Brightness issue on game start up

That brightness jump sounds like it could be tied to how the game is handling fullscreen or HDR settings. Sometimes Steam games force brightness/contrast differently than Windows display settings. You can try running the game in windowed/borderless mode or disabling HDR in Windows display options. Also make sure your GPU drivers are updated. For more gaming fixes and tips, you can check this site.

It sounds like a frustrating issue—especially when your games were running fine before.

This kind of sudden screen brightness spike usually points to one of the following:

🔍 Possible Causes & Fixes:
Display Driver Glitch
Even if your drivers are up to date, they can still get corrupted. Try doing a clean reinstall of your GPU drivers using Display Driver Uninstaller (DDU) and then reinstall the latest drivers from your GPU manufacturer's website (Intel/NVIDIA/AMD).

Windows HDR Settings
Go to Settings > System > Display and check if HDR is turned on. If it is, try turning it off. HDR can cause brightness and color issues in certain games.

Steam Overlay / In-Game Settings
Check if the games that are affected have any specific in-game brightness or gamma settings that might have been changed.
Also, try disabling Steam Overlay:

Right-click the game > Properties > General > Uncheck "Enable the Steam Overlay while in-game".

Asus Software Conflicts
If you have any Asus-specific utilities like Armoury Crate, GameVisual, or MyASUS, they might be forcing display profiles. Try temporarily disabling or uninstalling them and see if the issue goes away.

Color Calibration or Night Light Settings
Go to Settings > System > Display > Color Profile or check if Night Light is enabled. If anything’s off, reset the color calibration.

✅ Quick Test:
Try launching one of the problematic games in Windowed Mode and see if the brightness issue still happens. This can help isolate whether it's a full-screen rendering problem.

Let us know your specs (GPU model, OS version) and which games are affected—might help narrow it down even further!

Hope this helps!

That sounds really frustrating, especially when everything was working fine before. Sudden brightness spikes like that can be caused by auto-brightness settings, GPU driver updates, or even Windows display enhancements interfering with how the game launches. You might want to check if "Auto Brightness" or "Adaptive Brightness" is enabled in your Windows settings or your GPU control panel (like Intel or NVIDIA). Disabling those sometimes helps. Also, try running the game in windowed mode as a temporary workaround—it might prevent the brightness spike. Hope it gets sorted soon!

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