Auto brightness doesn't work proper
Check this it'll help you https://support.oneplus.com/app/answers/detail/a_id/440
Since Android 9 Google replaced auto brightness with adaptive brightness.
You need to manually adjust the brightness so the AI can learn from you
Try restart ur phone because for me it worked
I faces it too sometimes but meanwhile it automatically gets low or high when i use to go out..
It never learns/adapt according to your use.
It has been an issue with oneplus since the oos10 update
I have also this same issue... Not working properly
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by dsmonteiro, 2020-11-11