Brightness issue on game start up

1. Quick fix: 
Disable automatic brightness adjustment: 
Go to "Settings > System > Display" 
Turn off the "Brightness Auto Adjustment" option 
Uncheck the "Automatically change brightness by lighting changes" box 
2. Update the graphics card driver: 
Visit the official website of the graphics card manufacturer (NVIDIA/AMD/Intel) 
Download the latest Game Ready driver 
Select "Clean install" when installing it 
3. Gaming-specific Settings
 For NVIDIA card users 
Open NVIDIA Control Panel 
Go to "Adjust Desktop Color Settings" 
Turn off "Dynamic Range" auto adjustment 
4. For AMD card users 
Open Radeon Settings 
Disable "Vari-Bright" technology 
Lock Brightness in Game Profile 
5. Right click on Battery Icon > Power Options 
Select "High Performance" Mode 
Click on "Change Program Settings" > Turn off Adaptive Brightness 6. Adaptive Brightness 
6. Advanced Solutions 
Registry Repair: 
Press Win+R and type regedit 
Navigate to: 
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ICM 
Create a new DWORD value of "ForceLUTUpdate" and set it to 1. 
7. HDR Configuration Adjustment: 
Settings > System > Screen > HDR 
Turn off "Auto HDR" 
Calibrate HDR display (use built-in tool) 
8. Game Compatibility Settings 
Right-click on the game shortcut > Properties 
Compatibility Tab: 
Disable Full Screen Optimization 
Run as Administrator 
Graphics Settings > Add Game > Select "High Performance