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[Bug 1403792] [NEW] brightness of one of two screens no longer adjustable with hotkeys and menu

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Public bug reported:

Without noticible cause the brightness of the screen of my laptop is no
longer adjustable and stuck at the lowest level. Both the hotkey on my
keyboard and the brightness submenu in the system settings no longer
show any reaction to changes (i.e. key pressing and using the regulation
bar in the menu).

The issue persists accross reboots which makes the main screen of my
laptop unusable and it necessary to plug in an extra monitor!

I had this issue on an unknown version of Ubuntu < 14.10 and the
installation of `indicator-brightness` (https://launchpad.net
/~indicator-brightness/+archive/ubuntu/ppa) and setting the brightness
in it once to the lowest and then to the highest level fixed the issue
(persistently accross reboots), but now it doesn't show any reaction
neither (I adjusted the package soucres to point to `trusty` after `sudo
add-apt-repository ppa:indicator-brightness/ppa` in order to be able to
install in 14.10). When the issue occured `indicator-brightness` was not
installed.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: unity 7.3.1+14.10.20141016-0ubuntu1
Uname: Linux 3.17.6-031706-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.7-0ubuntu8
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
CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
Date: Thu Dec 18 10:06:33 2014
DistUpgraded: Fresh install
DistroCodename: utopic
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:3904]
MachineType: LENOVO 20221
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.17.6-031706-generic root=UUID=27047ee0-b60c-4dc6-8c14-f416b264f331 ro
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/12/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 71CN51WW(V1.21)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 31900003WIN8 STD MLT
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad Z500 Touch
dmi.modalias: dmi:bvnLENOVO:bvr71CN51WW(V1.21):bd07/12/2013:svnLENOVO:pn20221:pvrLenovoIdeaPadZ500Touch:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadZ500Touch:
dmi.product.name: 20221
dmi.product.version: Lenovo IdeaPad Z500 Touch
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.58+git20141201.f99522e6-0ubuntu0ricotz
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.0~git20141210.47aaabda-0ubuntu0ricotz~utopic
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.0~git20141210.47aaabda-0ubuntu0ricotz~utopic
version.xserver-xorg-core: xserver-xorg-core 2:1.16.1.901-1ubuntu1~utopic1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.99+git20140806.fbf575cb-0ubuntu0sarvatt3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.916+git20141215.99537089-0ubuntu0sarvatt~utopic
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11+git20141030.3fb97d78-0ubuntu0sarvatt
xserver.bootTime: Thu Dec 18 10:05:52 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                5557
 vendor                                     CMN
xserver.version: 2:1.16.1.901-1ubuntu1~utopic1

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


** Tags: amd64 apport-bug compiz-0.9 third-party-packages ubuntu utopic

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https://bugs.launchpad.net/bugs/1403792

Title:
  brightness of one of two screens no longer adjustable with hotkeys and
  menu

Status in unity package in Ubuntu:
  New

Bug description:
  Without noticible cause the brightness of the screen of my laptop is
  no longer adjustable and stuck at the lowest level. Both the hotkey on
  my keyboard and the brightness submenu in the system settings no
  longer show any reaction to changes (i.e. key pressing and using the
  regulation bar in the menu).

  The issue persists accross reboots which makes the main screen of my
  laptop unusable and it necessary to plug in an extra monitor!

  I had this issue on an unknown version of Ubuntu < 14.10 and the
  installation of `indicator-brightness` (https://launchpad.net
  /~indicator-brightness/+archive/ubuntu/ppa) and setting the brightness
  in it once to the lowest and then to the highest level fixed the issue
  (persistently accross reboots), but now it doesn't show any reaction
  neither (I adjusted the package soucres to point to `trusty` after
  `sudo add-apt-repository ppa:indicator-brightness/ppa` in order to be
  able to install in 14.10). When the issue occured `indicator-
  brightness` was not installed.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: unity 7.3.1+14.10.20141016-0ubuntu1
  Uname: Linux 3.17.6-031706-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.7-0ubuntu8
  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
  CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
  Date: Thu Dec 18 10:06:33 2014
  DistUpgraded: Fresh install
  DistroCodename: utopic
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:3904]
  MachineType: LENOVO 20221
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.17.6-031706-generic root=UUID=27047ee0-b60c-4dc6-8c14-f416b264f331 ro
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/12/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 71CN51WW(V1.21)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003WIN8 STD MLT
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Z500 Touch
  dmi.modalias: dmi:bvnLENOVO:bvr71CN51WW(V1.21):bd07/12/2013:svnLENOVO:pn20221:pvrLenovoIdeaPadZ500Touch:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadZ500Touch:
  dmi.product.name: 20221
  dmi.product.version: Lenovo IdeaPad Z500 Touch
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.58+git20141201.f99522e6-0ubuntu0ricotz
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.0~git20141210.47aaabda-0ubuntu0ricotz~utopic
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.0~git20141210.47aaabda-0ubuntu0ricotz~utopic
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.1.901-1ubuntu1~utopic1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.99+git20140806.fbf575cb-0ubuntu0sarvatt3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.916+git20141215.99537089-0ubuntu0sarvatt~utopic
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11+git20141030.3fb97d78-0ubuntu0sarvatt
  xserver.bootTime: Thu Dec 18 10:05:52 2014
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5557
   vendor                                     CMN
  xserver.version: 2:1.16.1.901-1ubuntu1~utopic1

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