Ensure that Startup or wake is unchecked (unless, of course, you actually want your system to startup or sleep at a specific time).Īs it turns out, my particular situation was indeed the result of “Wake for network access” being checked in the Energy Saver preference pane.While still in the System Preferences > Energy Saver window, click Schedule….I also had a few UHC and EHC codes mixed in there, which was probably me (or someone in my family) clicking the mouse or keyboard to wake the system from sleep. Because of the RTC codes, I decided to check my settings in the Energy Saver system preferences. It can also be from a launched setting, user applications, backups, and other scheduled events.Īs you can see from my Terminal screenshot, I had a RTC code kicking off every two hours. RTC: Real Time Clock Alarm, is generally from wake-on-demand services like when you schedule sleep and wake on a Mac via the Energy Saver preference pane.PWRB: Power Button, which is the physical power button on your Mac.LID0: this is literally the lid of your MacBook portable, when you open the lid the machine wakes up from sleep.EHC: Enhanced Host Controller is another USB interface, but can also be wireless devices and bluetooth since they are also on the USB bus of a Mac.If you see OHC1 or OHC2 it is probably an external USB keyboard or mouse that has woken up the machine. OHC: Open Host Controller (usually a USB or Firewire device).Ok, so my system is waking from sleep on a regular basis due to a RTC code, but what does that actually mean? Well, I found a blog post over at explains the codes in more detail: I ran the terminal commands on my system, and in the screenshot below, the logs showed that a “Wake from sleep” instance was occurring almost every two hours!.For Mac OS 10.11 “El Capitan” or earlier:.Open a new Terminal window (found in /Applications/Utilities) and run one of the following commands (based on your OS version):.So, I took to the web to see if I could figure out the issue and here’s what I found: Check the logs using Terminal At first, it didn’t seem like much of an issue, but I recently noticed that it seemed to be recurring at regular intervals, almost on a schedule of sorts. Occasionally, my Mac would wake itself up from sleep mode every now and again. This, in my opinion, is one of those times. Now, I know I said this blog was going to focus mostly on virtualization and all, but every once in a while, you stumble across a tech-related issue and a fix or workaround that’s just worth sharing.
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