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[Keng-Yu Lin <keng-yu.lin@xxxxxxxxxxxxx>]

** Changed in: hwe-next
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1407604

Title:
  [Dell Inspiron 7548] Brightness control does not work on 14.04.1

Status in HWE Next Project:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  CID: 201408-15450  Inspiron 7548

  Brightness control does not work on this system with 14.04.1
  The brightness level indicator would change with hotkey events, but the brightness itself does not.

  Debugging information:
  root@201408-15450:~$ ls /sys/class/backlight
  acpi_video0  intel_backlight

  root@201408-15450:~$ 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:          charging
  /proc/acpi/battery/BAT0/state:present rate:            474 mA
  /proc/acpi/battery/BAT0/state:remaining capacity:      3811 mAh
  /proc/acpi/battery/BAT0/state:present voltage:         13006 mV
  /proc/acpi/battery/BAT0/info:present:                 yes
  /proc/acpi/battery/BAT0/info:design capacity:         3900 mAh
  /proc/acpi/battery/BAT0/info:last full capacity:      3900 mAh
  /proc/acpi/battery/BAT0/info:battery technology:      non-rechargeable
  /proc/acpi/battery/BAT0/info:design voltage:          11400 mV
  /proc/acpi/battery/BAT0/info:design capacity warning: 390 mAh
  /proc/acpi/battery/BAT0/info:design capacity low:     0 mAh
  /proc/acpi/battery/BAT0/info:cycle count:		  0
  /proc/acpi/battery/BAT0/info:capacity granularity 1:  100 mAh
  /proc/acpi/battery/BAT0/info:capacity granularity 2:  0 mAh
  /proc/acpi/battery/BAT0/info:model number:            Dell
  /proc/acpi/battery/BAT0/info:serial number:           480
  /proc/acpi/battery/BAT0/info:battery type:            LION
  /proc/acpi/battery/BAT0/info:OEM info:                SIMPLO
  /proc/acpi/button/lid/LID0/state:state:      open
  /proc/acpi/ac_adapter/ADP1/state:state:                   on-line
  /proc/acpi/wakeup:Device	S-state	  Status   Sysfs node
  /proc/acpi/wakeup:RP01	  S4	*disabled  pci:0000:00:1c.0
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP04	  S4	*disabled  pci:0000:00:1c.3
  /proc/acpi/wakeup:PXSX	  S4	*disabled  pci:0000:07:00.0
  /proc/acpi/wakeup:RP05	  S4	*disabled  pci:0000:00:1c.4
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:EHC1	  S0	*enabled   pci:0000:00:1d.0
  /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 

  root@201408-15450:~$ dmesg | grep 'ACPI: Video'
  [    2.843516] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
  root@201408-15450:~$

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-43-generic 3.13.0-43.72
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1512 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1512 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Mon Jan  5 04:10:59 2015
  HibernationDevice: RESUME=UUID=87828d2c-0d30-454b-90f1-ed89c2790e76
  InstallationDate: Installed on 2015-01-05 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Inspiron 7548
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic.efi.signed root=UUID=4cf32401-def5-4cf9-a237-f0bfb729a6cc ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-43-generic N/A
   linux-backports-modules-3.13.0-43-generic  N/A
   linux-firmware                             1.127.10
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/19/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd11/19/2014:svnDellInc.:pnInspiron7548:pvrA00:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron 7548
  dmi.product.version: A00
  dmi.sys.vendor: Dell Inc.

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