External Display USB-c Monitor issue

Well, let's assume Apple doesn't know about this issue. We need to inform Apple about it. We need a bunch of requests to Apple Support on this issue with the link to this discussion. I've already done this a couple of months ago. But we need to bombard Apple with this kind of requests.

When waking up, my Macbook recognize my QHD display (connected via USB-C to USB-c) as a 1080p display. This happens sometimes, it may not happen for a week and the appear again. My solution for the time is plug it and unplug it until it recognize it correctly (it may involve 10 or 20 unplugs).

This issue was not present in MacOs Catalina, so its a Big Sur bug.

The issue is still here on update 11.2.3. Will not wake up a LG UltraFine Display 21.5 inch that Apple sold me, and that had worked in the previous OS. Rez still wrong. Same LG 38" curved display. What happened Apple going backwards. This is the same situation with BenQ and a lot of Hi Rez monitors. They had this all worked out in previous OS versions! What's up????

I have MBP16 and the same issue. Before Big Sur it was OK. So it's obviously a software issue.

I can confirm (after early testing) that USB-C to DP is working and the display will wake. I'm doing it via USB-C -> CalDigit TS3+ -> DP 1.2 on a Dell U2719DC

yvanrrrr wrote: "Is there anyone from Apple reading this thread?!"

Perhaps, but Apple will certainly read your feedback here:

macOS Feedback

And you can also Get Support from Apple.

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Is is possible to get Apple Tech involved and actually escalate this and solve this issue? I am running 2xc LG 34" and 27" monitors that Cost me 1500$ and they are both displaying very bad text quality, colors are off. I had this issue fixed previously in Catalina, now the "fix" using the ruby code stopped working.

It really is beyond comprehension that so many of us are experiencing this and Apple have said or done nothing since point one was released and did this to our expensive monitors.

Apple are you hearing us???

Interesting that a new machine doesn’t have the external monitor issues. I suppose I’ll try an exchange with my M1 MacBook Pro as well. I’m at my wits end and will be selling it and getting something else if this isn’t fixed soon.

That is very disappointing news.. Even more so, as I believe, it is a statement that Apple doesn't care. Obviously their M1 line is doing well and they will have many new acquisitions because of it. So the support of their flagship 16" MacBook Pro line is down in the drains as their focus has shifted. This is very, very disappointing for me. Luckily my Macbook is still under warranty, so I will be diligently considering going to the local distributor and throwing it back to Apple to get a refund. I was very much hopeful that 11.2 would fix all problems with external screens.

That's pretty ridiculous if true. I'm currently using a Thunderbolt dock that Apple sells online. It only has USB-C and DisplayPort for monitor inputs. So now I've got to go from HDMI > DVI > USB-C on my dock and hope that it works?? Yikes.

Guess I'll try HDMI > USB-C first and report back.

For context USB-C to USB-C directly from my monitor also doesn't work properly.

Hi @alan7467,

I find that confusing as well. Apple support did also note that USB-C directly is NOT supported either.

I have not been able to find USB-C to DVI cable that takes the input from dvi and outputs to usb-c. Please let me know if you find one that does that.

I have two of those, and they are actually Thunderbolt displays that do also accept USB-C input. However, I don't believe Macs output actual USB-C signals from their Thunderbolt ports, so while the form-factor is compatible, the signaling is not.

@alan7467 Could you provide a link to the cable, or the model and brand? I'm interested in trying it out as well. I have not been able to find a single cable that is HDMI to USB-C, they are all uni-directional USB-C to HDMI.