Some Siri Brightness Adjustment Commands Don’t Work It’s worth mentioning that if you turned off MacBook auto-dimming that adjusting the screen brightness won’t change itself again if the ambient lighting situations change, so you’d need to adjust it again on your own through Siri or otherwise. Making the screen darker or brighter is just one of many commands that Siri can do (and yes it works on the Mac as well as iOS).You can find many other helpful Mac Siri commands with this list here, and query Siri directly for command ideas too. These voice commands to Siri will decrease the screen brightness on the Mac: Press your keyboard shortcut to activate Siri, then issue the appropriate voice command to adjust down the screen brightness. Tell Siri “Make the Screen Dimmer” on the Mac The following type of voice commands to Siri will increase the display brightness on a Mac: Hit your keyboard shortcut to activate Siri (the default is holding down Option + Spacebar), then issue your voice command to increase the screen brightness. Tell Siri “Make the Screen Brighter” on the Mac This can offer a quicker option to adjust display dimness and brightness for some Mac users, and voice commands offer an alternative approach to the keyboard adjustments and Display preference panel adjustment options.

Shortcut key to adjust brightness mac