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What is the purpose of the light in the top bezel of the ThinkPad T400?

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Paragraphogram
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What is the purpose of the light in the top bezel of the ThinkPad T400?

#1 Post by Paragraphogram » Wed Jun 13, 2018 2:52 am

I want to know what the purpose of the light in the top bezel is. My theories so far are that it's an early form of keyboard backlight for the dark or it's a light for reading papers in the dark... The light isn't very bright though...

dr_st
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Re: What is the purpose of the light in the top bezel of the ThinkPad T400?

#2 Post by dr_st » Wed Jun 13, 2018 3:55 am

Welcome to the nineties. :)

http://www.thinkwiki.org/wiki/ThinkLight

And welcome to the forum too! :D
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Paragraphogram
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Re: What is the purpose of the light in the top bezel of the ThinkPad T400?

#3 Post by Paragraphogram » Wed Jun 13, 2018 4:43 am

Huh, interesting, thanks for the info :D

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Re: What is the purpose of the light in the top bezel of the ThinkPad T400?

#4 Post by w0qj » Thu Jun 14, 2018 1:43 am

We actually prefer the ThinkLight !

ThinkLight can illuminate a piece of paper that is beside your computer,
allowing you to work in otherwise compete darkness.
Actually tried to do office work in such situations, and it works!

The illuminated keys cannot do this.
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TonyJZX
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Re: What is the purpose of the light in the top bezel of the ThinkPad T400?

#5 Post by TonyJZX » Thu Jun 14, 2018 3:41 am

To be fair, sometimes the light is so dim it barely lights up the kbd.

But otherwise its darn useful... eg. i use it to see small objects in a conferenece room etc.

I'm pretty sure Lenovo is determined to erase this on future models.

As far as I know, only the HP Elite tried to replicate the light on only their 1st gen models coming onto 10yrs ago and they used a physical switch so it looks like the pop up headlights on a 1980s sports car.

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Re: What is the purpose of the light in the top bezel of the ThinkPad T400?

#6 Post by jdrou » Thu Jun 14, 2018 2:47 pm

TonyJZX wrote:
Thu Jun 14, 2018 3:41 am
To be fair, sometimes the light is so dim it barely lights up the kbd.
It was sort of ahead of its time; we've got brighter LEDs available now.

I've been saying for years that pretty much anything that has a battery should have an LED light of some sort, given the battery is generally the largest & heaviest part of most lights.
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Re: What is the purpose of the light in the top bezel of the ThinkPad T400?

#7 Post by TPFanatic » Thu Jun 14, 2018 9:36 pm

Thinkpad X200 and newer Thinkpads had a revised Thinklight outlet shape that improves the breadth of the light.
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Art
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Re: What is the purpose of the light in the top bezel of the ThinkPad T400?

#8 Post by Art » Thu Jul 12, 2018 9:00 am

# echo 255 > /sys/class/leds/tpacpi\:\:thinklight/brightness

# echo 0 > /sys/class/leds/tpacpi\:\:thinklight/brightness
It appears to support 256 brightness levels, where 255 isn’t bright enough. How cute :D

kiterunner
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Re: What is the purpose of the light in the top bezel of the ThinkPad T400?

#9 Post by kiterunner » Mon Aug 13, 2018 12:30 am

w0qj wrote:
Thu Jun 14, 2018 1:43 am
We actually prefer the ThinkLight !

ThinkLight can illuminate a piece of paper that is beside your computer,
allowing you to work in otherwise compete darkness.
Actually tried to do office work in such situations, and it works!

The illuminated keys cannot do this.
Vote for THIS :)

MikalE
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Re: What is the purpose of the light in the top bezel of the ThinkPad T400?

#10 Post by MikalE » Mon Aug 13, 2018 6:31 am

It's actually an IR/visible light emitter so they can track you from orbit.
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