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[Anthony Wong <anthony.wong@xxxxxxxxxx>]

** Changed in: hwe-next
       Status: Triaged => Won't Fix

** Changed in: hwe-next
     Assignee: AceLan Kao (acelankao) => (unassigned)

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https://bugs.launchpad.net/bugs/1353307

Title:
  [Lenovo B470e] Unable to control brightness on 12.04.5

Status in HWE Next:
  Won't Fix
Status in linux-lts-trusty package in Ubuntu:
  Confirmed

Bug description:
  CID: 201208-11587 Lenovo B470e

  This system was certified with 12.04.2
  http://www.ubuntu.com/certification/hardware/201208-11587/

  However, brightness control does not work on this system anymore.
  The brightness level indicator would change with hotkey events, but brightness itself does not.
  (This is an Intel UMA system)

  This issue could be found on many other Dell laptops as well

  ubuntu@201208-11587:~$ ls  /sys/class/backlight
  acpi_video0  intel_backlight

  ubuntu@201208-11587:~$ grep -r . /proc/acpi
  /proc/acpi/battery/BAT0/alarm:alarm:                   unsupported
  /proc/acpi/battery/BAT0/state:present:                 yes
  /proc/acpi/battery/BAT0/state:capacity state:          ok
  /proc/acpi/battery/BAT0/state:charging state:          charged
  /proc/acpi/battery/BAT0/state:present rate:            0 mW
  /proc/acpi/battery/BAT0/state:remaining capacity:      44460 mWh
  /proc/acpi/battery/BAT0/state:present voltage:         11373 mV
  /proc/acpi/battery/BAT0/info:present:                 yes
  /proc/acpi/battery/BAT0/info:design capacity:         48840 mWh
  /proc/acpi/battery/BAT0/info:last full capacity:      48560 mWh
  /proc/acpi/battery/BAT0/info:battery technology:      rechargeable
  /proc/acpi/battery/BAT0/info:design voltage:          11100 mV
  /proc/acpi/battery/BAT0/info:design capacity warning: 3395 mWh
  /proc/acpi/battery/BAT0/info:design capacity low:     1697 mWh
  /proc/acpi/battery/BAT0/info:cycle count:		  0
  /proc/acpi/battery/BAT0/info:capacity granularity 1:  1698 mWh
  /proc/acpi/battery/BAT0/info:capacity granularity 2:  45165 mWh
  /proc/acpi/battery/BAT0/info:model number:            L09M6Y02
  /proc/acpi/battery/BAT0/info:serial number:             601
  /proc/acpi/battery/BAT0/info:battery type:            LION
  /proc/acpi/battery/BAT0/info:OEM info:                SMP
  /proc/acpi/button/lid/LID0/state:state:      open
  /proc/acpi/wakeup:Device	S-state	  Status   Sysfs node
  /proc/acpi/wakeup:P0P1	  S4	*disabled
  /proc/acpi/wakeup:GLAN	  S4	*disabled
  /proc/acpi/wakeup:EHC1	  S3	*enabled   pci:0000:00:1d.0
  /proc/acpi/wakeup:EHC2	  S3	*enabled   pci:0000:00:1a.0
  /proc/acpi/wakeup:HDEF	  S4	*disabled  pci:0000:00:1b.0
  /proc/acpi/wakeup:RP01	  S4	*disabled  pci:0000:00:1c.0
  /proc/acpi/wakeup:RP02	  S4	*disabled  pci:0000:00:1c.1
  /proc/acpi/wakeup:PXSX	  S4	*disabled  pci:0000:02:00.0
  /proc/acpi/wakeup:RP03	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP04	  S4	*disabled  pci:0000:00:1c.3
  /proc/acpi/wakeup:PXSX	  S4	*enabled   pci:0000:03:00.0
  /proc/acpi/wakeup:RP05	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP06	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP07	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP08	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:PEG0	  S4	*disabled
  /proc/acpi/wakeup:PEGP	  S4	*disabled
  /proc/acpi/wakeup:PEG1	  S4	*disabled
  /proc/acpi/wakeup:PEG2	  S4	*disabled
  /proc/acpi/wakeup:PEG3	  S4	*disabled
  /proc/acpi/wakeup:LID0	  S3	*enabled 
  /proc/acpi/wakeup:SLPB	  S3	*enabled 
  ubuntu@201208-11587:~$ dmesg | grep 'ACPI: Video' 
  ubuntu@201208-11587:~$

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57~precise1 [modified: boot/vmlinuz-3.13.0-32-generic]
  ProcVersionSignature: Ubuntu 3.13.0-32.57~precise1-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Wed Aug  6 03:01:29 2014
  InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140801)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)

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