Display brightness at max after 1803 update

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)

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

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

yo tengo el mismo problema él hizo todo y el problema sigue igual.

Nombre del SO Microsoft Windows 10 Pro

Versión 10.0.17134 compilación 17134

Descripción adicional del SO No disponible

Fabricante del SO Microsoft Corporation

Nombre del sistema ESCRITORIO-29V5QAJ

Fabricante del sistema Hewlett-Packard

Modelo del sistema PC portátil HP Pavilion dv6

Tipo de sistema PC basado en x64

SKU del sistema LE457EA # UUZ

Procesador Intel (R) Core (TM) i5 CPU M 480 a 2.67 GHz, 2667 Mhz, 2 procesadores principales, 4 procesadores lógicos

Versión y fecha de BIOS Hewlett-Packard F.29, 7/11 / 2011

Versión de SMBIOS 2.6

Versión de la controladora integrada 101.56

Modo de BIOS Heredado

Fabricante de la placa base Hewlett-Packard

Modelo de placa base No disponible

Nombre de la placa base Placa base

Rol de plataforma Móvil

Estado de arranque seguro No compatible

Configuración de PCR7 Enlace no posible

Directorio de Windows C : \ Windows

Directorio del sistema C: \ Windows \ system32

Dispositivo de arranque \ Dispositivo \ HarddiskVolume1

Configuración regional España

Capa de abstracción de hardware Versión = "10.0.17134.1"

Nombre de usuario DESKTOP-29V5QAJ \ kelvi

Zona horaria Hora estándar oeste, Sudamérica

Memoria física instalada (RAM) 4,00 GB

Memoria física total 3,80 GB

Memoria física disponible 1,62 GB

Memoria total virtual 5,93 GB

Memoria virtual disponible 3,27 GB

Espacio de archivo de paginación 2,13 GB

Archivo de paginación C: \ pagefile.sys

Protección de DMA de kernel Desactivada

Seguridad basada en la virtualización No habilitado

Compatibilidad con cifrado de dispositivo Razones del error de cifrado automático del dispositivo: No se puede usar TPM, No se admite el enlace PCR7, Error en la interfaz de seguridad de hardware y el dispositivo no se configura como InstantGo., Se detectó un bus o un dispositivo compatible con DMA que no se permite. No se puede usar TPM

Hyper-V - Extensiones de modo de monitor VM Sí

Hyper-V - Extensiones de traducción de segundo nivel Sí

Hyper-V - Virtualización habilitada en Firmware Sí

Hyper-V - Protección de ejecución de datos Sí

yesterday Microsoft released new cumulative update for 1803 with some fixes did that fixed your issue?