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TimMcDaniel · 04-19-2025, 01:31 PM

Mac Studio M1 Ultra, max RAM, OS 15.4.
DisplayLink 1.10
DL providing signal to Projector.
HDMI providing signal to VX-1000 processor for LED Wall.
Thunderbolt providing signal to external Dell monitor.
Everything is great.

Update OS to 15.4.1.
On restart, the 3 displays seem to be in a fight over who gets to be main display.
I’m not familiar with DL Manager, but I notice the three options - Mirror, Extend, or the middle option, to assign display to an app. I don’t know what that does, so I choose it for the HDMI.
The Mac stops seeing the HDMI display. It does not appear in Settings. Nothing brings it back. (I followed Apple’s directions on booting into safe mode on a silicon Mac multiple times, but have been unsuccessful in that.)
HDMI simply wasn’t there.

Except it was! The VX-1000 processor recognized that I was sending it an HDMI signal, even though the Mac couldn’t see HDMI.
And when I rebooted, the HDMI would act as Main Display…until I logged in, when it would disappear again.
But HDMI remained unavailable.

Finally, I uninstalled DL, using the uninstall app, and installed DL 1.12.1. Still no bueno.
So I uninstalled DL again. This time, there was no uninstall app. (?) But I deleted the app and restarted.

That worked. HDMI returned. Of course, now I didn’t have access to my Projector. So I reinstalled 1.12.1 again.

Current status: if I enable the Projector, I lose HDMI. If I disable the projector, HDMI is good.

I need them both to work. Help, please?

04-19-2025, 01:31 PM	#1
TimMcDaniel Junior Member Join Date: Apr 2025 Posts: 1	DisplayLink fighting with HDMI Mac Studio M1 Ultra, max RAM, OS 15.4. DisplayLink 1.10 DL providing signal to Projector. HDMI providing signal to VX-1000 processor for LED Wall. Thunderbolt providing signal to external Dell monitor. Everything is great. Update OS to 15.4.1. On restart, the 3 displays seem to be in a fight over who gets to be main display. I’m not familiar with DL Manager, but I notice the three options - Mirror, Extend, or the middle option, to assign display to an app. I don’t know what that does, so I choose it for the HDMI. The Mac stops seeing the HDMI display. It does not appear in Settings. Nothing brings it back. (I followed Apple’s directions on booting into safe mode on a silicon Mac multiple times, but have been unsuccessful in that.) HDMI simply wasn’t there. Except it was! The VX-1000 processor recognized that I was sending it an HDMI signal, even though the Mac couldn’t see HDMI. And when I rebooted, the HDMI would act as Main Display…until I logged in, when it would disappear again. But HDMI remained unavailable. Finally, I uninstalled DL, using the uninstall app, and installed DL 1.12.1. Still no bueno. So I uninstalled DL again. This time, there was no uninstall app. (?) But I deleted the app and restarted. That worked. HDMI returned. Of course, now I didn’t have access to my Projector. So I reinstalled 1.12.1 again. Current status: if I enable the Projector, I lose HDMI. If I disable the projector, HDMI is good. I need them both to work. Help, please?