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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

** Attachment added: "dsdt.dsl"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1381851/+attachment/4237835/+files/dsdt.dsl

** Also affects: hwe-next
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1381851

Title:
  [Dell Latitude E5550] Brightness control does not work on this system

Status in HWE Next Project:
  New
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  CID: 201406-15271 Dell Latitude E5550

  Brightness control does not work on this system
  The brightness level indicator would change with hotkey events, but the brightness itself does not.

  Debugging information:
  ubuntu@201406-15271:~$ ls /sys/class/backlight
  acpi_video0  intel_backlight

  ubuntu@201406-15271:~$ 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:          discharging
  /proc/acpi/battery/BAT0/state:present rate:            772 mA
  /proc/acpi/battery/BAT0/state:remaining capacity:      3170 mAh
  /proc/acpi/battery/BAT0/state:present voltage:         12493 mV
  /proc/acpi/battery/BAT0/info:present:                 yes
  /proc/acpi/battery/BAT0/info:design capacity:         3540 mAh
  /proc/acpi/battery/BAT0/info:last full capacity:      3372 mAh
  /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: 354 mAh
  /proc/acpi/battery/BAT0/info:design capacity low:     107 mAh
  /proc/acpi/battery/BAT0/info:cycle count:		  0
  /proc/acpi/battery/BAT0/info:capacity granularity 1:  35 mAh
  /proc/acpi/battery/BAT0/info:capacity granularity 2:  35 mAh
  /proc/acpi/battery/BAT0/info:model number:            DELL 9P4D246
  /proc/acpi/battery/BAT0/info:serial number:           226
  /proc/acpi/battery/BAT0/info:battery type:            LiP
  /proc/acpi/battery/BAT0/info:OEM info:                LGC-LGC3.4
  /proc/acpi/button/lid/LID0/state:state:      open
  /proc/acpi/ac_adapter/AC/state:state:                   off-line
  /proc/acpi/wakeup:Device	S-state	  Status   Sysfs node
  /proc/acpi/wakeup:PEG0	  S4	*disabled
  /proc/acpi/wakeup:PEGP	  S4	*disabled
  /proc/acpi/wakeup:PEG1	  S4	*disabled
  /proc/acpi/wakeup:PEGP	  S4	*disabled
  /proc/acpi/wakeup:PEG2	  S4	*disabled
  /proc/acpi/wakeup:PEGP	  S4	*disabled
  /proc/acpi/wakeup:RP01	  S4	*disabled  pci:0000:00:1c.0
  /proc/acpi/wakeup:PXSX	  S4	*disabled  pci:0000:01:00.0
  /proc/acpi/wakeup:RP02	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /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	*disabled  pci:0000:02:00.0
  /proc/acpi/wakeup:RP05	  S4	*disabled  pci:0000:00:1c.4
  /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:GLAN	  S4	*disabled  pci:0000:00:19.0
  /proc/acpi/wakeup:EHC1	  S0	*enabled   pci:0000:00:1d.0
  /proc/acpi/wakeup:EHC2	  S0	*disabled
  /proc/acpi/wakeup:XHC	  S0	*enabled   pci:0000:00:14.0
  /proc/acpi/wakeup:HDEF	  S4	*disabled  pci:0000:00:1b.0
  /proc/acpi/wakeup:LID0	  S3	*enabled 
  /proc/acpi/wakeup:PBTN	  S3	*enabled 

  ubuntu@201406-15271:~$ dmesg | grep 'ACPI: Video'
  [   12.986933] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
  ubuntu@201406-15271:~$

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-37-generic 3.13.0-37.64
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1530 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     1530 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Oct 15 23:03:45 2014
  HibernationDevice: RESUME=UUID=02cbc1f1-a261-484c-8fc2-05b68f73446d
  InstallationDate: Installed on 2014-10-09 (6 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Latitude E5550
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic root=UUID=d3b20ae5-9ff8-49b3-b640-1c6a9f264710 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.127.7
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/25/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: T43
  dmi.board.name: 0141B2
  dmi.board.vendor: Dell Inc.
  dmi.board.version: X02
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrT43:bd07/25/2014:svnDellInc.:pnLatitudeE5550:pvr01:rvnDellInc.:rn0141B2:rvrX02:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5550
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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