[Bug 1169386] Re: [keymap] Toshiba satellite A660: backlight key does not work

[Joseph J. Pollock]

I have a Toshiba Satellite P755 S5182. It works/fails almost identically
to the posters above (on kubuntu 12.04). One of the major reasons I
selected this notebook was for the backlit keyboard (which works fine on
Windows 7 - which I use only when forced to, but not on Linux.)

The main differences I see are 1) no files with illumination" in their
names, 2) Fn+Z does not display anything, but the key does have a
backlight icon on it.

The toshiba_acpi module is loaded, but lsmod says it's used by none. The
source code for it on my machine appears to be very old (2010) 386 code
and a cursory scan of it did not show me anything that looked like it
had to do with the keyboard backlight, but I'm not much of a C coder
these days and I could easily have missed something.

If there is any code to test to diagnose or fix this problem, I'd be
happy to help. I really need this feature.

I'm not ready to upgrade to a new distro release any time soon, but I
have spare partitions where I can install another (newer) distro for
testing purposes.

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https://bugs.launchpad.net/bugs/1169386

Title:
  [keymap] Toshiba satellite A660: backlight key does not work

Status in “systemd” package in Ubuntu:
  Incomplete

Bug description:
  Toshiba satellite A660 backlight just never worked on ubuntu.

  Here is an outline of some of the LEDS in a toshiba

  http://i.imgur.com/l54s5CP.jpg

  When i press Fn+Z the ubuntu keyboard LED notification shows up,
  however nothing changes.

  so i navigated to

  /sys/devices/pci0000:00/0000:00:1c.4/0000:16:00.0/firmware_node/subsystem/devices/TOS1900:00/leds/toshiba::illumination/device/leds/toshiba::illumination

  found files

  brightness device max_brightness power subsystem trigger uevent

  when i changed the value in brightness from 0 to 1

  LED 1, 2, and 3 in the above picture turns on, and led 1 turns off
  when touch bad is off.

  However there is no keyboard backlight.upon boot the backboard
  backlight works while posting and shutdown when grub loads. When i
  disable acpi the keyboard backlight works however ill lose other
  functionalities like brightness.

  Any way to fix it?

  There is also another directory.

  /sys/devices/pci0000:00/0000:00:1c.4/0000:16:00.0/firmware_node/subsystem/devices/TOS1900:00/leds/toshiba::illumination/device/leds/toshiba::illumination/subsystem/mmc0::

  with files brightness device max_brightness power subsystem trigger uevent
  nothing happens when brightness value changes.


  LSB Version:	core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
  Distributor ID:	Ubuntu
  Description:	Ubuntu Raring Ringtail (development branch)
  Release:	13.04
  Codename:	raring
  Linux mouhanad-Satellite-A660 3.8.0-18-generic #28-Ubuntu SMP Thu Apr 11 19:38:55 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

  #Problem also exists in older version of ubuntu, new kernel in 13.04
  does not solve the problems.

   xev shows a key being pressed and being mapped to kbdbacklight. A a
  notification that keyboard is being turned on appears when Fn+Z is
  pressed. Also unlike other manufactures toshiba doesn't have
  brightness on backlit keyboards, its either on or off or a timer.

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