The Illuminated lights on my keyboard no longer work

I just noticed last night that my Mac Book Pro's Illuminated keyboard lights no longer work. They used to work without any problems but now they don't. I don't use this feature often, so I don't know how long the problem has been occuring. I only just noticed it last night.
I tried resetting the PRAM and the power management, to no avail. The "Illuminate keyboard in low-light settings" button is checked in system preferences.
The strange thing is, I can press the keyboard light controllers on the keyboard and the indicator of the light level appears on the screen, but the lights don't actually come on.
The ambient light settings for the display are working fine. I don't understand what's going on with the keyboard lights. It's very irritant.
My Macbook Pro is one of June 2007's models, the Santa Rosa 15", 2.4 GHz Intel Core 2 Duo. It came with Tiger and I upgraded to Leopard in December. Last week I upgraded to 10.5.3. Thanks in advance for any help!

Yes, as I said in my first post, that box is toggled. It still doesn't work. I've tried turning it off and back on and it still doesn't work.
I haven't even had this computer for a year yet already it's breaking down. 3 months after I bought I had to have the LED replaced because it was defective, and now this.
Why is this professional laptop that costs as much as it does breaking down after barely a year? I never had these problems with my IBM ThinkPad laptop. I only needed to take it in for support after 4 years of solid performance.
I don't expect to see these problems in a supposedly professional computer that is barely a year old.
Oh well.
Message was edited by: orbit82
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Output of locale-ctl status:
System locale: LANG=fr_CA.UTF-8;
VC Keymap: us-acentos;
X11 Layout: n/a.
Output of pacman.log:
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[2014-09-24 17:03] [PACMAN] installed ca-certificates-utils (20140325-2)
[2014-09-24 17:03] [PACMAN] installed ca-certificates-mozilla (3.17-3)
[2014-09-24 17:03] [PACMAN] installed ca-certificates-cacert (20140824-1)
[2014-09-24 17:03] [PACMAN] upgraded ca-certificates (20140325-1 -> 20140325-2)
[2014-09-24 17:03] [PACMAN] upgraded efivar (0.10.8.g81d0146-1 -> 0.11-1)
[2014-09-24 17:03] [PACMAN] upgraded efibootmgr (0.7.0.16.g099e110-1 -> 0.8.0-1)
[2014-09-24 17:03] [PACMAN] upgraded rtmpdump (20131205-1 -> 20140918-2)
[2014-09-24 17:03] [PACMAN] upgraded libx264 (1:142.20140826-1 -> 1:142.20140826-2)
[2014-09-24 17:03] [PACMAN] upgraded ffmpeg (1:2.3.3-2 -> 1:2.4.1-1)
[2014-09-24 17:03] [PACMAN] upgraded nspr (4.10.6-1 -> 4.10.7-1)
[2014-09-24 17:03] [PACMAN] upgraded nss (3.16.3-1 -> 3.17-3)
[2014-09-24 17:03] [PACMAN] upgraded firefox (32.0.1-1 -> 32.0.2-1)
[2014-09-24 17:03] [PACMAN] upgraded firefox-i18n-fr (32.0.1-1 -> 32.0.2-1)
[2014-09-24 17:03] [PACMAN] upgraded gegl (0.2.0-11 -> 0.2.0-12)
[2014-09-24 17:03] [PACMAN] upgraded gstreamer (1.4.1-1 -> 1.4.2-1)
[2014-09-24 17:03] [PACMAN] upgraded gst-plugins-base-libs (1.4.1-1 -> 1.4.2-1)
[2014-09-24 17:03] [PACMAN] upgraded gst-plugins-base (1.4.1-1 -> 1.4.2-1)
[2014-09-24 17:03] [PACMAN] upgraded k3b (2.0.2-9 -> 2.0.2-10)
[2014-09-24 17:03] [PACMAN] upgraded libgpg-error (1.14-1 -> 1.16-1)
[2014-09-24 17:03] [PACMAN] upgraded libtirpc (0.2.4-1 -> 0.2.5-1)
[2014-09-24 17:03] [PACMAN] upgraded xine-lib (1.2.6-1 -> 1.2.6-2)
[2014-09-24 17:03] [PACMAN] upgraded opencv (2.4.9-4 -> 2.4.9-5)
[2014-09-24 17:03] [PACMAN] upgraded openresolv (3.5.7-1 -> 3.5.7-2)
[2014-09-24 17:03] [PACMAN] upgraded openscenegraph (3.2.1-1 -> 3.2.1-2)
[2014-09-24 17:03] [PACMAN] upgraded perl (5.20.0-5 -> 5.20.1-1)
[2014-09-24 17:03] [PACMAN] upgraded python2 (2.7.8-1 -> 2.7.8-2)
[2014-09-24 17:03] [PACMAN] upgraded x264 (1:142.20140826-1 -> 1:142.20140826-2)
[2014-09-24 17:03] [PACMAN] upgraded xorg-server-common (1.16.0-6 -> 1.16.1-1)
[2014-09-24 17:03] [PACMAN] upgraded xorg-server (1.16.0-6 -> 1.16.1-1)
[2014-09-24 17:03] [PACMAN] upgraded xz (5.0.6-1 -> 5.0.7-1)

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1) I could restore the keyboard in X with this command:
$ localectl set-x11-keymap us pc104 alt-intl
which creates /etc/X11/xorg.conf.d/00-keyboard.conf:
Section "InputClass"
Identifier "system-keyboard"
MatchIsKeyboard "on"
Option "XkbLayout" "us"
Option "XkbModel" "pc105"
Option "XkbVariant" "intl"
Option "XkbOptions" "terminate:ctrl_alt_bksp"
EndSection
another option that worked was to rename /etc/X11/xorg.conf.d/10-evdev.conf.pacsave to /etc/X11/xorg.conf.d/10-evdev.conf, which also contained the "XkbLayout" and "XkbVariant" lines under "InputClass" (the original file had been renamed to .pacsave in February 2013). See wiki:
https://wiki.archlinux.org/index.php/Ke … on_in_Xorg
The output from localectl status now reads:
System Locale: LANG=fr_CA.UTF-8
VC Keymap: us-acentos
X11 Layout: us
X11 Model: pc105
X11 Variant: intl
X11 Options: terminate:ctrl_alt_bksp
So it seems that the result of an earlier upgrade was to "unset" the keyboard for X (compare with output from localectl status in original post). Why?
2) the keyboard in console (out of X) is still not working. If I try to set it to "us-alt-intl" in /etc/vconsole.conf, it works as "us" should (no dead keys); it I use "us-acentos" some keys do not work. locale-ctl shows that "us-acentos" does exist (but not "us-alt-intl").
Mystery.

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