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Seems like my decision to avoid Ventura like the plague has paid off. This is the first macOS in years that I've avoided. Hopefully the next one is better.
 
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What worked for me to fix Universal Control was ensuring the “host” computer — the one the Bluetooth keyboard and mouse are paired with — is booted after the “target” computer is fully booted. ¯\_(ツ)_/¯
I usually use the keyboard and trackpad from my laptop/iPad to control my iMac. Very rarely do I use iMac keyboard/trackpad to control laptop or iPad.
 
16.4 has been a hot mess. I must have double battery drain on my ipad to what it was on 16.3
 
What worked for me to fix Universal Control was ensuring the “host” computer — the one the Bluetooth keyboard and mouse are paired with — is booted after the “target” computer is fully booted. ¯\_(ツ)_/¯
I have one laptop sleeping and another iMac always on and restarting the host computer (iMac) usually solves my issues, so I guess is similar to your process.
 
I’m not noticing issues with continuity camera, handoff, or universal clipboard, but I am noticing a lot of issues like universal control doesn’t work at all or randomly disconnects, or sidecar lagging or not working even if plugged in. Very annoying
 
This thread is enlightening - my iPhone and work M1 MBA play nicely together. However my personal M1Pro MBP refuses to do speak to my iPhone (or any other device). I spent a lot of time debugging this with Apple support last summer and they said it would be fixed in a future release.
 
Add a feature to breaks 3 that "works".
They have literally forgotten how to produce good code.
It's mind boggling.
I honestly have no words.
 
I’ve not been able to get universal control to work for some time. It’s one of those areas that it either “just works” or it’s like it doesn’t exist, be there are no real settings to force a connection.
Same. But I noticed recently that it stopped working altogether. Didn't occur to me that 13.3/16.4 might be the cause until now.
 


Some Mac and iPad users who updated their devices to Apple's latest software updates are reporting problems with Continuity features like Universal Control and Handoff.

Universal-Control-Colored-Feature.jpg

Since last week's release of macOS 13.3 and iPadOS 16.4, many users have taken to the MacRumors Forums, Reddit, Twitter, and Apple's Support Communities to voice their frustration at the lack of functionality after updating.

Users also variously report problems with Handoff, Universal Clipboard, and Auto Unlock and Approve with Apple Watch. Based on online reports, the main Continuity feature to be negatively impacted by the updates appears to be Universal Control.

To recap the feature‌‌, if you have a Mac and an ‌‌iPad‌‌ next to each other and signed into the same Apple ID, you can use the keyboard and cursor on one device across both of them. So a Mac's trackpad can be used over on the ‌‌‌iPad‌‌‌ just by swiping across, and the Mac's keyboard will become the ‌‌iPad‌‌'s input device. The reverse is also true of an ‌‌‌iPad‌‌‌ if you have a keyboard and mouse attached to it.

Barring a restore of the previous OS, suggested solutions that have worked for some users include: Signing out of one's iCloud account on both devices; disabling, restarting, then re-enabling Handoff/Auto Unlock with Apple Watch; turning Wi-Fi and/or Bluetooth on and off again; and toggling checkboxes related to Universal Control features.

Apple has not commented on the Continuity bugs, but it is likely aware of them and working on solutions. The company is rumored to be preparing to release iOS 16.4.1 for the iPhone, so it could release iPadOS 16.4.1 and macOS 13.3.1 in tandem. Such minor updates are typically focused on bug fixes and security improvements.

Article Link: macOS 13.3 and iPadOS 16.4 Users Report Issues With Continuity Features
Uh... I didn't know this was a new problem?
 
I updated my 2018 iPad Pro to 16.4 but didn’t update my M1 Pro MacBook, continuity still works fine for me.

Glad I waited!😮‍💨
 
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