kernel-packages team mailing list archive

[Alan Pater <alan.pater@xxxxxxxxx>]

Done. Reported to the linux-acpi mailing list. Can be followed here:
http://marc.info/?t=141442299500005

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https://bugs.launchpad.net/bugs/1385453

Title:
  Toshiba R700 backlight control not always working

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

Bug description:
  When returning from sleep mode, I lose backlight control via Fn-F7.

  Restarting the system restores control.

  I am running Ubuntu 14.04 64 bit.
  ~$ uname -psrv
  Linux 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64

  I could also adjust the brightness from the terminal:

  ~$ cat /sys/class/backlight/intel_backlight/brightness
  1030

  ~$ grep . /sys/class/backlight/intel_backlight/*
  /sys/class/backlight/intel_backlight/actual_brightness:1030
  /sys/class/backlight/intel_backlight/bl_power:0
  /sys/class/backlight/intel_backlight/brightness:1030
  /sys/class/backlight/intel_backlight/max_brightness:4539

  So, to temporarily increase the screen brightness:

  ~$ echo 3030 | sudo tee /sys/class/backlight/intel_backlight/brightness
  3030

  But that does not give back control via Fn-F7, it just gives an
  independent way of adjusting the backlight.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-37-generic 3.13.0-37.64
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  asp        2789 F.... pulseaudio
  CRDA:
   country PE:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5735 - 5835 @ 40), (N/A, 30)
  CurrentDesktop: Unity
  Date: Fri Oct 24 13:56:26 2014
  HibernationDevice: RESUME=UUID=7d358de7-c06d-487c-959d-6d6f94292a9c
  InstallationDate: Installed on 2014-03-08 (229 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140304)
  MachineType: TOSHIBA PORTEGE R700
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic root=UUID=82477238-1cd0-4280-b615-9e54c4178914 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.127.7
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/22/2011
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 2.20
  dmi.board.asset.tag: 0000000000
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: dmi:bvnTOSHIBA:bvrVersion2.20:bd12/22/2011:svnTOSHIBA:pnPORTEGER700:pvrPT311Q-02S02U:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: PORTEGE R700
  dmi.product.version: PT311Q-02S02U
  dmi.sys.vendor: TOSHIBA

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