Lenovo Yoga Slim 7i Gen 9 Intel Core Ultra 7 155H Brightness Auto Dimming Fix Windows 11

Turn Off Adaptive Brightness

Settings → System → Display → Brightness. Expand it and uncheck Change brightness automatically when lighting changes and Help improve battery by optimising content. This stops the ambient and content dimming on the Yoga Slim 7i Gen 9.

Disable CABC in Intel Graphics

Right-click desktop → Intel Graphics Command Center → System → Power. Set Display Power Saving or Content Adaptive Brightness Control to Off or Maximum Quality. This keeps the OLED at constant brightness for all content.

Adjust Battery Saver

Settings → System → Power and battery → Battery saver. Turn off Lower screen brightness when using battery saver so the Yoga Slim 7i Gen 9 does not dim when the charge drops.

Update the Intel Arc Driver

Install the latest Intel Arc graphics driver from Lenovo Support for Yoga Slim 7i Gen 9. Driver updates expose and stabilise the brightness control options so your changes stick after a restart.

Why does the brightness auto dim on Lenovo Yoga Slim 7i Gen 9?

The Lenovo Yoga Slim 7i Gen 9 OLED auto dims because of Content Adaptive Brightness Control (CABC), the ambient light sensor adjusting to the room, or the Windows Content adaptive brightness power setting. These dim the screen based on what is displayed or the surrounding light.

How do I stop auto dimming on Yoga Slim 7i Gen 9?

Turn off adaptive brightness in Settings → System → Display → Brightness, disable Content adaptive brightness control in the Intel Graphics Command Center, and switch off the ambient light sensor adjustment. These three together stop the OLED from dimming on its own.

What is CABC on the Yoga Slim 7i Gen 9?

Content Adaptive Brightness Control lowers backlight or panel brightness on darker images to save power. On OLED it can make the screen visibly dim when you open a dark window. Disabling CABC keeps brightness constant regardless of content.

Does battery saver dim the Yoga Slim 7i Gen 9?

Yes. Windows Battery saver reduces screen brightness when it activates at a low charge. Settings → System → Power and battery → Battery saver → turn off Lower screen brightness when using battery saver to prevent this dimming.