[watersb]

> Why not simply lower your screen brightness ?

On at least two cheap laptops I have used recently, the display driver steps down the overall display brightness when large regions of the screen are dark.

Windows 10 on an HP Stream 11, Intel integrated graphics and Intel display driver.

I can turn down the manual brightness to its minimal setting.

When large windows with white backgrounds are on screen, the backlight brightness increases. Decreases again when the windows are off screen or closed.

This does not change the manual brightness setting.

I have yet to find a tweak to disable this.

[abrowne]

At least some Dell XPS 13 have this. IIRC it's feature of the LCD panel itself.

[ac29]

It can be turned off in the BIOS (a change I made about 15 minutes after getting my XPS13, which I otherwise love).

[zimmi]

If I remember correctly, this can be toggled off in Power Options.