Many tips I discover myself – I spent a lot of time hacking OS X for my book Mac Kung Fu, attempting to find the likes of “default writes”. Hi Sean – Keir here, and I write this blog. To turn them back on again, open the Terminal window and paste-in the following, which again should be copied and pasted as a single line, before logging out and back in again, or restarting your Mac,: launchctl load -wF /System/Library/LaunchAgents/ To turn off the on-screen volume and brightness displays permanently, again open a Terminal window (as described above) and paste-in the following, which again should be copied and pasted as a single line: launchctl unload -wF /System/Library/LaunchAgents/ Restoring the overlay/HUD is easy: you’ll just need to log out and back in again, or simply restart your Mac. To turn off the on-screen volume and brightness displays, open a Terminal window (you’ll find it in the Utilites folder of the Applications list) and paste in the following, which should be copied and pasted as a single line: launchctl unload -F /System/Library/LaunchAgents/ Some people find it annoying, especially if they’re watching a movie because it can obscure the screen for several seconds before it disappears. This is sometimes known as a head-up display, or HUD. Whenever you adjust the screen brightness or audio volume on a Mac you’ll see a small grey box overlay appear showing the current setting. Turn off the Mac's volume/brightness screen overlays/HUDs
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