Display brightness at max after 1803 update

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

Worked so perfectly for me!

God bless you!

feature test control not found

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

:(

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

Tenga en cuenta que después de hacer esta edición, seleccionar el nivel más bajo de brillo apagará su pantalla. Esto también significa que si está utilizando la batería (portátil) y selecciona el modo de alimentación "Mejor duración de la batería" o Windows cambia automáticamente a "Mejor duración de la batería" al desconectar el cargador, ¡la pantalla se APAGARÁ! Esto no es una preocupación importante ya que puede aumentar el brillo al siguiente nivel más bajo mediante el atajo de control de teclado FN + F3 (combinación de teclas podría ser diferente en otras marcas de portátiles) y la pantalla volverá a encenderse.

feature test control not found

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

:(

Try this location instead:

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

For anyone having problems with this, here is what worked for me. My Intel HD Graphics driver couldn't install due to the "This operation returned because the timeout period expired" error (0x000005b4).

Symptoms:

• Intel driver can't be installed from Windows Update, manually nor from Intel installer
• Advanced GPU features are not working (video acceleration, brightness can't be adjusted)

First solution to this problem is increasing the timeout period through Group Policy Editor (works only in Pro and higher editions): https://techjourney.net/change-device-installation-timeout-in-windows-fix-0x000005b4-error/

If that doesn't work (it didn't work for me), try this (tested on Windows 10 1803):

1. Open C:/Windows/INF. This is a driver store where Windows copies all the drivers that were installed at some point. In my case, the driver store was containing a corrupted copy of the Intel HD Driver which was overriding the new files - that's why I couldn't install new drivers.
2. Open this file: setupapi.dev.log.

This is a logfile of all driver installations, scroll to the bottom (for most recent entries) and look for this line: "<<<  [Exit status: FAILURE(0x000005b4)]"

Then scroll up and look for these - these lines confirm that the log entry is from installing Intel HD Graphics driver - here the driver installer decides to install the Intel driver over the generic Microsoft one:

"    dvi:                {Select Best Driver}

dvi:                     Class GUID of device changed to: {4d36e968-e325-11ce-bfc1-08002be10318}.

dvi:                     Selected Driver:

dvi: Description - Intel(R) HD Graphics Family

dvi:                          InfFile     - d:\downloads\inteldrivergen\graphics\igdlh64.inf

dvi:                          Section     - iHSWM_w10

dvi:                     Skipped Basic Driver:

dvi:                          Description - Microsoft Basic Display Adapter

dvi:                          InfFile     - C:\WINDOWS\INF\display.inf

dvi:                          Section     - MSBDA

dvi:                {Select Best Driver - exit(0x00000000)}"

Under these lines, there should be this section:

"     ndv:      Driver package 'C:\WINDOWS\System32\DriverStore\FileRepository\igdlh64.inf_amd64_8237dc5d3c101a63\igdlh64.inf' is already imported.

sto:      {Setup Import Driver Package: d:\downloads\inteldrivergen\graphics\igdlh64.inf} 18:27:58.774

sto:           Driver package already imported as 'oem7.inf'.

*sto:      {Setup Import Driver Package - exit (0x00000000)} 18:27:58.868"*If you've found this, it means that installation continued from the driver store, not from wherever you're installing your driver. If you can't find this line, your problem is different than mine, so don't proceed with my solution.It's OK if the file contains more than one section looking like this, each one represents one failed attempt to install the driver. 3. Note down the filename from previous step

"sto:           Driver package already imported as 'oem7.inf'." 4. Find the file at C:/Windows/INF, open it and make sure that it contains: "Installation INF for the Intel Corporation graphics adapter" to make sure that you are going to delete the right driver. If the file contains names of other companies than Intel or it doesn't state it's for the graphics adapter, return to the previous step and check that you have the right file name and that you opened the right file. Don't proceed if you can't find INF file for your graphics adapter. 5. Open Command line with administrator privileges (Open Search, type "cmd", right-click Command Line and select Run as administrator).

Type this command and replace the <drivername.inf> with a file name from the previous step: "pnputil  /delete-driver <drivername.inf>"

Example: "pnputil  /delete-driver oem7.inf"

This will delete the Intel HD driver from the driver store. 6. Try to install your driver again, it should work now.

I will be very happy if I helped anyone with a similar problem. Good luck!