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[Bug 1416940] Re: [HP Pavilion dv6] Brightness control only work on the last two steps on 12.04.5


Alex, please check if the bios is incompatible with 3.13 wrt brightness.

Please note that either 12.04.2 or acpi_osi='!Windows 2012' are working

** Changed in: linux-lts-trusty (Ubuntu)
     Assignee: Anthony Wong (anthonywong) => Alex Hung (alexhung)

** Changed in: hwe-next
     Assignee: (unassigned) => Alex Hung (alexhung)

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

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  [HP Pavilion dv6] Brightness control only work on the last two steps
  on 12.04.5

Status in HWE Next Project:
Status in linux-lts-trusty package in Ubuntu:

Bug description:
  CID: 201209-11641  HP Pavilion dv6 Notebook PC

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

  Debugging information:
  ubuntu@201209-11641:~$ ls /sys/class/backlight
  acpi_video0  acpi_video1  intel_backlight

  ubuntu@201209-11641:~$ grep -r . /proc/acpi
  /proc/acpi/bbswitch:0000:01:00.0 ON
  /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 mA
  /proc/acpi/battery/BAT0/state:remaining capacity:      4878 mAh
  /proc/acpi/battery/BAT0/state:present voltage:         12642 mV
  /proc/acpi/battery/BAT0/info:present:                 yes
  /proc/acpi/battery/BAT0/info:design capacity:         4878 mAh
  /proc/acpi/battery/BAT0/info:last full capacity:      4878 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: 672 mAh
  /proc/acpi/battery/BAT0/info:design capacity low:     456 mAh
  /proc/acpi/battery/BAT0/info:cycle count:		  0
  /proc/acpi/battery/BAT0/info:capacity granularity 1:  216 mAh
  /proc/acpi/battery/BAT0/info:capacity granularity 2:  4206 mAh
  /proc/acpi/battery/BAT0/info:model number:            MO06062
  /proc/acpi/battery/BAT0/info:serial number:             133
  /proc/acpi/battery/BAT0/info:battery type:            LION
  /proc/acpi/battery/BAT0/info:OEM info:                12-32
  /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:P0P1	  S4	*disabled
  /proc/acpi/wakeup:KBD0	  S3	*enabled   pnp:00:07
  /proc/acpi/wakeup:PS2M	  S3	*disabled  pnp:00:08
  /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:XHC	  S3	*enabled   pci:0000:00:14.0
  /proc/acpi/wakeup:HDEF	  S0	*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
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP03	  S4	*disabled  pci:0000:00:1c.2
  /proc/acpi/wakeup:PXSX	  S4	*disabled  pci:0000:08:00.0
  /proc/acpi/wakeup:RP04	  S4	*disabled  pci:0000:00:1c.3
  /proc/acpi/wakeup:PXSX	  S4	*disabled  pci:0000:0a:00.0
  /proc/acpi/wakeup:RP05	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP06	  S5	*disabled  pci:0000:00:1c.5
  /proc/acpi/wakeup:PXSX	  S5	*enabled   pci:0000:0b:00.0
  /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  pci:0000:00:01.0
  /proc/acpi/wakeup:PEGP	  S4	*disabled  pci:0000:01:00.0
  /proc/acpi/wakeup:PEG1	  S4	*disabled
  /proc/acpi/wakeup:PEG2	  S4	*disabled
  /proc/acpi/wakeup:PEG3	  S4	*disabled
  /proc/acpi/wakeup:LID0	  S3	*enabled 

  ubuntu@201209-11641:~$ dmesg | grep 'ACPI: Video'
  [    8.457421] ACPI: Video Device [PEGP] (multi-head: yes  rom: yes  post: no)
  [    8.708920] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)

  Adding acpi_osi='!Windows 2012' could make it work.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-44-generic 3.13.0-44.73~precise1
  ProcVersionSignature: Ubuntu 3.13.0-44.73~precise1-generic 3.13.11-ckt12
  Uname: Linux 3.13.0-44-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-44-generic.
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: amd64
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: 92HD91BXX Analog [92HD91BXX Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   /dev/snd/controlC0:  ubuntu     2121 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
   Card hw:0 'PCH'/'HDA Intel PCH at 0x74610000 irq 47'
     Mixer name	: 'Intel PantherPoint HDMI'
     Components	: 'HDA:111d76e0,103c181b,00100102 HDA:80862806,103c1818,00100000'
     Controls      : 30
     Simple ctrls  : 12
  Date: Sun Feb  1 21:21:57 2015
  HibernationDevice: RESUME=UUID=44133aff-4b56-4bb1-bd96-812df1f33e5c
  InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140807.1)
  MachineType: Hewlett-Packard HP Pavilion dv6 Notebook PC
  MarkForUpload: True
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-44-generic root=UUID=a8ad3f48-e182-468f-b168-3a16c8cc9536 ro quiet splash
   linux-restricted-modules-3.13.0-44-generic N/A
   linux-backports-modules-3.13.0-44-generic  N/A
   linux-firmware                             1.79.18
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/02/2012
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.22
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 181B
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 52.24
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnInsyde:bvrF.22:bd11/02/2012:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr0791100200004710000620100:rvnHewlett-Packard:rn181B:rvr52.24:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP Pavilion dv6 Notebook PC
  dmi.product.version: 0791100200004710000620100
  dmi.sys.vendor: Hewlett-Packard

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