I've got the new MacBook Pro with TouchBar and the new LG 5K monitor. I plug it into the USB port directly (single usb-c port using provided cable).
It looks good but I can't tell if it is really showing 5K. In About/Displays it shows 5K but when I look in the apple display app it looks like it has less resolution then the 4K monitor I have sitting next to it (when I unplug the 4K, the screen resolution does not change even after reboot which I think is to be expected).
My question is, How can I know that my 5K monitor is really working at 5K? is there some kind of 5K test pattern I can look at?
I called apple and they had no idea how to know. Worst support call from apple ever. guy said he had no manager, could not escalate. Told me it's like buying a third party product from Walmart (even though I bought it from the apple store and it was in Tim Cook's keynote)