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

Verified on 14.04.3 stock image on 201308-14057, brightness works as expected.
With flgrx 2:15.200-0ubuntu0.5 installed, the brightness control still works as expected.

For those who are affected by this, please give 14.04.3 a try.
I will mark this bug as Fix-released, thanks.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/1249302

Title:
  AMD Radeon HD 8210[1002:9834] Brightness cannnot be adjusted without
  fglrx driver

Status in linux package in Ubuntu:
  Fix Released

Bug description:
  CID: 201308-14057 Dell Inspiron 3135

  Brightness cannot be adjusted if the proprietary fglrx video driver is not installed.
  Module "radeon" cannot be found in lsmod, it seems that this graphic chip is not supported

  Steps:
  1. Install 12.04.3, and boot to desktop.
  2. Try to adjust screen brightness with hotkey
  3. Try to adjust screen brightness in "Brightness and Lock"

  Expected results:
  1. Brightness could be adjusted by the hokey
  2. Brightness could be adjusted in "Brightness and Lock"

  Actual Results:
  1. Hotkey event was correctly captured, brightness indicator level will change accordingly, but the brightness won't be altered.
  2. Brightness cannot be adjusted in "Brightness and Lock" as well

  Update to 3.8.0-33 still not helping with this.

  However, acpi_backlight=vendor in grub can make it work.
  So as the proprietary fglrx driver.

  Debugging information:
  $ /usr/lib/nux/unity_support_test -c -p
  OpenGL vendor string:   VMware, Inc.
  OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.2, 128 bits)
  OpenGL version string:  2.1 Mesa 9.1.7

  Not software rendered:    no
  Not blacklisted:          yes
  GLX fbconfig:             yes
  GLX texture from pixmap:  yes
  GL npot or rect textures: yes

  Compiz supported:         no

  $ /usr/share/checkbox/scripts/graphics_driver
  ------------- VIDEO DRIVER INFORMATION -------------
  ERROR: No video driver loaded! Possibly in failsafe mode!
  ------------- HYBRID GRAPHICS CHECK ----------------
  Graphics Chipset: AMD (1002:9834)
  Loaded DDX Drivers: ati, radeon, vesa, modesetting, fbdev
  Hybrid Graphics: no

  $ cat /proc/version
  Linux version 3.8.0-33-generic (buildd@toyol) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #48~precise1-Ubuntu SMP Thu Oct 24 16:28:06 UTC 2013

  $ dmesg | grep 'ACPI: Video'
  [    9.979714] ACPI: Video Device [VGA] (multi-head: yes  rom: no  post: no)

  $ ls /sys/class/backlight
  dell_backlight

  === After the "acpi_backlight=vendor" was added into grub===
  $ ls /sys/class/backlight
  dell_backlight

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.8.0-33-generic 3.8.0-33.48~precise1
  ProcVersionSignature: Ubuntu 3.8.0-33.48~precise1-generic 3.8.13.11
  Uname: Linux 3.8.0-33-generic x86_64
  NonfreeKernelModules: wl
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.8.0-33-generic.
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 1: Generic_1 [HD-Audio Generic], device 0: ALC283 Analog [ALC283 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1735 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1735 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Generic'/'HD-Audio Generic at 0x90240000 irq 81'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100500'
     Controls      : 7
     Simple ctrls  : 1
  Card0.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Card1.Amixer.info:
   Card hw:1 'Generic_1'/'HD-Audio Generic at 0x90244000 irq 82'
     Mixer name	: 'Realtek ALC283'
     Components	: 'HDA:10ec0283,10280614,00100003'
     Controls      : 16
     Simple ctrls  : 7
  CurrentDmesg: [   18.795370] init: anacron main process (1061) killed by TERM signal
  Date: Fri Nov  8 05:43:59 2013
  HibernationDevice: RESUME=UUID=ac9c1dd5-27db-4d5d-be59-744320e42db0
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  MachineType: Dell Inc. Inspiron 3135
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-33-generic root=UUID=8ec40ec2-ac0a-457e-9879-4dce08e1c15f ro quiet splash acpi_backlight=vendor vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-33-generic N/A
   linux-backports-modules-3.8.0-33-generic  N/A
   linux-firmware                            1.79.7
  SourcePackage: linux-lts-raring
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/13/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: X11
  dmi.board.name: BNE3A1
  dmi.board.vendor: Dell Inc.
  dmi.board.version: X02
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: X11
  dmi.modalias: dmi:bvnDellInc.:bvrX11:bd08/13/2013:svnDellInc.:pnInspiron3135:pvr:rvnDellInc.:rnBNE3A1:rvrX02:cvnDellInc.:ct8:cvrX11:
  dmi.product.name: Inspiron 3135
  dmi.sys.vendor: Dell Inc.

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