MacOS 13.4 Ventura - External Monitor no longer detected. Worked until the update to 13.4

i got it working again by doing this:

delete ~/Library/Preferences/ByHost/com.apple.windowserver.display.{XXXX{.plist and restart

I just tried that and it didnt work. So annoying. Shouldve just left it as OS X 13 because everytime you update sh*t like this happens. Ridiculous Apple!

For the record. I have a M1 Macbook Air connected via USBC to a LG 4k USBC port

Same here. I updated to 13.4 last night and now my Mac Mini M2 won't connect to my ASUS Pro Art monitor via USB-C. It does recognise it via HDMI.

I just confirmed my MacBook Air M2 (OSX10.31a) works fine but when my M1 Macbook Air OSX 13.4 is connected to same setup the extended doesnt work. The monitor works but one I swipe screens it swipes both on the laptop and 27inch while in Extended Display mode.

divinetruth wrote:

I just confirmed my MacBook Air M2 (OSX10.31a) works fine but when my M1 Macbook Air OSX 13.4 is connected to same setup the extended doesnt work. The monitor works but one I swipe screens it swipes both on the laptop and 27inch while in Extended Display mode.

What does mean? One swipe screen? Can you explain?

When I use 3 fingers on the trackpad it changes to my other desktops ( I have many open) e.g fullscreen Mail, next screen could be Safari pages etc.

Now when I swipe on say one screen (Macbook) then the extended screen is also changing at the same time (usually just showing a blank screen) and vica versa on the 27inch screen its connect too.

In System Settings->Desktop & Dock, under Mission Control, make sure that “Displays have separate Spaces” is CHECKED. Logout and login again to activate this feature, and the problem should be solved.

This:

Thank you so much as that toggle switch was turned off after the update from 13.0 to 13.4

Appreciate the time taken to answer my problem. thanks

Thanks, worked for me :)

I have a Dell U4919DW that completely stopped working altogether after updating to 13.4, at least with the USB-C cable. I also have an Apple Studio Display, and that actually still works.

would love a fix for this asap Apple 😎

or some kind of workaround

This did the trick perfectly!!!! Thank you

I have a similar issue after upgrading to Ventura 13.4. I'm connecting my M2 laptop to an external display using USBC. The display works fine but the peripherals (keyboard and mouse) connected (with USB) to display stopped working after the upgrade. Before the upgrade, they all were working fine.

Anyone has an idea as to how to fix it?

I am using Mac Studio M1 and I had the same issue after updating to the latest MacOS Ventura 13.4.

My monitor setup: 2x Benq monitors. One connected via HDMI and one via USB-C. USB-C connection is affected.

I tried this and it worked for me.

1. Disconnect the USB-C monitor from either the monitor or Mac. Keep the HDMI monitor on.
2. Go to System Setting.
3. Go to Display.
4. Select any other resolutions. Return to your preferred resolution.
5. Re-connect the USB-C to the monitor.

This worked for me.

If you only have one monitor, I guess you have to try other connection/options. I know that HDMI works in this update.

Currently known issue: When web browser is in full screen in either monitor, the other monitor is blacked out. I think this is still unresolved. I do not know how to feedback to Apple and I don't have time for that. Hope Apple can patch it up soon.

Best Regards.

IG: nehpyh