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If the HDMI port supports 4096x2304, then why won't it support LG Ultrawides @3440x1440? I talked to 2 Apple techs just threw their hands up and told me it's a problem with the monitor but searching around the web, nobody has been able to get this to work without using the usb-c ports. Of course, LG says it's a problem with the mini.
The 2018 Mac Mini supports 4096 x 2160 at 60 Hz via the HDMI port.
Mac mini - Technical Specifications - Apple
What model is your Ultra Wide LG?
Check the marking on your cable, is it HDMI 1.4 or better?
see > https://www.audioholics.com/hdtv-formats/understanding-difference-hdmi-versions
If not, then you need a better quality HDMI 1.4 or 2.0 HDMI cable.
Hmm... the Mac Mini's is up-to-date?
I would try downloading and installing the latest Combo Update over the top of the current stand alone macOS version. The Combo Updates are the latest full macOS update versions and have been know to solve numerous stand alone update issues.
If the Mac Mini is on Mojave, use > https://support.apple.com/kb/DL2010?viewlocale=en_US&locale=en_US
If the Mac Mini is on Catalina, use > https://support.apple.com/kb/DL2028?viewlocale=en_US&locale=en_US
The model of my LG is 34UM95-P. It works perfectly with my 2013 Mac Pro (though I needed to use SwitchRezX when I upgraded to Mojave).
I tried HDMI out to HDMI in directly with several cables, all new 2.0 cables with full 4K support. I tried 2 HDMI to DisplayPort adapters, one from Keezing, one from Benfei. Nothing worked. I ended up getting it to work using an OWC TB3 dock for $300. I'm sure the extra ports will come in handy, but this was the only work-around I could find.
Never assume that, because things change before, during and after they leave the factory.
Besides no harm or data loss will come from installing a Combo Update over the top of a factory install or an earlier stand alone update.
3440x1440 is a non-standard resolution that isn’t part of mandatory HDMI 2.0. Unless and until LG specifically mention it’s tested working with the mini, you should assume otherwise. If you can coax it to work using third party hardware/software great, otherwise contact LG (or not, it’s a known dead end from the get go). Good luck.
Thanks. It's a brand new machine, running on the latest update. I would assume Apple got the install right at the factory.
Well, I'll give it a shot. Thanks for the input.
The 2018 Mini HDMI port does not support 3440x1440 LG Ultrawide monitors
