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Anyone know what this is all about? I am using Mac Mini M1 with Dell 3008 WFP monitor. I actually have two of these and it it does it with both. Can only use one at a time though as cannot find a way to get these both working at the same time. Connection is via thunderbolt to DP
Mac mini, macOS 11.6
The M1 Silicone Mac Mini only supports one display from a USB-C port and one display from the HDMI port.
see > https://support.apple.com/guide/mac-mini/connect-a-display-apd8e4fbbb97/mac
Connect one Dell 3008WFP up to one of the Mac Mini's USB-C ports using a USB-C to DisplayPort cable.
(the Dell supplied cable, may need to be replaced with a better quality USB-C to DisplayPort cable)
Connect the second Dell 3008WFP up to the Mac Mini's HDMI port using a premium certified HDMI cable.
(the Dell supplied HDMI cable, may also need to be replaced by a quality premium certified HDMI cable)
The M1 Silicone Mac Mini only supports one display from a USB-C port and one display from the HDMI port.
see > https://support.apple.com/guide/mac-mini/connect-a-display-apd8e4fbbb97/mac
Connect one Dell 3008WFP up to one of the Mac Mini's USB-C ports using a USB-C to DisplayPort cable.
(the Dell supplied cable, may need to be replaced with a better quality USB-C to DisplayPort cable)
Connect the second Dell 3008WFP up to the Mac Mini's HDMI port using a premium certified HDMI cable.
(the Dell supplied HDMI cable, may also need to be replaced by a quality premium certified HDMI cable)
Cheap cables will not do.
Using a premium certified HDMI cable and a high quality USB-C to DisplayPort 1.4 cable are proven to fix a multitude of display problems including resolution and sleep/wake issues.
Also test the setup with the screensaver disabled and only let the displays turn off by the timer.
Thanks for the info on the cables etc, I am aware of this but still struggling to find a cable that works from HDMI out side of things.
Cables aside, the resolution issue is more my issue right now. When I start using the Mac mini in the morning I have 2560 x 1600. After the OS switches to screen saver after 20 mins the resolution switches to 1920 x 1200..... This has me stumped
Noted about the cheap cables comment, I paid $40 for the cable but not sure what price you think it should be.
I will continue to explore the HDMI cables but the last one I got was $70 but this terminated in DP and I believe I can only have one DP connection at a time on the new M1 chip.
I don't believe the old Dell monitor will allow HDMI 2.0 so the resolution I am after would appear to be unavailable via HDMI.
The monitor does have DVI-D capability which I thought might give me some options but still exploring this as well
mac os 11.6.3 keeps resetting the display resolution from 2560 x 1600 to 1920 x 1200.
