MAC: Display Sleep Issues
Because I normally leave my machines running 24/7, i try to set the displays to sleep after 3 minutes (to save some power, prevent burn in, etc.). In my current home office setup I have 2 iMacs side by side. Lately I’ve noticed one of them has the display go to sleep, and stay asleep, while the other does not. The iMac’s screen will go to sleep, but in about 15-20 seconds it will come back on and continue in a cycle like this. It’s very annoying at night, when all lights are turned off, not to mention WHY!!! I verified the 2 iMacs power save settings and screen saver settings were identical. I of course perused Google, and other sites for a solution to no avail. I finally pieced together info from here and there and have found a solution. Apparently it lies in your Sharing settings within System Preferences.
If you reside on a public network, or even on a network with several other macs, and you have “Remote Management” set to allow “All Users” you can end up getting some unwanted users trying to connect to your machine. Once I configured “Remote Management” to only allow specific users to access the machine, the annoying cycle was stopped. If I had to guess, this has to do with a heartbeat coming from bonjour enabled clients.
-Phenix
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