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

Verified with "acpi_backlight=vendor" parameter added into grub, the
result is the brightness level indicator would only change between max
and max-1, however, the brightness itself does not.

With "acpi_osi='!Windows 2012'" added, the brightness keys are not
working at all.

ubuntu@201408-15450:~$ sudo showkey -k
[sudo] password for ubuntu: 
kb mode was ?UNKNOWN?
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]

press any key (program terminates 10s after last keypress)...
keycode  28 release
keycode 224 press
keycode 224 release
keycode 224 press
keycode 224 release
keycode 225 press
keycode 225 release
keycode 225 press
keycode 225 release
^Ccaught signal 2, cleaning up...
ubuntu@201408-15450:~$ sudo showkey -s
kb mode was ?UNKNOWN?
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]

press any key (program terminates 10s after last keypress)...
0x9c 
0xe0 0x4c 0xe0 0xcc 0xe0 0x4c 0xe0 0xcc 
0xe0 0x54 0xe0 0xd4 0xe0 0x54 0xe0 0xd4

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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:
  New
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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