Display brightness at max after 1803 update

OS Name Microsoft Windows 10 Pro

Version 10.0.17134 Build 17134

Other OS Description Not Available

OS Manufacturer Microsoft Corporation

System Name DESKTOP-JAFO621

System Manufacturer Dell Inc.

System Model Vostro 3300

System Type x64-based PC

System SKU To be filled by O.E.M.

Processor Intel(R) Core(TM) i3 CPU       M 370  @ 2.40GHz, 2394 Mhz, 2 Core(s), 4 Logical Processor(s)

BIOS Version/Date Dell Inc. A12, 08/04/2014

SMBIOS Version 2.6

Embedded Controller Version 1.02

BIOS Mode Legacy

BaseBoard Manufacturer Dell Inc.

BaseBoard Model Not Available

BaseBoard Name Base Board

Platform Role Mobile

Secure Boot State Unsupported

PCR7 Configuration Binding Not Possible

Windows Directory C:\Windows

System Directory C:\Windows\system32

Boot Device \Device\HarddiskVolume1

Locale United Kingdom

Hardware Abstraction Layer Version = "10.0.17134.1"

Username DESKTOP-JAFO621\Muneeb Ejaz

Time Zone Pakistan Standard Time

Installed Physical Memory (RAM) 6.00 GB

Total Physical Memory 5.80 GB

Available Physical Memory 3.58 GB

Total Virtual Memory 7.43 GB

Available Virtual Memory 5.41 GB

Page File Space 1.63 GB

Page File C:\pagefile.sys

Kernel DMA Protection Off

Virtualisation-based security Not enabled

Device Encryption Support Reasons for failed automatic device encryption: TPM is not usable, PCR7 binding is not supported, Hardware Security Test Interface failed and the device is not InstantGo, Un-allowed DMA-capable bus/device(s) detected, TPM is not usable

Hyper-V - VM Monitor Mode Extensions Yes

Hyper-V - Second Level Address Translation Extensions Yes

Hyper-V - Virtualisation Enabled in Firmware Yes

Hyper-V - Data Execution Protection Yes

This solution from Ferdz Amp solved my problem.

For those still encountering this issue, I recommend that you follow these steps and see if the issue persists:

1. In Windows start search box, type in regedit and hit Enter.
2. Navigate to the following key:
   • HKEY_LOCAL_MACHINE/SYSTEM/ControlSet001/Control/Class/ 4d36e968-e325-11ce-bfc1-08002be10318 /0000
3. Double-click the item of FeatureTestControl, set the hexadecimal value to "fb20", and click OK.
4. Reboot your computer to reflect the changes.

Registry Disclaimer: The steps mentioned here includes system registry modification. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow the steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: Article ID 322756.

Let me know how it goes.

The written location for FeatureTestControl was different on my system. The location was:

• HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0001

Please be aware that after doing this edit, selecting the lowest level of brightness will turn off your screen. This also means that if you are running on battery (laptop) and you select the power mode "Best battery life" or Windows automatically switches to "Best battery life" upon unplugging the charger, your screen will be turned OFF! This is not a major concern since you can just turn up the brightness to the next lowest level via the FN+F3 (key combo might differ on other laptop brands) keyboard control shortcut and the screen will be turned back ON.

Taken from here:

https://answers.microsoft.com/en-us/windows/forum/windows_10-update/screen-brightness-stuck-at-maximum-after-updating/2c364180-cab4-4704-b07f-701a1bac89a5?tm=1525126129348

Thank you very much for helping me, it worked for me.

that does not mean that the problem is the

Windows Update April 10, 2018 (version 1803)

Hey Andre,

I have the same problem. I hope you can help me. I tried what you mentioned, but in vain. I am attaching my system summary.

OS Manufacturer Microsoft Corporation

System Name LENOVO-PC

System Manufacturer LENOVO

System Model 20042

System Type x64-based PC

System SKU Calpella_CRB

Processor Intel(R) Core(TM) i3 CPU       M 380  @ 2.53GHz, 2533 Mhz, 2 Core(s), 4 Logical Processor(s)

Requesting your help on this,

Augus J. Edakkara

Esta solución de  Ferdz Amp resolvió mi problema.

Para aquellos que aún tienen este problema, les recomiendo que sigan estos pasos y vean si el problema persiste:

1. En el cuadro de búsqueda de inicio de Windows, escriba  regedit y  presione Enter.
2. Navegue a la siguiente clave:
   • HKEY_LOCAL_MACHINE / SYSTEM / ControlSet001 / Control / Class / 4d36e968-e325-11ce-bfc1-08002be10318 / 0000
3. Haga doble clic en el elemento de  FeatureTestControl, establezca el valor hexadecimal en " fb20" y haga clic en  Aceptar.
4. Reinicia tu computadora para reflejar los cambios.

Descargo de responsabilidad del registro: los pasos mencionados aquí incluyen la modificación del registro del sistema. Sin embargo, pueden producirse problemas graves si modifica el registro de forma incorrecta. Por lo tanto, asegúrese de seguir los pasos cuidadosamente. Para mayor protección, realice una copia de seguridad del registro antes de modificarlo. Luego, puede restaurar el registro si ocurre un problema. Para obtener más información acerca de cómo hacer una copia de seguridad y restaurar el registro, haga clic en el siguiente número de artículo para ver el artículo en Microsoft Knowledge Base: ID del artículo  322756.

Déjame saber como va.

La ubicación escrita de  FeatureTestControl era diferente en mi sistema. La ubicación fue:

• HKEY_LOCAL_MACHINE \ SYSTEM \ ControlSet001 \ Control \ Class \ {4d36e968-e325-11ce-bfc1-08002be10318} \ 0001

Please be aware that after doing this edit, selecting the lowest level of brightness will turn off your screen. This also means that if you are running on battery (laptop) and you select the power mode "Best battery life" or Windows automatically switches to "Best battery life" upon unplugging the charger, your screen will be turned OFF! This is not a major concern since you can just turn up the brightness to the next lowest level via the FN+F3 (key combo might differ on other laptop brands) keyboard control shortcut and the screen will be turned back ON.