Blank display on login screen after upgrade to Tahoe 26.2

simona · 01-09-2026, 07:47 AM

I have the same issue M4 Pro, DisplayLinkMgr 15.0.0 after upgrade to Tahoe 26.2 I have to headless login then connection is detected.
Support file sent

Szymon · 01-09-2026, 01:22 PM

Hi simona,

I suspect you have enabled FileVault during an upgrade to Tahoe 26.
Check your macOS Settings -> Privacy & Security -> FileVault. If you intend to use external screen before login, this functionality must remain disabled.

PS. I've moved your message to a dedicated thread as it appears to be a unique problem.

Regards,
Szymon

Brant · Yesterday, 08:52 PM

I also have this issue, where my screens are black at start up. I've had to unplug one HDMI from the hub, and plug it into the M4 HDMI to get it to bring up one screen. BUt when I plug it back into the hub, it flicks back to working as it should. I don't want to have to do this every time I boot up.
Is there another way? Because I'd rather not turn fire vault off, and I also don't want to wear out the HDMI port on my brand new M4.
Thanks!
B.

01-09-2026, 07:47 AM	#1
simona Junior Member Join Date: Jan 2026 Posts: 1	Blank display on login screen after upgrade to Tahoe 26.2 I have the same issue M4 Pro, DisplayLinkMgr 15.0.0 after upgrade to Tahoe 26.2 I have to headless login then connection is detected. Support file sent Last edited by simona; 01-09-2026 at 08:54 AM.

Yesterday, 08:52 PM	#3
Brant Junior Member Join Date: Jan 2026 Posts: 1	Any other way? I also have this issue, where my screens are black at start up. I've had to unplug one HDMI from the hub, and plug it into the M4 HDMI to get it to bring up one screen. BUt when I plug it back into the hub, it flicks back to working as it should. I don't want to have to do this every time I boot up. Is there another way? Because I'd rather not turn fire vault off, and I also don't want to wear out the HDMI port on my brand new M4. Thanks! B.

01-09-2026, 01:22 PM	#2
Szymon DisplayLink Tech Support Join Date: Feb 2010 Posts: 193	Hi simona, I suspect you have enabled FileVault during an upgrade to Tahoe 26. Check your macOS Settings -> Privacy & Security -> FileVault. If you intend to use external screen before login, this functionality must remain disabled. PS. I've moved your message to a dedicated thread as it appears to be a unique problem. Regards, Szymon