Screen on Max Brightness Appears Slightly Dim After Sleeping, MacBook Pro 2015
Just figured this out for my case. I had already disabled the brightness from automatically adjusting. Every time my computer woke up from sleep however the brightness would still drop to around 50%.
Turns out I also needed uncheck the box to &quot;Slightly dim the display while on battery power&quot;
System Preferences &gt; Battery &gt; Slightly dim the display while on battery power
See the image below: