Disable adaptive contrast/brightness on new UWD/DCH drivers

Apr 14, 2019

5 min read

[2021-06-19 – updated steps for installing the Dell.com Intel command center app]

Introduction

Does the brightness of your Windows laptop screen appear to flicker like it has a mind of its own? If so, you may have already tried one or more of the following solutions:

Disabling adaptive brightness in Windows 10/11 settings
- Settings – System – Display – uncheck “Change brightness automatically when lighting changes”
Disabling content adaptive brightness/contrast in Windows 11
- Settings – System – Display – uncheck “Help improve battery by optimizing the content shown and brightness”
Applying a widely cited FeatureTestControl=9250 regkey modification via a DPST control script or manual registry edit for Intel GPU systems

On some versions of Windows and GPU drivers, these methods won’t work 100% and you may still get brightness and flickering issues as the hardware and software struggle to balance power consumption vs image quality & consistency.

Similar issues happen across Intel, AMD and Qualcomm based systems. Below are a set of steps you can take to mitigate these issues.

Qualcomm Adreno GPU systems (Surface Pro X):

Unfortunately, there is no control panel for Qualcomm GPUs but the following steps can reduce flickering for many users:

Ensure firmware is up to date
Select the battery icon on the Windows taskbar
- Move the slider to the Best performance setting
Start – Device Manager
- Scroll down and open “Sensors”
- Double-click “HID Ambient Light Sensor”
- Click “Driver” – “Disable device” – “Yes”

Please share your findings with these settings. In particular, please report whether you still see flicker/dimming symptoms in office apps, full screen video/movies, or gaming/3D graphics workloads on and off AC/Mains power.

Update: Try this BETA driver download from Microsoft: https://aka.ms/x64previewdriverprox

Intel or Intel+NVIDIA GPU systems

Download the Intel Command center from the Microsoft Store (works for most systems – but see step 4 for an alternate Dell.com version which enables more settings)
Change settings – Open the Intel Graphics Command Center app and change the settings:
- If the app won’t run, settings mysteriously revert to defaults, or if settings are missing or greyed out, install the latest official Intel.com GPU driver, reboot, and then re-run the app.
- If settings are still missing, goto step 4 and install the Dell.com version of the command center app which reveals more settings on some systems – then return here
- Start – Intel Graphics Command Center
- System – Power
- if available, switch “Display Power Savings” and “Adaptive brightness” off
- if available, switch “panel self-refresh” off to workaround periodic freezing issues on Surface Pro 4 and other systems
- Apply
- Yes
Optional – Select the battery icon on the Windows taskbar and move the slider to the Best performance setting
Optional – Install Dell.com version of the Intel Command Center to reveal more settings:
- enable side-loading or developer mode in the Windows settings app
- Uninstall all previous versions of the Intel command center app.
- Download the Dell.com version of the Intel Command Center app
- double-click the .exe file and select “extract”
- right click and create a new folder named “dell”
- select the newly created “dell” folder a folder and proceed with extraction. (you can also use the 7-zip tool to extract)
- Once extracted, right-click the 18c529d76f9946b3b73eac52ac582bd5.appxbundle file which will reveal an “install” option. Click install.

Alternate Solution for Intel – regkey method:

An alternative to applying settings manually via the Intel command center app is applying the regkey settings directly. This can be particularly helpful for IT admins deploying multiple systems where callbacks due to the flickering is expected. This approach may not work for all systems and depending on which version of the Intel GPU drivers are installed, some registry keys may not be present.

Windows Registry Editor Version 5.00;Disable DPST on Intel UWD/DCH drivers - dancharblog;; -----Instructions: -----;- copy this text into notepad;- save as DPST-off.reg;- double-click the file and follow the prompts to import changes;- reboot;- if the changes don't do anything, in the line below that starts with

"[HKEY_" change "\0001" to "\0000" or "\0002" and retry the above steps

; ------------------------;[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}

\0001]

"ACUserPreferencePolicy"=dword:09020000"DCUserPreferencePolicy"=dword:09020000"DisplayFeatureControl"=dword:000003e3"Dpst6_3ApplyExtraDimming"=dword:00000000"FeatureTestControl"=dword:00008200"PowerAcPolicy"=dword:c1bac1ba"PowerDcPolicy"=dword:c9bac0b8"PowerDpstAggressivenessLevel"=dword:00000001"PowerGpsAggressivenessLevel"=dword:00000001"PowerPlanAwareFeatureSettings"=hex:ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,02,01,02,00,00,00,02,01,02,00,02,01,02,01,02,00,02,01,02,01,02,00,02,01,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,01,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00,06,00,00,00,04,00,00,00,00,01,00,00

How to determine regkeys adjusted via the Intel Command center app:

I used the Procmon utility from SysInternals.com to track the exact regkey changes when using the Intel Control Panel UI. Here are some of the records that changed:

1:32:51.9971838 PM GfxCentennial.exe 5156 RegCreateKey HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 SUCCESS Desired Access: Write, Disposition: REG_OPENED_EXISTING_KEY1:32:51.9972349 PM GfxCentennial.exe 5156 RegSetValue HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001\PowerPlanAwareFeatureSettings SUCCESS Type: REG_BINARY, Length: 256, Data: FF FF 00 00 00 00 00 00 00 00 00 00 00 00 02 011:32:51.9973189 PM GfxCentennial.exe 5156 RegCloseKey HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 SUCCESS1:32:51.9973375 PM GfxCentennial.exe 5156 RegCreateKey HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 SUCCESS Desired Access: Write, Disposition: REG_OPENED_EXISTING_KEY1:32:51.9973773 PM GfxCentennial.exe 5156 RegSetValue HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001\DCUserPreferencePolicy SUCCESS Type: REG_DWORD, Length: 4, Data: 1310721:32:51.9974273 PM GfxCentennial.exe 5156 RegCloseKey HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 SUCCESS1:32:51.9974438 PM GfxCentennial.exe 5156 RegCreateKey HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 SUCCESS Desired Access: Write, Disposition: REG_OPENED_EXISTING_KEY1:32:51.9974809 PM GfxCentennial.exe 5156 RegSetValue HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001\ACUserPreferencePolicy SUCCESS Type: REG_DWORD, Length: 4, Data: 1310721:32:51.9975289 PM GfxCentennial.exe 5156 RegCloseKey HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 SUCCESS1:32:51.9975456 PM GfxCentennial.exe 5156 RegCreateKey HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 SUCCESS Desired Access: Write, Disposition: REG_OPENED_EXISTING_KEY1:32:51.9975823 PM GfxCentennial.exe 5156 RegSetValue HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001\PowerDcPolicy SUCCESS Type: REG_DWORD, Length: 4, Data: 33844535601:32:51.9976303 PM GfxCentennial.exe 5156 RegCloseKey HKLM\System\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001 SUCCESS

I then exported the registry keys before and after changing the settings.

AMD GPU systems (Surface Laptop 3/4, etc)

Select the battery icon on the Windows taskbar
- Move the slider to the Best performance setting – this will resolve some, but not all flickering issues.
Install the AMD Radeon settings app from the Microsoft Store (Note – if this version fails to install, complete step 3 to install the AMD.com drivers. If this step succeeds, skip step 3)
Install latest AMD.com Radeon GPU driver and control panel on Surface:
- Download the latest official .exe Radeon driver from amd.com
- Start – Device Manager
- Navigate to “Display Adapters” and double-click the AMD Radeon device
- Driver tab -> Update Driver -> Browse my computer… -> Let me pick…
- Scroll to the bottom of the list and click “Microsoft Basic Display Adapter”
- Click “Next”
- External monitors will switch off and the screen resolution, refresh rate, and color profile may change
- Close Device Manager
- Double-click the .exe driver downloaded from amd.com and follow the prompts
- Reboot
Open the Radeon settings app and navigate to “Display”
- If an option for “Vari-Bright” is available, disable it.

Alternate solution #1 – Legacy Catalyst Control Panel method

Another solution is using the legacy AMD Catalyst Control panel which can set the vari-bright regkey and disable the FreeSync option which can cause related issues. The Catalyst package is quite old and may not run properly on newer systems, so is not recommended for general use but you can try these steps:

Open the control center
Goto Power – Powerplay – ensure “Enable Vari-Bright” is not checked
Goto “My displays” (or similar) – Properties – ensure FreeSync is disabled

Alternate Solution #2 – regkey method

Windows Registry Editor Version 5.00;Disable Vari-bright on AMD UWD/DCH drivers - dancharblog;; -----Instructions: -----;- copy this text into notepad;- save as varibright-off.reg;- double-click the file and follow the prompts to import changes;- reboot;- if the changes don't do anything, in the line below that starts with "[HKEY_" change "\0001" to "\0000" or "\0002" and retry the above steps; ------------------------;[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}

\0001]

"PP_VariBrightFeatureEnable"=dword:00000000

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