https://wccftech.com/2021-macbook-pro-will-experience-decreased-display-brightness-if-the-room-temperature-is-high/

Apple's new 2021 MacBook Pro models feature enhance battery life along with steller performance capabilities. We have previously covered several comparisons and the new M1 Pro and M1 Max chips stand out when it comes to power efficiency while delivering top-class performance. The new 2021 MacBook Pro models also come with a brand new design and an all-new Liquid Retina XDR display. We are now hearing that a warning symbol might show up on the new 2021 MacBook Pro models with Liquid Retina XDR display when screen temperature increases which will result in decreased brightness. The same is also applicable for the company's Pro Display XDR.

Apple has shared a new support document today that highlights a warning symbol that can show up when the 2021 MacBook Pro's Liquid Retina XDR display gets hot. Ultimately, this will allow the brightness level of the screen to be lower. The company explains that a caution symbol in the Control Center or the menu bar on the 2021 MacBook Pro or the Pro Display XDR means that the display is "using limited brightness" or in low power mode. The reason for the decreased brightness on the 2021 MacBook Pro and Pro Display XDR is the high temperature.