kernel-packages team mailing list archive

[Lonnie Lee Best <1295141@xxxxxxxxxxxxxxxxxx>]

Aaron Lu asked for these things:

Please list what backlight control interfaces do you have:
# ls /sys/class/backlight
acpi_video0  intel_backlight

And test if manually echo a value works:
# cd /sys/class/backlight/i915_xxx
# cat max_brightness

user@Qosmio-X75-A:~$ cd /sys/class/backlight/i915_xxx
bash: cd: /sys/class/backlight/i915_xxx: No such file or directory
user@Qosmio-X75-A:~$ cd /sys
user@Qosmio-X75-A:/sys$ ls
block  class  devices   fs          kernel  power
bus    dev    firmware  hypervisor  module
user@Qosmio-X75-A:/sys$ cd class/backlight/
user@Qosmio-X75-A:/sys/class/backlight$ ls
acpi_video0  intel_backlight
user@Qosmio-X75-A:/sys/class/backlight$ cd intel_backlight
user@Qosmio-X75-A:/sys/class/backlight/intel_backlight$ ls
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power           device      power           type
user@Qosmio-X75-A:/sys/class/backlight/intel_backlight$ cat max_brightness 
5273
user@Qosmio-X75-A:/sys/class/backlight/intel_backlight$ cd ..
user@Qosmio-X75-A:/sys/class/backlight$ ls
acpi_video0  intel_backlight
user@Qosmio-X75-A:/sys/class/backlight$ cd acpi_video0
user@Qosmio-X75-A:/sys/class/backlight/acpi_video0$ ls
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power           device      power           type
user@Qosmio-X75-A:/sys/class/backlight/acpi_video0$ cat max_brightness 
100
user@Qosmio-X75-A:/sys/class/backlight/acpi_video0$ echo 400 > brightness 
bash: brightness: Permission denied
user@Qosmio-X75-A:/sys/class/backlight/acpi_video0$ sudo echo 400 > brightness 
bash: brightness: Permission denied
user@Qosmio-X75-A:/sys/class/backlight/acpi_video0$ cd ..
user@Qosmio-X75-A:/sys/class/backlight$ ls
acpi_video0  intel_backlight
user@Qosmio-X75-A:/sys/class/backlight$ cd intel_backlight
user@Qosmio-X75-A:/sys/class/backlight/intel_backlight$ ls
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power           device      power           type
user@Qosmio-X75-A:/sys/class/backlight/intel_backlight$ cat brightness 
5100
user@Qosmio-X75-A:/sys/class/backlight/intel_backlight$ sudo echo 400 > brightness 
bash: brightness: Permission denied
user@Qosmio-X75-A:/sys/class/backlight/intel_backlight$ sudo echo 600 > brightness 
bash: brightness: Permission denied

(see attachment of acpidump.txt)

** Attachment added: "acpidump.txt"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1295141/+attachment/4094303/+files/acpidump.txt

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https://bugs.launchpad.net/bugs/1295141

Title:
  Toshiba Qosmio X75-A7298 - Can't Adjust Brightness

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

Bug description:
  The Toshiba Qosmio X75-A7298 is running Ubuntu 14.04 blazingly fast.

  The only issue I've noticed, is that the OS doesn't seem to have a
  proper mapping to this laptop's function keys.

  Specifically, I'm unable to adjust the screen's brightness. Looking a
  the keyboard layout, I should be able to dim the screen by holding
  down the FN key and then press F2. Alternatively, to make the screen
  brighter you'd key  FN-F3.

  This is a fantasic laptop, I'd like to help (if I can) to get it fully
  functional for Ubuntu 14.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-18-generic 3.13.0-18.38 [modified: boot/vmlinuz-3.13.0-18-generic]
  ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
  Uname: Linux 3.13.0-18-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  steve      2503 F.... pulseaudio
   /dev/snd/controlC0:  steve      2503 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Thu Mar 20 08:43:44 2014
  HibernationDevice: RESUME=UUID=c040a1e4-2261-47d3-85df-a01363cf3fca
  InstallationDate: Installed on 2014-03-19 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140319)
  MachineType: TOSHIBA Qosmio X75-A
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-18-generic root=UUID=82c4632b-cc2b-48f4-b42f-61690dbc80b7 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-18-generic N/A
   linux-backports-modules-3.13.0-18-generic  N/A
   linux-firmware                             1.126
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/18/2013
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: 1.30
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Type2 - Board Product Name1
  dmi.board.vendor: Type2 - Board Vendor Name1
  dmi.board.version: Type2 - 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:bvnInsydeCorp.:bvr1.30:bd09/18/2013:svnTOSHIBA:pnQosmioX75-A:pvrPSPLTU-017016:rvnType2-BoardVendorName1:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: Qosmio X75-A
  dmi.product.version: PSPLTU-017016
  dmi.sys.vendor: TOSHIBA

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