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[Bug 1452173] [NEW] [Dell Precision M4800] Regression: screen brightness control broken in 15.04

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Public bug reported:

In Ubuntu 15.04, I no longer am able to control the screen brightness.
See possible similar bug #1411514 for 14.04.1.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  346.59  Tue Mar 31 14:10:31 PDT 2015
 GCC version:  gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop:
 
Date: Wed May  6 10:12:03 2015
DistUpgraded: 2015-04-24 01:12:19,566 DEBUG enabling apt cron job
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-precise-amd64-20130203-1
DistroCodename: vivid
DistroVariant: ubuntu
EcryptfsInUse: Yes
GraphicsCard:
 NVIDIA Corporation GK106GLM [Quadro K2100M] [10de:11fc] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:05cc]
InstallationDate: Installed on 2014-03-12 (419 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50
MachineType: Dell Inc. Precision M4800
PlymouthDebug: Error: [Errno 13] Permission denied: '/var/log/plymouth-debug.log'
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic.efi.signed root=UUID=61c860cd-d55d-4e70-85a3-615b677b5811 ro nomodeset=1 splash quiet plymouth:debug=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to vivid on 2015-04-23 (12 days ago)
dmi.bios.date: 12/03/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 077KCT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA11:bd12/03/2014:svnDellInc.:pnPrecisionM4800:pvr01:rvnDellInc.:rn077KCT:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Precision M4800
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
xserver.bootTime: Tue May  5 22:22:48 2015
xserver.configfile: default
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.17.1-0ubuntu3

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

** Affects: nvidia-graphics-drivers-346-updates (Ubuntu)
     Importance: Undecided
         Status: New

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


** Tags: amd64 apport-bug possible-manual-nvidia-install regression-release ubuntu vivid

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: nvidia-graphics-drivers-346-updates (Ubuntu)
   Importance: Undecided
       Status: New

** Tags added: regression-release

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https://bugs.launchpad.net/bugs/1452173

Title:
  [Dell Precision M4800] Regression: screen brightness control broken in
  15.04

Status in linux package in Ubuntu:
  New
Status in nvidia-graphics-drivers-346-updates package in Ubuntu:
  New
Status in xorg package in Ubuntu:
  New

Bug description:
  In Ubuntu 15.04, I no longer am able to control the screen brightness.
  See possible similar bug #1411514 for 14.04.1.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  346.59  Tue Mar 31 14:10:31 PDT 2015
   GCC version:  gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop:
   
  Date: Wed May  6 10:12:03 2015
  DistUpgraded: 2015-04-24 01:12:19,566 DEBUG enabling apt cron job
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20130203-1
  DistroCodename: vivid
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  GraphicsCard:
   NVIDIA Corporation GK106GLM [Quadro K2100M] [10de:11fc] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:05cc]
  InstallationDate: Installed on 2014-03-12 (419 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50
  MachineType: Dell Inc. Precision M4800
  PlymouthDebug: Error: [Errno 13] Permission denied: '/var/log/plymouth-debug.log'
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic.efi.signed root=UUID=61c860cd-d55d-4e70-85a3-615b677b5811 ro nomodeset=1 splash quiet plymouth:debug=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to vivid on 2015-04-23 (12 days ago)
  dmi.bios.date: 12/03/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 077KCT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA11:bd12/03/2014:svnDellInc.:pnPrecisionM4800:pvr01:rvnDellInc.:rn077KCT:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Precision M4800
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Tue May  5 22:22:48 2015
  xserver.configfile: default
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.17.1-0ubuntu3

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