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[Yung Shen <1351833@xxxxxxxxxxxxxxxxxx>]

I've also noticed this situation. But I think it's not really a bug but
a confused change made in power settings.

@sayantan13 can you check if you can also see the same results:

Steps to verify:

1. check "Dim screen to save power"

2. in "Turn screen off when inactive for", select "2 minutes"

And then wait for the system goes to inactive, you should see result
with follow progress:

normal -> system goes inactive (0s)  -> screen dim at 30% backlight
(1:30s) -> screen starting dimming again (1:50s) until black/off.

If you cannot see it dimming but it still goes to black screen, not
could possibility your backlight does not work at first place.

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https://bugs.launchpad.net/bugs/1351833

Title:
  [Lenovo FLex 2] Display backlight does not reduce after checking 'Dim
  screen to save power'

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  I am using Ubuntu 14.04.1 LTS  on Lenovo FLex 2. The laptop display backlight does not reduce even after selecting 'Dim screen to save power'  in the Battery Setttings.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sayantan   2009 F.... pulseaudio
   /dev/snd/controlC1:  sayantan   2009 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=ccdc92e5-9c8d-4e92-93d6-a300e775615b
  InstallationDate: Installed on 2014-07-28 (5 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 04f3:0333 Elan Microelectronics Corp. 
   Bus 001 Device 003: ID 0bda:b728 Realtek Semiconductor Corp. 
   Bus 001 Device 002: ID 5986:055e Acer, Inc 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20404
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic.efi.signed root=UUID=0705e595-a4d7-4cc8-8976-e8692f30f49e ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  Tags:  trusty
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 03/21/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: A0CN21WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Lenovo Flex 2-14
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900059 Std
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Flex 2-14
  dmi.modalias: dmi:bvnLENOVO:bvrA0CN21WW:bd03/21/2014:svnLENOVO:pn20404:pvrLenovoFlex2-14:rvnLENOVO:rnLenovoFlex2-14:rvr31900059Std:cvnLENOVO:ct10:cvrLenovoFlex2-14:
  dmi.product.name: 20404
  dmi.product.version: Lenovo Flex 2-14
  dmi.sys.vendor: LENOVO

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