zlacker

>>speckx+(OP)
Another trick is to open Activity Monitor, switch to the Energy tab, and sort by the "Preventing sleep" column. Some apps prevent macOS from sleeping.

In my case, I've discovered that Devonthink (document/notes management app) is responsible. I've been meaning to file a bug report about it.

I'm surprised that Apple's power management doesn't have an alert for this. Surely an app that causes my Mac to become glowing hot while sitting in my backpack, not to mention slowly running out of battery, is a pretty important thing to intercept. Meanwhile, I keep being asked if Chrome should be allowed to find devices on my network, which doesn't seem nearly as important.

>>atombe+xg
I didn't realize any rando app could prevent the entire system from sleeping. Shouldn't this power be gated behind a user-controllable permission? I assume the developer needs to at least use an entitlement to call whatever API does this...?

>>ryandr+1i
What I find interesting is that system services, like Time Machine, don’t prevent sleep… even when Sleep Aid showed at setting where it will wake to back up.

About half the time when I wake my MBP there is a notification waiting for me about Time Machine failing to finish because the system went to sleep. My TM drive is a SSD connected with USB-C. First initial backup took maybe 3-5 minutes. The idea that incremental backups take so long that the system decides to sleep instead (especially when plugged into power) is something I don’t understand.

Now that I’m typing this, I wonder if I have a different issue going on. I moved the drive so it’s plugged into my display. The display powers my laptop and acts as a USB hub. I wonder if the monitor going to sleep is killing power to the drive… but I’d expect an improper ejection notice if that was the case.

>>al_bor+5N
I have a similar issue with Time Machine backups. I’ll plug in wall power and a USB drive, do `caffeinate -u -t 7200` or so - and still Time Machine often fails to complete.