I have the same problem for the last 5 months after the Big Sur update.
My issue is that I can't adjust the brightness in anyway. The touchbar show the bar of the brightness but nothing changes, the brightness is always at maximum.
I updated my OS 4 or 5 times and nothing changes.
Machine info:
MacBook Pro (13-inch, 2017, Four Thunderbolt 3 Ports)
3,1 GHz Dual-Core Intel Core i5
Intel Iris Plus Graphics 650 1536 MB
ZuZanoa
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