Both screens are not displayed when connecting an external monitor after 10.15.6 upgrade.
Before the upgrade, it worked fine in version 10.15.5.
Is there any solution about this ?
MacBook Pro 16″, macOS 10.15
I just discovered this thread. There is another thread about the same topic, but this seems more active.
I'll state my problem:
Hardware:
MacBook Pro 16"
All external Displays I tried this with (all result in the same Problem):
Adaptor I have this problem with:
Belkin USB-C to VGA adaptor (F2CU037)
This Problem immediately occurred after the update to macOS 10.15.6. I had a display connected right before the update (it was working perfectly) and right after the update (that's when the problem first occurred).
This is a very strong correlation for me. The adaptor works fine with a surface book and all the above mentioned displays, which leads to the conclusion that the problem lies with the macOS update.
When I plug in a Monitor via the adaptor all connected displays and the internal display start to flicker as if they can't properly be detected. This goes into an infinity loop with a flickering pattern (internal display lights up for 1/10 of a second and goes black for 1 second).
I have tried everything mentioned in this thread including rebooting in safe mode, resetting NVRAM and PRAM, etc.
The update to 10.15.7 did not solve the problem.
Of corse I can just buy a new adaptor that supports DP or HDMI (my Belkin HDMI adaptor works just fine) but I think we all agree that this is not acceptable if I spend 6k for a laptop. I have to rely on this adaptor for presentations if there isn't a HDMI available for the projector. So I bought the apple adaptor. But no one can seriously suggest that this is a solution.
Addressing the comments that the adaptor wasn't supporting high speed transmission or a certain resolution or isn't certified. Sorry but this is nonsense. First of all this adaptor worked perfectly fine previous to the update. Second Belkin is a premium brand that supports all standards. Especially with VGA its not a problem of any speed restrictions. With 4k this might be a different story but not VGA.
I will go to an apple store next week, let's see what they have to say. I am really disappointed with apple on this one. I just expect not to bother with something like this.
There may indeed be a problem with support for VGA adapters.
But using Analog VGA to displays is not good move for displays you will be using daily. VGA is an antique.
Digital displays are far better, and very affordable.
I and most likely everyone here is aware that VGA is not a new standard. It is still found on projectors and monitors and I need it fairly often when there is no alternative. Im not talking about my daily setup. But when I need it I have to rely on the adapter to work. Especially when I pay 6k for a laptop and quite a bit for an adapter.
The adaptor works fine with competitors devices as well as other MacBooks.
No one is expecting a machine in 2019 to support VGA natively without an adapter, but if I buy a dedicated adapter from apple I expect it to work.
Suggesting that because of age this is a support problem is just short sighted.
Ever description of this issues leads to the conclusion of a software issue in the 10.15.6. release.
To be honest I don't see your comments helping to resolve this issue in any way.
This is a User-to-User Support Community.
W hen you post that you have checked this against multiple different VGA displays, and all did not work, it leads me think that VGA displays are your preference for daily use, and that is what my reply was about.
If you "'don't see my comments helping to resolve this issue in any way", I invite you to use the Contact Support link at the top of any Forum web page and complain to an Apple employee rather than having a discussion with other Users who sometimes have insights into such issues.
Funny enough, a 'display' profile is added each time you connect an external display. This is a new feature....
Tried safe mode and didn’t make a difference. Tried all the ports on the MacBook to no avail. It sees the monitor and is trying to connect but cannot.
I would tend to agree. It’s very strange for me in that I know the monitor works fine and the computer can recognize that it’s there but it just cannot establish the connection.
Don't expect any fix from Apple any time soon. Customer support with tell you to drop your laptop at a store and come back pick it up in 3 weeks.
Right on, Karen!
You are most welcome Nancy.
Readers here are other Apple Users like you, not Apple employees.
If you would like to work on this, please post the Make&Model of your display and its cables/adapters.
Did you try it is safe Mode? did you get a picture there with the default settings?
This makes sense. I had a usb c to vga so I’m sure the adapter was fairly old.
Good news :-)
Thank you for your reply and I'll.wait for next update hopefully
I had that issue a few times - no magic fix, other than uninstalling and trying again until it was there.
10.15.6, external display problem
