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chbchi
Paper Tape
Posts: 4
Registered: ‎11-23-2016
Location: US
Views: 2,059
Message 31 of 33

Re: P400 Touch screen brightness won't adjust

Here's the solution:

 

http://www.tomshardware.com/answers/id-1805806/intel-graphics-driver.html

 

Intel HD Graphics 4000 and Windows 10 & Windows 8.1 ( Brightness fix with latest driver)

Brightness Fix with Driver Date 8/17/2015 )

Brightness problem Solved

Intel HD Graphics 4000 with NVIDIA® GeForce® GT650M graphics.

Install:

Intel HD Graphics 4000 Driver, Driver Date: 8/17/2015


Driver Version: 10.18.10.4276

 

Make sure you backup your registry first before proceeding!!!!

 

open regedit in Run Command

 

Registry has wrong value:

 

Currently reads as :

 

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000] "FeatureTestControl"=

 

"Edit DWORD 32 bit"= f000

 

Registry with New Value:

 

You needed to change the value in registry to: ( f008 )

 

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000] "FeatureTestControl"=

 

"Edit DWORD 32 bit"= f008

 

Then Restart Computer

 

LynnInOntario
What's DOS?
Posts: 1
Registered: ‎08-19-2017
Location: CA
Views: 1,254
Message 32 of 33

Re: P400 Touch screen brightness won't adjust

Thank you for this post. Today I accidentally reduced my P400's screen brightness. Yours was the easiest and quickest method to make it bright again.

I agree with another's mention in this topic about this being a long-outstanding issue (it's happened to me before), so why isn't there a fix for it by now?

Thanks a bunch.

chibcharus
What's DOS?
Posts: 2
Registered: ‎03-03-2016
Location: Montgomery Village, MD
Views: 1,044
Message 33 of 33

Re: P400 Touch screen brightness won't adjust

Worked like a charm, I was already looking at videos on how to replace the backlight. Thank you.

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