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T440p keyboard backlight issue

T430 and later, plus T530 and later series specific matters only
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Kuzman
Posts: 2
Joined: Wed Aug 02, 2017 2:47 pm
Location: Paris, France

T440p keyboard backlight issue

#1 Post by Kuzman » Wed Aug 02, 2017 2:49 pm

I have a T440p which came with a non backlit keyboard, which I wanted to replace it with a backlit one. After installing the new keyboard the backlight wouldn't come on (i'm using Fn + spacebar, the keyboard has the light icon on the spacebar and the OS shows an icon for the backlight). I tried swapping it out with a friend's keyboard (from a t450s which was replaced due to a damaged key) but without any luck.

Could this be an issue with the motherboard or controller? What are my options?

Thanks!

Thinkpad4by3
ThinkPadder
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Posts: 1801
Joined: Sun Aug 09, 2015 9:25 am
Location: N. Bellmore, ny

Re: T440p keyboard backlight issue

#2 Post by Thinkpad4by3 » Wed Aug 02, 2017 2:55 pm

My prediction is that its just a regedit fix. Probably is similar on how an regedit fix is needed to enable physical buttons when swapping X250 touchpad in X240.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

Kuzman
Posts: 2
Joined: Wed Aug 02, 2017 2:47 pm
Location: Paris, France

Re: T440p keyboard backlight issue

#3 Post by Kuzman » Wed Aug 02, 2017 3:47 pm

Could you, please, point me in the right direction?

It doesn't work with either linux nor WIN10 (a clean install). This page https://support.lenovo.com/fr/en/solutions/ht104656 also states that it's a hardware feature. It doesn't even light up when in BIOS.
I would love to find a software fix for this, but it seems less and less plausible at this point.

WVZR1
Freshman Member
Posts: 114
Joined: Sat Oct 08, 2005 7:34 pm
Location: Charles Town, WV

Re: T440p keyboard backlight issue

#4 Post by WVZR1 » Mon Aug 07, 2017 7:14 am

Kuzman wrote:
Wed Aug 02, 2017 2:49 pm
I have a T440p which came with a non backlit keyboard, which I wanted to replace it with a backlit one. After installing the new keyboard the backlight wouldn't come on (i'm using Fn + spacebar, the keyboard has the light icon on the spacebar and the OS shows an icon for the backlight). I tried swapping it out with a friend's keyboard (from a t450s which was replaced due to a damaged key) but without any luck.

Could this be an issue with the motherboard or controller? What are my options?

Thanks!
My T440 NOT A P is this > "Ctrl" + Spacebar, First function is on, another is BRIGHTER and another is OFF.
T60 2007-GCU T7200 2.0GHZ/2.0G 3945ABG XP (Bluetooth & ATI FireGL V5250 by "Brad")

600 2645-A2U used only for "data logging" my 1990 Corvette ZR-1

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