I've had a similar problem, I fixed it uncheck this.When using phone in darkness/low light environments, and with automatic and adaptive brightness enabled the screen wakes up with very low brightness (only a little portion of the brightness setting bar) and is almost unusable until you raise the level.
It's not too annoying in complete darkness but it wakes up with low brightness too when the room light is not too bright (in the morning/sunset).
Disabling adaptive brightness doesn't help.
On sunlight / normally lit room it wakes up on an usable brightness level (close to the middle of the brightness bar).