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

** Changed in: hwe-next
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1408592

Title:
  [Dell Vostro 5470] Unable to control brightness

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

Bug description:
  CID: 201307-14037  Vostro 5470

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

  There is a simliar bug reported before, bug 1333638 for 201307-14038,
  another Vostro 5470, but the brightness control works on that system
  because it has a discrete video card. For this UMA system, it doesn't
  work.

  == WORKAROUND ==
  Brightness would work with "acpi_osi=\"!Windows 2012\"" added to grub.
  Also verified on 201307-14038, this workaround won't affect its brightness control capability.

  Debugging information:
  ubuntu@201307-14037:~$ ls /sys/class/backlight
  acpi_video0  intel_backlight

  ubuntu@201307-14037:~$ 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:            1 mA
  /proc/acpi/battery/BAT0/state:remaining capacity:      4412 mAh
  /proc/acpi/battery/BAT0/state:present voltage:         12493 mV
  /proc/acpi/battery/BAT0/info:present:                 yes
  /proc/acpi/battery/BAT0/info:design capacity:         4520 mAh
  /proc/acpi/battery/BAT0/info:last full capacity:      4412 mAh
  /proc/acpi/battery/BAT0/info:battery technology:      non-rechargeable
  /proc/acpi/battery/BAT0/info:design voltage:          11100 mV
  /proc/acpi/battery/BAT0/info:design capacity warning: 441 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:           716
  /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/ADP0/state:state:                   on-line
  /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	  S4	*enabled   pci:0000:00:1d.0
  /proc/acpi/wakeup:EHC2	  S4	*disabled
  /proc/acpi/wakeup:XHC	  S4	*enabled   pci:0000:00:14.0
  /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:PXSX	  S4	*disabled
  /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  pci:0000:00:1c.2
  /proc/acpi/wakeup:PXSX	  S4	*enabled   pci:0000:07:00.0
  /proc/acpi/wakeup:RP04	  S4	*disabled  pci:0000:00:1c.3
  /proc/acpi/wakeup:PXSX	  S4	*disabled  pci:0000:08:00.0
  /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:LID0	  S3	*enabled 

  ubuntu@201307-14037:~$ dmesg | grep 'ACPI: Video'
  [   12.591778] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
  ubuntu@201307-14037:~$

  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/controlC0:  ubuntu     1458 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     1458 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Thu Jan  8 04:06:09 2015
  HibernationDevice: RESUME=UUID=2bba8b6d-4818-4d59-8187-613dffbe1088
  InstallationDate: Installed on 2014-12-29 (9 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Vostro 5470
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic root=UUID=b23b072b-a0ef-48de-bc97-3d66100bbc82 ro quiet splash "acpi_osi=!Windows 2012" 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                             1.127.11
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/23/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A01
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: White Tip Mountain
  dmi.board.vendor: Intel Corp.
  dmi.board.version: FAB3
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA01:bd08/23/2013:svnDellInc.:pnVostro5470:pvr:rvnIntelCorp.:rnWhiteTipMountain:rvrFAB3:cvnIntelCorporation:ct9:cvr0.1:
  dmi.product.name: Vostro 5470
  dmi.sys.vendor: Dell Inc.

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