M1 Mac mini: Monitor blanks, password locks after 3 min

Normal login works fine. But if don't login within 3 minutes, my ViewSonic monitor is blank. To get the display to not be black I have to hit space bar multiple times and return multiple times. Then it says "your password is locked for one minute". This isn't a terrible issue, just an irritation.

M1 mac mini running Tahoe 26.4.1.

ViewSonic monitor connected to mac mini via usb-c to HDMI cable.

Earlier Mac models

Posted on Apr 10, 2026 5:40 AM

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13 replies

Apr 10, 2026 12:15 PM in response to cam30era

Try the following:


1 - go to System Settings ➙ Users & Groups and set your user account to automatically log in (without password).


2 - go to System Settings ➙ Energy and turn on "Prevent automatic sleeping when monitor if off".

3 - go to System Settings ➙ Lock Screen and set the settings to what you see in this screenshot (you can use whatever time you'd like in the first item):



4 - go to System Settings ➙ Screensaver, click on Screensaver button and set the time to start the screensaver to whatever time you need:





Apr 10, 2026 7:19 AM in response to cam30era

Please provide more detailed information about your monitors and cables.


What model is the ViewSonic monitor..?

Are you using high speed USB-C to HDMI and HDMI cables..?

What make and model is the monitor connected to the Mac mini's HDMI port..?

Have you tried the ViewSonic connected to the HDMI port and the other monitor on the USB-C to HDMI cable..?

Apr 10, 2026 7:51 AM in response to den.thed

ViewSonic - XG Gaming XG3220 32" LED 4K UHD FreeSync Monitor with HDR (DisplayPort, HDMI, USB)


I apologize. It's an HDMI cable. > Ubluker 10K 8K 4K HDMI Cable 48Gbps 6.6 FT, Certified Ultra High Speed HDMI® Cable 4K 240Hz 144Hz 120Hz 8K60Hz 0.01ms HDR10+ eARC HDCP2.3


RE: your question about what else I've connected it to. I previously had a Dell mini tower PC connected to this same monitor and cable. No problem on that PC.

As I've said previously, this isn't really a problem. Maybe once/month I leave the room before attempting to login.


M1 Mac mini: Monitor blanks, password locks after 3 min

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