Cannot adjust the brightness in Windows 10 1803

What I say is only my experience, and when I say that the same brightness failure is present in Recovery Console of 1803, it seems to me obvious that is not a video driver problem, because in Recovery Console are present a number very limited and basic of drivers, not video driver, not Configuration App, and so on: I hope it is clear what I say...

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!!!

Hi there

I search too much about this problem and examine some older drivers for myself IBM X201 Core i5 Type 3626=GWG doesn't work.

Now I just use a funny solution for this awfully problem of new Microsoft Update:

Evert ti, I want to change my brightness level, I restart my OS and during the POST and loading the OS have time to change the brightness level with built-in keys (Fn+Home & Fn+End) to adjust the brightness.

Maybe its Funny, but the only way I found for bearing this big problem.

I delete the old versions so I can't rollback to that version, if had that version, without any hesitation rollback to previous version.

Microsoft must be bring update to solve the brightness problem with Update 1803 ASAP.

I also replied in below post and too many people have the same problem:

https://answers.microsoft.com/en-us/windows/forum/windows\_10-hardware/screen-brightness-stuck-at-max-after-updating-to/2c364180-cab4-4704-b07f-701a1bac89a5?auth=1

Best regards

Masmooei

Attention: what I said is wrong.

Now I made more tests and this is the result.

Versions 1709 and 1803 are IDENTICAL in behavior when any other video driver than Intel driver is operating (safe mode, recovery mode): brightnes remains at current level, UNLESS brigthness keyboard Keys are pressed: in this case brightness goes to its maximum value and changes no more.

This is true, in both levels, also for "Microsoft Generic video driver".

With Intel Driver (I consider only 8.15.10.2900 version, because previous versions show various bugs), brightness is changeable only in version 1709; in version 1803 the behavior is the same as Microsoft generic driver.

There is a little, but catastrophic, difference, in 1803, between "normal" boot mode, and "safe or recovery" mode: brightness at startup in normal mode, instead to remain unchanged, is forced to maximum, in the same way one pressed the brightness keys.

THIS IS WHAT FIXED THE ISSUE FOR ME (Date: 23rd May 2018):

1. I opened Device Manager. 
2. Noticed that Display Adapters section was reporting problem (showing exclamation sign) for the "Intel HD Graphics 620". (This solution may work for other onboard graphics too).
3. I right clicked on that and chose "Update driver" option. 
4. On the pop-up window, I chose "Search automatically for updated driver software" option. 
5. Windows searched and automatically installed the driver software over Internet and the Brightness Controls started working again immediately (without restarting the PC). 
6. Device Manager also stopped reporting problem with Display Adapter.

I hope this helps some of you if not all of you.