. 
 Bus 001 Device 002: ID 8087:0a2b Intel Corp. 
 Bus 001 Device 004: ID 1bcf:2b95 Sunplus Innovation Technology Inc. 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Precision 5510
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-74-generic.efi.signed 
root=UUID=8eaa6744-6718-456a-bda0-762475144d35 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/31/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.2.14
dmi.board.name: 0W7V82
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.2.14:bd08/31/2016:svnDellInc.:pnPrecision5510:pvr:rvnDellInc.:rn0W7V82:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Precision 5510
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11.3+14.04.20160425-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri N/A
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Thu Dec  1 09:14:43 2016
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                5182 
 vendor                                     SHP
xserver.version: 2:1.17.1-0ubuntu3.1~trusty1.1

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


** Tags: amd64 apport-bug compiz-0.9 trusty ubuntu

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https://bugs.launchpad.net/bugs/1646537

Title:
  Backlight sometimes fails to resume from suspend & screen brightness
  sometimes will not dim below 100%

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1646537/+subscriptions

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