TB3 Cable + Ext. Display Not Recognized in Sys. Information, No Video Output from Thunderbolt-Connected External Display (M1 MBP w/ Sonoma to Asus ProArt PA32UC)

I am using a high quality TB3-to-TB3 CableMatters cable, which I have successfully connected my MacBook Pro with in the past w/ this specific monitor. I did use a couple of other Thunderbolt-based cables I have with a couple of different MBP ports, a couple different Asus PA TB Ports.


I haven't had much luck looking through my console's log for any glaring issues. Especially because I must wade through tons of "Family"-related errors that many have been experiencing.


This happens to be one of the few I latched onto/recognized as relevant to my issue.


[UARPAppleHPM doAtomic4CC:data:dataLength:extData:dataOut:dataOutLength:dataOutLengthRead:extDataOut:error:]: 4cc operation failed <0x08>, iteration 0. <private>


The TB Port information does change *very* slightly when I connect the monitor, and it does charge my MBP. It'll go from 0x100 (Link Status) & 0x1 (Link Width) to –> 0x1:0x0. If I refresh the information, sometimes it'll show an LS of 0x7 instead.


Also, I have been having odd issues with the clock accuracy or my location services. Basically whenever I start/return from hibernation, my Macbook shows the time as if I am in MST or PST (can't remember off the top of my head) whereas I am in EST. Outside of restarts, I have even tried sudo nvram -c with no luck.


Unsure if these are related. But I wouldn't be surprised if this is all one interrelated issue in the privacy/file ownership realm because another recent issue, that randomly resolved itself, was my MBP wasn't recognizing my previously connected MIDI Keyboard correctly.


Thanks for any help!

MacBook Pro (M1, 2020)

Posted on Aug 14, 2023 4:27 PM

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Posted on Aug 14, 2023 7:35 PM

Bagggh. That must be the issue! I had moved and this new setup needs a longer cable. Only have 1 puny <0.5m TB cable and it worked right away. Feel like a dunce for posting this, especially after wasting so much time scouring for errors in my console.


Thanks for the clarification. Looks like I'll have to figure something else out.

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Question marked as Top-ranking reply

Aug 14, 2023 7:35 PM in response to Grant Bennet-Alder

Bagggh. That must be the issue! I had moved and this new setup needs a longer cable. Only have 1 puny <0.5m TB cable and it worked right away. Feel like a dunce for posting this, especially after wasting so much time scouring for errors in my console.


Thanks for the clarification. Looks like I'll have to figure something else out.

Aug 14, 2023 4:35 PM in response to zakattack423

<< I am using a high quality TB3-to-TB3 CableMatters cable >>


Connecting 4K display over Thunderbolt requires an Apple cable cable 0.8 meters maximum length, or 0.5 meters maximum for non-Apple cables.


¿does that correctly describe your cable?


if not, later versions of MacOS are MUCH more sensitive to any errors generated, and will either reduce the resolution or fail to provide a picture.

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TB3 Cable + Ext. Display Not Recognized in Sys. Information, No Video Output from Thunderbolt-Connected External Display (M1 MBP w/ Sonoma to Asus ProArt PA32UC)

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