Auto-Brightness intermittently stops working, and screen brightness gets stuck at the wrong level (too low or too high), regardless of ambient lighting. It happens about 2 to 3 times per week. Locking/unlocking and a force restart have no effect.
Going to Settings → Accessibility → Display & Text Size → Auto-Brightness and toggling it off/on restores correct brightness immediately, every time. I never adjust brightness manually, specifically to avoid "training" the system into unusual preferences.
I have experienced this for several years, across different iPhones. Currently on iPhone 16 Pro Max (I always update to newest iOS version few hours/days after release.)
About 10 days ago I reset the phone and set it up as new (no restore from an iCloud backup, all apps downloaded manually). Everything was fine until yesterday, when it happened again: dark room, brightness stuck at about 50%, fixed only by toggling Auto-Brightness off/on.
I have now also seen exactly the same behavior on my Macbook Air M3, macOS [27.0.1]. I only recently started using Mac again after many years, so it may have been present there all along. The Macbook is new to me for only 3 weeks.
Since it survives a clean install and also appears on macOS, this looks like a software issue rather than settings or hardware. Has anyone else seen this, or found a permanent fix?
