Problem with the brightness in Oreo. Automatic brightness disabled

[JavierGS1]

I have the automatic brightness disabled, but since a few days ago I updated Oreo, the following happens to me: when I am on the street or in a very bright place, the screen becomes brighter; the level of brightness does not vary but it is more whitish, and blacks look more gray and with less contrast. When I plug the sensor with my finger, everything returns to normal, and when I remove the finger, it happens again.
Does this happen to someone? As I was saying, automatic brightness is disabled.

Sorry for the english, and Thanks

[ChristianGetz]

I have the same Problem!!!

Does anyone Know how to fix this? 

[reikar]

It might be the "Content Adaptive Backlight" setting. You can't find it in regular menu.
But for example, download QuickShortcutMaker and search from there to get to this menu.

Or some other related settings that we don't know about.

Or this: /t5/Xperia-XZ-Premium/Display-oversaturates-contrast-gamma/td-p/1248911#gref

[JavierGS1]

I'm not sure it's Qualcomm's fault, because with Marshmallow and Nougat it did not happen, only since the Oreo update.