I just bought the LG 29UM58 21:9. My computer is a Mac Mini late 2012 (i7 model) running OS X 10.11
The display preferences just shows 1920x1080 16:9 than then is stretched out to 2560x1080 21:9.
SwitchResX software doesn't work? (Crashes? Runs but doesn't offer other resolution choices?)
I use a Thunderbolt to HDMI adapter.
How can I configure better resolution choices (ideally 2560 X 1080) for my setup?