Hello,
after upgrading my MacBook to macOS Catalina I can't connect external displays. Minutes before installation it was all properly working. It seems like MacBook doesn't detect them at all.
Anyone has similar issue? Any hints?
The displays are not Apple (HP, Asus).
Maybe this might point you in the right direction.
I fixed my full time pink screen issue, here is the solution. I think it might apply to your issue as well. For those of you without working screens, I suggest finding a screen that does work temporarily, and installing Teamviewer, or some other free program to remotely log into your machine. After doing so, connect the nonworking screen, start the computer, and log in remotely, then follow the steps 1-5 below. you will have to switch back to the working screen for the steps 6-15
The reason it is having an issue, is after the update, the signal being sent is YCbCr instead of RGB like your monitors are expecting. Some people with panels like mine will get pink, others likely get no signal recognized. This script works by setting up a profile for your specific monitor, and having it be forced to be RGB, if you connect it to another model monitor with the same issue, this process will need to be repeated for that monitor as well.
Hope this helps everyone! if you have issues look in the comments on the script page, the author is active.
My machine is a Mac mini (2018) i7 64GB 1TB. My monitor is a 28 inch Hannspree HF289H monitor
This is so frustrating. I have Late 2013 iMac. Dual monitors were never a problem until I upgraded to Catalina. Every time Mac does an update the 2nd monitor stops working. It has taken 1 minute to 1 hour each time playing around to get the second monitor working.
This time, nothing seems to work. Mac boots up, 2nd monitor shows Acer on screen, mac then changes resolution to be that of the Acer (never did that before) then Acer goes to no signal. Connecting via firewire to HDMI (no software required).
At first I thought it was the Mac a few months ago and tried to buy a brand new Mac. Fruitless effort, with next day delivery gave up after a month of no delivery. Tried again, after two weeks gave up again and built myself a Linux Mint box (no problem with dual monitors). Need Adobe so bit the bullet and purchased a W10 machine (probably going to **** for it, I really hate W10).
I guess Mac just does not want me to be a customer any longer. My main phone is a Pixel but I have an iPhone so when people call and need help with their iPhone I can look at it and help them. I guess I might as well give it away as I am going to learn how to use Gimp and good riddance to the dual monitor problem and Apple as a company!
Or Apple, fix the dual monitor problem once and for all!
That is not the actual adapter I am using, I was just replying to someone saying they never heard of it.
The adapter I have is of better quality.
The dual monitor has been working great for several months. It is not working today and when I go to settings some of the icons in settings are different (new and improved images) so some sort of update took place.
Acer® KA270H Abix 27" Full-HD LED Monitor, Ultra-Thin Bezel, VESA® Mount, UM.HX0AA.A06
Reading through this thread, this seems to be an ongoing and we don't care problem for Apple.
this is a SUPER late response, but I just upgraded to Big Sur from Mojave and now have this issue. I found the location for “screen recording” but I don’t see DisplayLinkuserAgent anywhere. Is that something that needs to be downloaded?
Direct cable. HDMI to USB C. I tried with Detect Display and no result.
Hi Luis, I had the same problem after upgraded to Catalina, as you mentioned above, where is the Detect Displays.
Yes, I just upgraded and now my dual monitor set up no longer works. One connected via HDMI works but other connected via USB-C does not. so frustrating. Why do I upgrade ... I should know better!
HOW THE @#$% AM I SUPPOSED TO DO THAT IF MY MONITOR DOESN'T WORK?!
Yes, that button comes on when you play with the option button.. Then you click it and nothing happens.
I have a macbook air, early 2015. New catalina last night
I can see the external screen only in safe mood.
I would actually try your recommendation if my monitors had a VGA connection. I have two 32" HP Pavilions and they don't have VGA ports.
Update: tinkering with energy savings settings did not resolve the issue.
Same issue. Tried opening display settings and have no options. Tried holding down option did not get a detect displays button at all.
Hi, when i click the option key the detect displays button appears , but flickers on/off. i try to press it down and nothing happens. Can you help me with that?
.
Luis, do you have a recommendation for a cable that will definitely work when connecting an HDMI monitor to a USB-C port?
External display not working after installing MacOs Catalina
