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[Bug 1381851] Re: [Dell Latitude E5550] Brightness control does not work on this system


but it will be great if it could pass with 3.13 kernel,
in that case, we won't need to deal with the kernel upgrade issue like what we're dealing with recently (3.5 / 3.8 / 3.11 -> 3.13)

However, we should wait and see how many blocker would be solved on this
system, then we decide if it's worth to fix it in 3.13.

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

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

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)

  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
  Uname: Linux 3.13.0-37-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
   /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
   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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