macOS Monterey 12.3 Beta 2 Appears to Fix Bluetooth-Related Battery Drain Issue During Sleep Mode

Following the release of macOS Monterey 12.2 last month, some Mac users who installed the software update started to experience excessive battery drain during sleep mode, seemingly due to Bluetooth accessories frequently waking up the machines. The issue appears to affect Macs running the first beta of macOS 12.3 as well.

macOS Monterey on MBP Feature
Many affected users found their Mac's battery life dropped from 100% to 0% while in sleep mode overnight. A few users tried to identify a cause in Terminal and found that Bluetooth accessories were frequently causing a "DarkWake from Deep Idle" that resulted in the Mac repeatedly waking from sleep and draining the battery's charge.

Fortunately, it appears that the second beta of macOS 12.3 seeded today may resolve the issue. In a tweet, Mr. Macintosh said his 2018 MacBook Pro that was experiencing the issue on the first beta of macOS 12.3 is no longer affected on the second beta.


macOS 12.3 will likely be publicly released around March or April, providing a fix for all affected users. In the meantime, users can disable Bluetooth on their Mac or disconnect all Bluetooth accessories overnight to prevent battery drain.

Related Forum: macOS Monterey

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Top Rated Comments

ouimetnick Avatar
30 months ago
They really need to release 12.2.1 and fix this sleep issue NOW. Why do show stopping bug fixes need to wait until 12.3?
Score: 21 Votes (Like | Disagree)
sideshowuniqueuser Avatar
30 months ago

By the way, and just out of curiosity, how do bugs like this get past beta testers?
As a software dev, the real question I ask is, how do these bugs even make it past the dev team in the first place, let alone the test team?

Beta testing should only be catching any bugs involving combinations of other software or hardware that cause unforeseen complications. These should be rare and unusual, and virtually impossible for the dev/test team to test for. However, I suspect the type of people that use beta testing releases are either nutjob fanb**s who accept anything Apple throws at them and cheers it along; or devs who are merely testing their own products on the upcoming updates. Thus, no one is actually doing any testing with beta releases. Either that, or Apple ignores the feedback.

Who knows. The constant rubbish that comes out of the Apple software divisions is mind blowing to me.
Score: 7 Votes (Like | Disagree)
TheYayAreaLiving ?️ Avatar
30 months ago

They really need to release 12.2.1 and fix this sleep issue NOW. Why do show stopping bug fixes need to wait until 12.3?
I agree. This fix should have been released urgently. Lately, I’ve been turning off the Bluetooth manually without having to rely on Touch Bar and it’s getting annoying.
Score: 5 Votes (Like | Disagree)
creativesmith Avatar
30 months ago
By the way, and just out of curiosity, how do bugs like this get past beta testers?
Score: 5 Votes (Like | Disagree)
MacMan988 Avatar
30 months ago
They should fix this issue faster than that.
Score: 4 Votes (Like | Disagree)
creativesmith Avatar
30 months ago

The software development process isn't that great for single fixes. You have a development line and releases fork off of that. If you make multiple forks, you have to apply the fix to all of the lines and also test them all. So instead you have the mainline and you fork a release and then you apply changes to the release and mainline along with the accompanying testing.
Yes, the process. But someday, if Apple becomes a big company with lots of employees and buckets of cash, maybe then they'll— nah.
Score: 3 Votes (Like | Disagree)