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https://bugs.launchpad.net/bugs/1208257

Title:
  [HP ProBook 4540s] brightness control problems

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I bought a laptop in December 2012, immediately tried to put Ubuntu
  12.10, got broken wi-fi and non-working graphics acceleration. Updated
  kernel to version 3.6, with graphic acceleration was all right, even
  partially earned wi-fi. After some time wi-fi hang, helped only
  restart the network subsystem.

  Updated kernel to 3.7, with the wi-fi was all became normal, but
  stopped working brightness control with the Fn keys. Progress bar
  indicates that the brightness changes, but in fact nothing happens.

  Tried the new distribution 13.04, on 3.8 kernels, 3.9, 3.10, nothing
  changes. Upon adjustment has broken in 3.7 kernel. It turns out that
  this is a regression.

  Hardware Configuration:
  Intel Core I5 3210M
  Intel HD 4000
  8 gigs of ram
  Ralink corp. RT3290
  Ubuntu 13.04 x64
  --- 
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA:
   country UA:
   	(2402 - 2482 @ 40), (N/A, 20)
  DistroRelease: Ubuntu 13.04
  InstallationDate: Installed on 2013-08-04 (0 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Hewlett-Packard HP ProBook 4540s
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic root=UUID=f5b4658c-870e-449d-a9d7-5caaa6eec2f3 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-19-generic N/A
   linux-backports-modules-3.8.0-19-generic  N/A
   linux-firmware                            1.106
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  raring
  Uname: Linux 3.8.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 05/20/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68IRR Ver. F.41
  dmi.board.name: 17F6
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 58.1E
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68IRRVer.F.41:bd05/20/2013:svnHewlett-Packard:pnHPProBook4540s:pvrA1018C1100:rvnHewlett-Packard:rn17F6:rvrKBCVersion58.1E:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 4540s
  dmi.product.version: A1018C1100
  dmi.sys.vendor: Hewlett-Packard
  --- 
  ApportVersion: 2.12-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     3887 F.... pulseaudio
                        ubuntu    14062 F.... pulseaudio
  CRDA:
   country UA:
   	(2400 - 2483 @ 40), (N/A, 20), NO-OUTDOOR
   	(5150 - 5350 @ 40), (N/A, 20), NO-OUTDOOR
   	(57240 - 65880 @ 2160), (N/A, 40), NO-OUTDOOR
  CasperVersion: 1.336
  DistroRelease: Ubuntu 13.10
  LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130807)
  MachineType: Hewlett-Packard HP ProBook 4540s
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true file=/cdrom/preseed/username.seed boot=casper persistent initrd=/casper/initrd.lz splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.10.0-6.17-generic 3.10.3
  RelatedPackageVersions:
   linux-restricted-modules-3.10.0-6-generic N/A
   linux-backports-modules-3.10.0-6-generic  N/A
   linux-firmware                            1.113
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  saucy
  Uname: Linux 3.10.0-6-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 05/20/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68IRR Ver. F.41
  dmi.board.name: 17F6
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 58.1E
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68IRRVer.F.41:bd05/20/2013:svnHewlett-Packard:pnHPProBook4540s:pvrA1018C1100:rvnHewlett-Packard:rn17F6:rvrKBCVersion58.1E:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 4540s
  dmi.product.version: A1018C1100
  dmi.sys.vendor: Hewlett-Packard

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