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Adaptive brightness is a Windows setting you can change in the Power Options control panel. Click 'Change plan settings' next to your chosen power plan, click 'Change advanced settings', click 'Display', click 'Enable adaptive brightness' and change it to off.

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I don't have windows installed, but it's highly unlikely that it'll help. This feature is baked into panel firmware, and while Dell releases firmware updates for some models, there is no official fix for 9360 FHD. For models with the fix there are two versions of firmware: with CABC support and without. Switching requires firmware reflash with a special vendor tool. So it's unlikely that there is a dynamic setting to switch it off.

Oh. The setting works in Windows on my XPS 13, but I have the 3200x1800 display. I disabled adaptive brightness the day I bought it, because it annoyed me for the same reasons.

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