impossible changing the brightness

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gaaln
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Joined: Tue Feb 19, 2008 2:39 pm
Location: Lisbon, Portugal

impossible changing the brightness

#1 Post by gaaln » Thu Feb 21, 2008 3:29 am

Hi!
Since i purchased the laptop (a second hand thinkpad T40) the brightness of the backlight is stucked. When I change it via the function key, i have the scrollbar on the screen but no effect on the brightness..
Any help ?
Thanks!
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gaaln
Posts: 4
Joined: Tue Feb 19, 2008 2:39 pm
Location: Lisbon, Portugal

#2 Post by gaaln » Thu Feb 21, 2008 1:52 pm

I will reformulate my question....
I cannot access the tuning of the brightness via the function keys on the keyboard.
Is there any other access (hardware, software) ?
Should I dismantle all the laptop ?
Thanks
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ajkula66
SuperUserGeorge
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#3 Post by ajkula66 » Thu Feb 21, 2008 8:28 pm

Welcome to the forum!

Are you able to change display brightness in BIOS?

If yes, you have to download display drivers and hotkey drivers from Lenovo's website.

Good luck and let us know.
...Knowledge is a deadly friend when no one sets the rules...(King Crimson)

Cheers,

George (your grouchy retired FlexView farmer)

AARP club members:A31p, T43pSF

Abused daily: T61p

PMs requesting personal tech support will be ignored.
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gaaln
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Joined: Tue Feb 19, 2008 2:39 pm
Location: Lisbon, Portugal

#4 Post by gaaln » Fri Feb 22, 2008 5:57 am

I have only 2 options for brightness in BIOS: normal/high
Both give the same behavior, the brightness stay locked.
I downloaded the drivers form lenovo's anyway and it does not help....
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ajkula66
SuperUserGeorge
SuperUserGeorge
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#5 Post by ajkula66 » Fri Feb 22, 2008 8:55 am

Is there any difference that you can see when you set it to "high" as opposed to "normal"?
...Knowledge is a deadly friend when no one sets the rules...(King Crimson)

Cheers,

George (your grouchy retired FlexView farmer)

AARP club members:A31p, T43pSF

Abused daily: T61p

PMs requesting personal tech support will be ignored.
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gaaln
Posts: 4
Joined: Tue Feb 19, 2008 2:39 pm
Location: Lisbon, Portugal

#6 Post by gaaln » Fri Feb 22, 2008 2:43 pm

no difference : (
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Tomplee
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Joined: Tue Jan 01, 2008 12:24 pm
Location: Prague, Czech rep.

#7 Post by Tomplee » Sun Feb 24, 2008 7:06 am

Hi, I have similar problem on X61s. I can change the brightness by Fn+Home/End keys only until first sleep. After wake-up I cannot change the brightness even by changing power plan.
Does anyone know which processes participate in changing brightness? Maybe one of them hangs.
X61s L7500 1.6GHz 3GB 2007 W8.1 32bit,
L540 i5-4300M 2.6GHz 4GB 2014 W8.1 64bit
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ulrich.von.lich
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#8 Post by ulrich.von.lich » Sun Feb 24, 2008 1:09 pm

I have a T43 connecting to an external monitor. I can use the function keys to adjust the brightness on the ThinkPad monitor but not on the external monitor. (The bar changes but no effect on the brightness. I have to use the buttons on the external LCD to change the brightness)

So my guess is some communication problem between the motherboard and the LCD? Such a bad inverter or a connection cable?

I do wish I could help you guys more..
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