Cannot adjust the brightness in Windows 10 1803

Anonymous

I have a Dell L501X laptop with an i5-460m processor with Intel HD graphics first gen (driver 8.15.10.2900). After upgrading to Windows 10 vers. 1803 I've noticed that the brightness control is not working. Because of this, I had to waste MY TIME and downgrade to ver 1709. Now I have to disable the windows update service in order to prevent the "feature upgrade".

I contacted your support technicians and they told me that the brightness feature was removed in ver 1803. They always seem to be unprepared and they try simple tests that waste customer's time; in the end, I had to give up and downgrade to 1709... What's the point of having this mess MS???

Note: I tied to downgrade to Intel HD driver 2253 but it didn't help.

Also, I tried to adjust the brightness from the Windows settings!!! I had been doing that for the last 2.5 years in Windows 10. Please share this message with the MS dev team so they can fix this bug in the upcoming KBs... of 1803!

DO NOT mark this post as SOLVED until a clear solution is posted!

Update: I discovered that if you disable the sensor service in services.msc the issue can be reproduced in v1709... It seems that MS has a bug with the sensor service in v 1803... hope this will help the MS dev team to fix in the next updates! We are MAKING PROGRESS!!!

UPDATE 2: changing the testfeaturecontrol to f810 from f800 in v1803 does not solve the issue. No progress, unfortunately!

UPDATE 3: Microsoft just released a KB4284835 for v1803 that addresses the brightness issues on certain laptops ... can someone confirm if the issue is resolved? The latest KB fixed the brightness issue!!! Thank you, Microsoft!

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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Anonymous

Finally I have found a very clear situation, that explains all symptoms and why anyone has a solution that may work and may not!

First: Dell LX501X has two video adapters, primary Intel, secondary Nvidia GT 420M.

For Nvidia, DO NOT use WindowsUpdate Driver, because it corrupts Registry; use last driver available at Nvidia Site.

BUT this has no relevance for brightness problem, that is related to the Intel Video Adapter only!

Do not search for other versions of video Driver! Someone referred to version 2239 or other previous to 2900.

The problem is not driver version: it is OK the WindowsUpdate 8.15.10.2900; the problem is not the "FeatureTestControl" value: F800 found in 1709, remains unchanged in 1803 and is ok, no need to change it!

The problem is Windows kernel, and I explain why.

We all agree that in 1709 all works fine.

In 1803 brightness does not work, BUT, if I REINSTALL the SAME video driver ALREADY INSTALLED (forcing installation, even if the same version: it is possible, selecting "have a disk"), after this action, brightness WORKS FINE.

BUT, it works ONLY until NEXT BOOT: after next boot, the problem is present again.

So, in conclusion, to have brigthness working, I have to REINSTALL video driver AFTER EACH Pc power on!

Everyone, I think, must agree that this behaviour is a Windows Kernel Problem (in the area of variuos modules hierarchy linkage)!

It is a BUG that MUST be corrected BY Microsoft!

BE AWARE that brigthness, when works, works ONLY by means of keyboard Keys: the various Windows sliders have no effect; the situation is VERY CRAZY: moving the sliders, brigthness does not change; using keyboard Keys, sliders move according to...!

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Anonymous

2018-06-09T14:37:57+00:00

Can you please try fb20 instead of f800 in featuretestcontrol and see if you have brightness control after restart? I agree the windows nvidia drivers from ms update are not working properly, I did some tests before. Also, intel video driver has some start-up files that might break the brightness.

The latest KB update solved my problem! The brightness feature is working as expected!

Thank you all for your help and suggestions!

I have a Dell L501x with i5-460m CPU!
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Anonymous

2018-06-16T17:59:57+00:00

Microsoft released a patch that should solve the brightness bug caused by update 1803 and several other issues:

Microsoft June 2018 Patch Tuesday - source: Windows Central, 12 June 2018

"For those on the latest Windows 10 release, the April 2018 Update, today's fixes are rolling out as KB4284835 (build 17134.112). And while this rollout addresses a number of bugs,

it also contains a crucial fix for an issue affecting brightness controls on some laptops.

This seems to have been most noticeable on HP EliteBooks, but you should see an improvement if you've experienced issues on other laptops as well."

(see also Microsoft June 2018 Patch Tuesday Fixes 50 Security Issues - BLEEPINGCOMPUTER )

With thanks to Carlo from Italy Carlodavoli1 for sharing this info!

Source: Display brightness at max after 1803 update topic
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