I have a serious problem changing the brightness on my laptop screen. Every time I use the slider to change the brightness nothing happens for a few sec (10sec) then there is a prompt for me to enter my password, the brightness changes once I input my password. This happens on every level. like for example, If I changed my brightness from 100% to 80%, then again from 80% to 50%, there will be two prompts to change my password.
Screenshot of prompt
Please fix this.