After each boot following an update, the display brightness appears visually at 100%. I have to manually adjust it slightly to return to the previously set value. What is causing this issue and how can I fix it?
Install backlight-openrc or whatever your init.
acpilight :
I just use acpilight to adjust the brightness.
I created four icons in a panel that automatically retracts:
https://forum.artixlinux.org/index.php/topic,3027.msg19679.html#msg19679
Thank you guys. The backlight-openrc service seems to be working. I was previously using xbacklight (which looks similar to acpilight), but I probably don't need it. I can control brightness, though my settings disappeared after the update. The backlight-openrc service solved the issue.