External Monitor Issue After macOS Sequoia 15.1.1 Update

Updated to 15.2 with fingers crossed and no luck still the same issue. External monitor comes on for a sec and then blank screen. No change with this update. Apple please fix this!! This is not just a little bug this is destroying a lot of peoples daily workflow. :(

The 15.2 update did not fix this issue for me. I only accepted the 15.1.1 update because I had a different issue related to iCloud synchronization of contact labels and Apple support insisted that I update to Sequoia. Now I have a new issue with my monitor while my original contact synch issue remains unresolved as well. Super cool!

Sequoia has washed out my colors. They are so light, that anything white isn’t invisible including boxes that need to be checked. I can do a search for white underwear and barely see anything. My MacBook Air is 2022 so I got a new M3 for Christmas same thing! So disappointed in Apple. I been a Mac user for 20 years.

clarka117 wrote:

Sequoia has washed out my colors. They are so light, that anything white isn’t invisible including boxes that need to be checked. I can do a search for white underwear and barely see anything. My MacBook Air is 2022 so I got a new M3 for Christmas same thing! So disappointed in Apple. I been a Mac user for 20 years.

Is this on the internal display or external? If it is on the internal display, then your problem is completely different from what is being discussed in this thread. You should start a new thread and give details about your system, including an Etrecheck report. FWIW, I do NOT see these washed out colors in any of three macs running Sequoia (one Intel, one M1 and one M4 Pro), and this is the first I have heard of this. The fact that it happens in two macs of yours suggests that you may have migrated whatever was causing the problem from old to new.

Same problem here. Sequoia 15.2. Went straight to Sequoia 15.2 from Sonoma, which was working fine.

Three Dell U3223QE displays connected to M1 Max Mac Studio, all via USB-C to USB-C. Two of the displays are fine. The third exhibits the problem described here. Sometimes the screen goes black every few minutes. Sometimes it's stable for many hours. Windows never move positions and it is always restored within a few seconds. Not a showstopper, but definitely a consistent workflow annoyance.

Data point- no issues here.

2019 Intel MBP with UtechSmart USB-C dock to Samsung HDMI display.

M1 mini with LG UltraFine Thunderbolt display and Dell HDMI display

M3 MacBook Air with LG UltraFine Thunderbolt display

All running Sequoia 15.2, all working perfectly.

Come on!!!!!!! This is SO frustrating.

• I've tried all suggestions, nothing works! Details of the issue:
• 14-inch Macbook Pro M1 2021 (Macbook 18,3) on Sequoia 15.2 no longer recognizes external display (Brand: HGFRTEE) that worked just fine on Sonoma.
• Using USB-C ports. Have tried all ports, none work with this monitor; all of them work with another monitor; the monitor works fine in all USB-C ports when using my other 14-inch Macbook Pro M1 2021 (Macbook 18,3) on Sequoia 15.2 (identical model and version).
• For some reason, my Macbook recognizes the display instead as a sound output, named DPAudio.
• The monitor doesn't say "No signal detected"; instead, it shows a black image, but the Macbook doesn't detect the display. Alt + Detect displays does nothing.

When are we getting a fix? This is just awful!!!

Thank you for sharing that thread and the fix! This finally fixed it for me. My workaround was using a dongle and connecting via HDMI (for display and USBC just for power) instead of USB-C only (how it used to work). Now I don't need the dongle and HDMI cable anymore. Question is, why can't apple patch this? 🤦‍♂️

Same issue here too. Macbook Air M1.

External Pen display, Huion Kamvas Pro 24. Just switched off and on again as I'm writing this.

Driving me crazy! and started the moment I upgraded to 15.2 last night.

Really shocking that these kind of issues are allowed to persist.

Trillion dollar company and shoddy, untested updates. Classic.

Just updated to Sequoia 15.3 (about 30 minutes ago) and the same problem, described above, just occurred again. Was writing an email and while I was typing, my computer went to sleep and i had to log back in to get back to work.

I don't know but that seems to be a really big bug to just let pass like that for all this time (I mean Sequoia 15.1 is out since October last year !

Same here. I waited 4 generations to make sure I get a product that has virtually no catastrophic problems like this. Seeing how this thread is flat out ignored, it is not too hard to determine Apple is more concerned with looks than usability. I took mine straight back to the store for a refund less than 24 hours after I bought it. Spent over a thousand dollars on it. Downloaded and installed irreversible system update and my left monitor stopped working.

Remember when the company was run by a visionary man who cared about user experience? Yeah... me too.

I have a MacBook Pro 14" (November 2023, M3). After updating to the latest macOS Sequoia, it was working fine until I connected it to my Samsung monitor via HDMI. The computer restarted on its own and then completely shut down. Since then, it has been unresponsive—no signs of power, and the charging cable does not light up at all.

It is dead.

Thanks for the input, Luis, but your statement has a few glaring logical failures. "But, since it does not affect everyone and, in fact, it seems to affect only a minority of users..." While almost certainly true that not "everyone" is affected, to follow that with "in fact" is problematic, as you then identify that this problem affects "a minority of users;" but how do you know that to be true? Are you basing that on this discussion? If so, then wouldn't you need to know how representative this group is of the population of users to determine a "minority?" Since this is a self-selecting group you cannot infer anything about the representativeness of this sample compared to either the sampling frame or the population (quite the opposite; this group is likely very unrepresentative of the larger population). Further, you stated that "it seems futile to expect that a software update will fix it." Really? So you're assuming that a computer company does not fix bugs? What is that statement based on? My point here is that this thread is ongoing to try to figure out the issue and hopefully get Apple to fix it. Adding jump-to-conclusion offerings that breakdown into logical fallacies immediately is no help at all.

@AppleSince_85 - nice name! I too started using Apple in 1985, by the way.

I am not diminishing the trouble that this problem causes to all those affected.

Debating what is and is not representative is futile, so let's just agree to disagree on that - neither of us has data to formally claim, one way or the other, it is a matter of point of view, so I retract the "in fact" comment.

I hope that it gets resolved, and sooner rather than later.

Thanks Teichfrosch, I ordered that cable and will report. It seems to be similar to my UNI cable (I bought it in 2020). Same price, but might be a newer generation.

Yesterday I got another hub type adapter (the forth one), it seems to work too. But I would prefer an adapter cable.