Adaptive brightness broken after 8.1

[b3zCesr]

Adaptive brightness totally stopped working after I upgraded to 8.1. Turning it off/on returns brightness to 16% no matter how I play with the brightness itself, whether while adaptive brightness is on or off. Covering the sensor has zero effect and it used to work pretty well.
Edit: phone is ta-1003

 

[b3zCesr]

Little update with the incredibly useful reply from Nokia support: (/s)

Welcome to Nokia Mobile Care!

Some time the brightness screen is not working, I understand the inconvenience that you face. it is depend on the sensor and condition, on the all brand phone face this issues. do not worried. you can restart the device. make sure that if you use screen protector for sure this issues exist.

You also can take manual action if disabling enabling take you time. I hope you understand.

Also you can take 3rd apps from play store to try is that working better.

 

[reddogco]

I have the same issue with the auto brightness setting: it goes to 11% and that's it. Not sure if this started after the N 8.1 update.
Where is the ambient light sensor located on the phone?