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[Victoid <934095@xxxxxxxxxxxxxxxxxx>]

Hello all,

After going a bit grey, I found that /sys/class/backlight/toshiba breaks
after suspend, but /sys/class/backlight/intel_backlight continues to
function ('echo $number > backlight' after resume from suspend).  Some
great folks over at Arch have figured this one out.  I have a Toshiba
Portege R705, and this does the trick:

Source:
https://wiki.archlinux.org/index.php/Intel_Graphics#Backlight_not_fully_adjusting.2C_or_adjusting_at_all_after_resume.

Adapting this for Ubuntu 13.04:

1) sudo vi /etc/default/grub

2) change the line GRUB_CMDLINE_LINUX_DEFAULT as follows:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

3) sudo update-grub

4) Configure X11 to use the intel_backlight.  Create a file called
20-intel.conf here:

sudo vi /usr/share/X11/xorg.conf.d/20-intel.conf

5) Paste in the following:

Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"

EndSection

6) Reboot and bask in glorious brightness control.  Suspend/resume and
it continues to function normally from the Fn-F6/F7 keys.

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https://bugs.launchpad.net/bugs/934095

Title:
  Backlight control does not work correctly on Toshiba Satellite
  L750-17P.

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Fn+f6 & fn+f7 doesn't let me decrease/increase the
  backlight/brightness, only after putting the laptop to sleep and
  waking it up again does the backlight bar actually appear when I hit
  fn+f6 but it still doesn't decrease the backlight. The symptoms appear
  to be exactly the same as this other slightly older toshiba model
  posted here
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/850065

  UPDATE: Heres a way to turn down the backlight
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/934095/comments/34

  ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog] Subdevices: 1/1 Subdevice #0: subdevice #0
  AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: odin 1587 F.... pulseaudio /dev/snd/controlC0: odin 1587 F.... pulseaudio CRDA: Error: [Errno 2] Filen eller katalogen finns inte
  Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xc3400000 irq 50' Mixer name : 'Conexant CX20585' Components : 'HDA:14f15069,1179fc50,00100302' Controls : 13 Simple ctrls : 8
  Card1.Amixer.info: Card hw:1 'NVidia'/'HDA NVidia at 0xc3000000 irq 17' Mixer name : 'Nvidia GPU 14 HDMI/DP' Components : 'HDA:10de0014,10de0101,00100100' Controls : 16 Simple ctrls : 4
  DistroRelease: Ubuntu 11.10
  HibernationDevice: RESUME=UUID=2a275915-f56c-4620-a9fa-18c4d293dc71
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  MachineType: TOSHIBA SATELLITE L750
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcEnviron: PATH=(custom, no user) LANG=sv_SE.UTF-8 SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-16-generic-pae root=UUID=ca8610c9-3d1e-47af-bb6c-f72f5bee6316 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.0.0-16.28-generic-pae 3.0.17
  RelatedPackageVersions: linux-restricted-modules-3.0.0-16-generic-pae N/A linux-backports-modules-3.0.0-16-generic-pae N/A linux-firmware 1.60
  StagingDrivers: mei
  Tags: oneiric running-unity staging
  Uname: Linux 3.0.0-16-generic-pae i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 10/14/2011
  dmi.bios.vendor: INSYDE
  dmi.bios.version: 2.70
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Base Board Product Name
  dmi.board.vendor: Intel Corp.
  dmi.board.version: Base Board Version
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis Manufacturer
  dmi.chassis.version: OEM Chassis Version
  dmi.modalias: dmi:bvnINSYDE:bvr2.70:bd10/14/2011:svnTOSHIBA:pnSATELLITEL750:pvrPSK2YE-0FR01CN5:rvnIntelCorp.:rnBaseBoardProductName:rvrBaseBoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: SATELLITE L750
  dmi.product.version: PSK2YE-0FR01CN5
  dmi.sys.vendor: TOSHIBA

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