Since the last update (21A5534d), my MacBook doesn't detect my 2nd display. I've tried swapping the display with a new one and trying different connection methods. My MacBook's built-in display goes black for a moment when I attach the cable, but nothing else happens.
I seem to remember that the System Preferences > Displays used to have an option for manually detecting a display, but it doesn't appear to be there any more.
I hope I'm not the only person experiencing this.
I have 2021 MBP 14" M1 Pro with two 32" LG displays connected via USB-C. Here is what you need to do:
Cheers, Juha
2020 MB Pro and Dell32x Monitor, same issue. Following.
Same issue with macbook pro 2020 and asus monitor. Very disappointing.
Same problem. AppleCare acted like they had NO IDEA of this issue. I have a dual-boot with windows loaded. The problem is not happening in Windows. This AMAZES me. I was pretty certain that it is/was a hardware issue but now I am a believer that it's a software issue.
I'm on hold calling Apple back to point them to this forum.
I have the same exact issue with my M1 Macbook Air and HP z27 monitor. EVEN MORE ANNOYING the built in hub works fine and I can use the keyboard and mouse PLUGGED INTO THE MONITOR, but can't get the monitor itself to detect. The MacOS developers stupidly also made the "detect displays" feature previously available by holding option on the displays system preferences NOT AVAILABLE unless you have an already detected monitor installed. What level of idiocy are they allowing over there at Apple these days?
Same problems here. On the first day, second display (connected through Thunderbolt 4 USB-C) worked without issues. Second day the problems started... eventually through this forum caught the "disconnecting display from power" workaround and it solved it. Now, day 3, I've tried every trick in the internet and just cannot get the 2nd display to work. If I move the display from the USB-C directly to HDMI, it works immediately. Come on, Apple!!
Hello everyone,
I had similar issues and recognized that it might be related to the DisplayPort Alt Mode. I came across this because because MonitorControl (https://github.com/MonitorControl/MonitorControl) only works with native DDC (protocol to control backgroundlighting, sound, etc. on monitors) with cables and adapters that use DisplayPort Alt Mode.
I have three different cables / connectors that I tried over the time (from May 2021 when I I got my M1 MBA to now) with my Dell S2712QS. My goal was to get 4K@60 Hz with native working DDC working all the same time. I also tried USB-C to DisplayPort adapters but unfortunately my Dell doesn't like 4K@60 Hz over DisplayPort (https://www.dell.com/community/Monitors/S2721QS-black-screen-for-1-2-seconds-random-5/td-p/7908482) , so I pivoted to HDMI.
Here are my results: i-tec C31VGAHDMIADA + some random HDMI cable
Delock (84905) USB-C to HDMI cable (https://www.delock.de/produkte/G_84905/merkmale.html?setLanguage=en)
Inline 64112 USB-C to HDMI cable
I hope somebody finds this useful.
Cheers
I also started having this problem yesterday all of a sudden. My setup is this:
This has worked without any problem since I got the laptop in november. Yesterday it stopped working.
I have tried a lot of things mentioned in this thread but nothing worked for me. I have as a quick fix replaced my thunderbolt cable connection with a DisplayPort (from the monitor) to usb-c cable (connected to my macbook). This works but it also means I need to connect the apple magsafe cable to charge the macbook.
Please apple, fix this!
I'm having the exact same problem, I just bought a new HP V22 monitor however it just never can connect to my Macbook Pro. It is very frustrating and disappointing. @apple please fix the problem!
Same problem here with a Dell monitor - it worked fine before updating my OS, which I knew was a mistake.
I'm using a Mac Mini, dual BenQ monitors, connected via usb-c and running the latest public beta update broke dual displays (21E5196i). I tried the suggestions with power and such, nothing worked. I tried different USB-C ports, and discovered that only one port is working for video. I have a Caldigit ts3 connected to another usb-c port, it works, but video does not through that device.
No change on 12.3 Beta (21E5206e)
I have the same problem. iMac on Monterrey (2017) and MacBook (2020) on big sur.
ucb-C thunderbolt 3 connector between the two does not work. Called apple and was told that this is a known issues with the latest (post 2016) iMacs. And that it’s due to the newer software. No known fix that they’re aware of.
Very frustrating considering the ucb-c thunderbolt 3 was advertised as compatible which I took to mean that it would do its job and allow for dual monitor use between iMac-MAcBook pro.
selling the iMac at this point.
Happened to me too. Second monitor was working fine on Monterey and Macbook Pro M1 2021 then one morning would not detect secondary monitor (Acer 32inch 4k) via USB-C. Worked fine via HDMI. Tried lots of things and lost 2 hours. Then at the end reseting NVRAM/PRAM worked: https://purplecomputing.com/tech-how-to/how-to-reset-nvram-or-pram/#:~:text=Shut%20down%20your%20Mac%2C%20then,Mac%20might%20appear%20to%20restart.
Before resetting NVRAM/PRAM I upgraded from Monterey 12.1 to 12.2.1. Also ordered 1 new USB-C to DP cable :/ since I did not know what else to do. Looks like lost $40.
Hope you make it work, since it is really frustrating that such a basic thing does not work. C'mon Apple engineers.
This worked for me: unplugged power from USB hub.
Deets: Worked fine on Monterey until update on 2021-02-14. Monitor is connected to MacBook Pro via hdmi through USB hub to Thunderbolt 3 port. None of the other solutions cited worked for me.