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[Peter Curtis <1218547@xxxxxxxxxxxxxxxxxx>]

I have the same problem on a Clevo W230ST based machine running  Saucy
13 10. Exactly the same symtoms and print out of ls /sys/class/backlight
both using 3.11 and a 3.8  kernel on a LiveUSB. The keys will reduce the
backlight but not increase leaving one completely in the dark. I am
running Bumblebee and there is also a problem with bbswitch (an
important part of bumblebee) not getting the correct ACPI handles but it
seems unrelated to me.

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https://bugs.launchpad.net/bugs/1218547

Title:
  Clevo W350ST brightness keys don't work on Kubuntu

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The Fn+F8 and Fn+F9 keys are not working on my Clevo W350ST with
  Kubuntu Raring to change screen brightness of the internal laptop
  screen. I installed linux-headers-3.11.0-4, linux-
  headers-3.11.0-4-generic,  linux-image-3.11.0-4-generic and linux-
  image-extra-3.11.0-4-generic  from Saucy packages repository but the
  problem persists.

  When trying:

  $ xev | sed -n 's/^.*state \([0-9].*\), keycode *\([0-9]\+\) *\(.*\), .*$/keycode \2 = \3, state = \1/p'                                                            
  keycode 36 = (keysym 0xff0d, Return), state = 0x10                                           
  keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x10                       
  keycode 233 = (keysym 0x1008ff02, XF86MonBrightnessUp), state = 0x10

  Event codes appear correctly.

  And changing:

  /sys/class/backlight/intel_backlight/brightness

  changes the brightness of the screen, but pressing the key combination
  does not. I believe this happens because the key combination is, in
  fact, changing the value of

  /sys/class/backlight/acpi_video0/brightness

  I have

  http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu
  http://ppa.launchpad.net/bumblebee/stable/ubuntu

  in my package sources

  Thanks!
  --- 
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  silvio     2689 F.... pulseaudio
   /dev/snd/pcmC1D0p:   silvio     2689 F...m pulseaudio
   /dev/snd/controlC0:  silvio     2689 F.... pulseaudio
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=58f7acf2-4914-4b11-a2ac-e641cb4b39fd
  InstallationDate: Installed on 2013-08-18 (57 days ago)
  InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Notebook W350STQ/W370ST
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-9-generic root=UUID=f0bca002-701a-49bb-befc-7343bac2e245 ro locale=pt_BR quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-9.16-generic 3.11.2
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-9-generic N/A
   linux-backports-modules-3.11.0-9-generic  N/A
   linux-firmware                            1.106
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  raring
  Uname: Linux 3.11.0-9-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lp lpadmin plugdev sambashare sudo vboxusers
  dmi.bios.date: 04/11/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W350STQ/W370ST
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/11/2013:svnNotebook:pnW350STQ/W370ST:pvrNotApplicable:rvnNotebook:rnW350STQ/W370ST:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: W350STQ/W370ST
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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