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[Launchpad Bug Tracker <1450952@xxxxxxxxxxxxxxxxxx>]

[Expired for xserver-xorg-video-intel (Ubuntu) because there has been no
activity for 60 days.]

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1450952

Title:
  i915 backlight controls don't cover full range

Status in xserver-xorg-video-intel package in Ubuntu:
  Expired

Bug description:
  Hi. I'm using a Dell XPS 13 QHD+ (2015 version, model 9343), running
  Ubuntu Gnome 15.04.

  When I use the brightness control buttons to lower the backlight
  brightness, the lower end of the range (as reported by "cat
  /sys/class/backlight/intel_backlight/brightness") is as follows:

  0 (display off), 47, 94 ...

  However, I find 47 to still be too bright at night sometimes. I
  discovered that if I do "echo 1 >
  /sys/class/blacklight/intel_blacklight/brightness", I end up with a nice
  level of brightness which feels like it's about two steps down from 47 in
  terms of brightness.

  But there's no way to reach this brightness level using the brightness
  controls on the keyboard. Is it possible to add a couple of lower levels
  to the standard brightness range, changing [0, 47, 94, ...] to e.g. [0,
  1, 24, 47, 94, ...]?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Sat May  2 01:01:16 2015
  DistUpgraded: Fresh install
  DistroCodename: vivid
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:0665]
  InstallationDate: Installed on 2015-05-01 (0 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. XPS 13 9343
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic.efi.signed root=UUID=19a93ed2-e7c6-4e93-abd2-72761f3f6ad7 ro quiet splash "acpi_osi=!Windows 2013" vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/25/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0F5KF3
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd03/25/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0F5KF3:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  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.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: Fri May  1 23:50:50 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5153
   vendor                                     SHP
  xserver.version: 2:1.17.1-0ubuntu3

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