Windows 10 on Lenovo T14 with Intel UHD Graphics has one very annoying behavior. The system automatically dims dark screens like a terminal window which becomes barely readable and the system brightens white screens like a web browser.
Here’s how you can disable this automatic dimming.
Press Windows key and type: Intel Graphics Command Center
Click icon with 4 squares a.k.a. System. Select Power tab, scroll down to Power Settings, uncheck Display Power Savings.
One other option is to dial down Power Efficiency to value like 1.
Option Enhanced Power Saving – Dims bright images for power saving – does not have effect.