I just got a new monitor: an Acer B276HUL. Its native resolution is 2560×1440. I didn't do my research before ordering it; that resolution is too high for single-link DVI! So I have yet to see it operate in its native resolution. But I'd like to try it.
I have a Mac Pro laptop, and a Monoprice adaptor for mini-DisplayPort to DVI, HDMI, or DisplayPort. And the monitor came with a DisplayPort cable. So I tried to connect the monitor to the Mac using DisplayPort. The Mac did not recognize the monitor.
When I use the DVI adapter and plug in the cable, the Mac recognizes the monitor: if I have the System Settings open to Displays, then when I plug in the cable, settings for multiple monitors appear. When I unplug the cable, those settings disappear. But when I unplug the DVI cable from the adapter, and plug in the DisplayPort cable, the Mac does not react to the adapter plugging and unplugging.
I have gone into the menu on the monitor and set it to "Input: DisplayPort" before trying the above experiment. No success.
I found a discussion page that suggested restarting the Mac in "Safe" mode, and I tried that. It didn't help; the monitor was not recognized.
https://discussions.apple.com/message/22842241#22842241
Isn't a mini-DisplayPort to DisplayPort adapter just an electrical pass-through? So, shouldn't this trivially work?
Is there a chance that it would work if I got a simple adapter that only does mini-DisplayPort to DisplayPort?
If I were to buy an Apple branded mini-DisplayPort to DisplayPort adapter, is that likely to make any difference?
Best Answer
After much fscking around I came up with a solution, I think. At least it's working for me.
On Monitor OSD:
You might have to plug into a source that works in order to use the OSD, I had to plugin an HDMI source before it would let me do anything.
This should get you an image at 2560x1440.
If it's jaggedy and terrible looking try pasting the following xml and rebooting:
/System/Library/Displays/Overrides/DisplayVendorID-472/DisplayProductID-361
Original comment: