M1 Mac Mini + USB-C Monitor Issues

Direct USB-C to USB-C for monitor to Macs doesn’t work very well because monitors are clueless on what’s connected, a power-hungry laptop or power rebuffing desktop. I would connect the monitor’s USB C to the mini’s USB-A port using suitable C-A adapter/cable to enable hub functions. For video, use HDMI-HDMI with a cable not longer than 5’. Good luck!

I have a similar issue using a Dell U2722DE monitor where the USB C works fine for several weeks and suddenly will drop the display signal. The other built in hub connected devices continue to work without issue. I have have swapped like displays and get the same result, and swapped out USB C cables without success. Odd that it works for an extended time and suddenly drops the display signal. Interestingly the display also has a detachable speaker and the M1 Mac Mini sometimes connects and other times it does not even though it is showing up in the Stem preference panel.

So it is not unique to your system, and it will be interesting to see how many more run into this problem.

Wake issues are unrelated. As for the rest, it is what it is, even if it takes several months to manifest itself. Follow the workaround before your mini’s USB C port goes completely dead! A do-all single cable isn’t worth it; best to separate video and data. All the best.

Ah, less informed for sure. Both monitors are working just fine with the Surface laptop using a USB C cable. Here is the USB C specification in case you would like to improve your knowledge: https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%20R2.0%20-%20August%202019_0.pdf

Also feel free to check out the M1 Mini specification that clearly indicates the USB C capability to support a monitor. So yes, it is defective.

Cheers

Direct USB-C to USB-C for monitor to Macs doesn’t work very well because monitors are clueless on what’s connected, a power-hungry laptop or power rebuffing desktop. I would connect the monitor’s USB C to the mini’s USB-A port using suitable C-A adapter/cable to enable hub functions. For video, use HDMI-HDMI with a cable not longer than 5’. Good luck!

Interesting, not sure your feedback is qualified given it worked solidly for several months without issue. Noted there are many other posts related monitor issues at some kind of wake. Some dual monitors, others single, with HDMI and USB C.

A defect is a defect. Yes, a workaround is changing over to HDMI, yet use of a USB C cable to drive a display is commonplace and reliable on many computers. Plus, the point is to support video and data simultaneously. Standards are developed and used across the industry to ensure uniformity. It’s clear the in this case that the M1 Mini has a defect in implementing the standard. Advice to just live with it is tosh.

Surface n/a to Apple and the nothing in the spec mandates monitors to pump power out clueless if it’s needed or not. At any rate, you’re free to file a report https://support.apple.com/en-us/HT201232 or feed it back https://www.apple.com/feedback/. Good luck!

Nope, it’s for the monitor to detect if the attaching device needs power and supply it intelligently. Contact your monitor manufacturer for fixing. Good luck!