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1440p with HDMI to Displayport cable

W

willyx

macrumors regular
Original poster
Apr 25, 2014
164
797
Hello all,

I was wondering if it would be possible to output 1440p from the Macbook 12'' with the Apple HDMI hub and an HDMI to DisplayPort cable

The reason is that my monitor (Dell U2711) can only display 1440p through the DisplayPort, not possible with the HDMI one.

Thank you very much for your help!
 
willyx said:
Hello all,

I was wondering if it would be possible to output 1440p from the Macbook 12'' with the Apple HDMI hub and an HDMI to DisplayPort cable

The reason is that my monitor (Dell U2711) can only display 1440p through the DisplayPort, not possible with the HDMI one.

Thank you very much for your help!
Click to expand...
Same problem for me also with a dell 2515 and I couldn't find a legitimate answer. However I think it's not possible to get 1440p 60hz with the new MacBook Pro on DisplayPort.
 
very frustrating that HDMI sucks and display port does not work. I have almost tried everything.

The only thing that works reliably is HDMI out via the apple dongle, but with that, 1440p will only run at 50Hz, so some flicker. To run at 60Hz, the resolution goes down to 1080p. I believe the limitation is HDMI itself.
 
how well does your macbook 12" work with your monitor?

im thinking to buy rmb, but i just saw this/your post. I have u2515h monitor which is also 2560x1440.

Edit. Apple says that their own usb-c av dongle supports only 1080p/60Hz.

This adapter allows you to mirror your MacBook display to your HDMI-enabled TV or display in up to 1080p at 60Hz or UHD (3840x2160) at 30Hz.
 
willyx said:
Hello all,

I was wondering if it would be possible to output 1440p from the Macbook 12'' with the Apple HDMI hub and an HDMI to DisplayPort cable

The reason is that my monitor (Dell U2711) can only display 1440p through the DisplayPort, not possible with the HDMI one.

Thank you very much for your help!
Click to expand...

I have the exact same monitor, I ended up using SwitchResX to create a custom resolution for it 2560x1440/60Hz* and it works fine. I connect through the Anker premium hub. I connect HDMI to HDMI on the U2711, on occasion when the monitor wakes up from sleep connected to the rMB it is just a blue screen ( think old VCR ), if that happens i just press esc to make it sleep again and press another key to make it wake up, it only ever happens the one time from waking up.

* - Fairly certain 60Hz, I'm not at the computer right now.
 
willyx said:
Hello all,

I was wondering if it would be possible to output 1440p from the Macbook 12'' with the Apple HDMI hub and an HDMI to DisplayPort cable

The reason is that my monitor (Dell U2711) can only display 1440p through the DisplayPort, not possible with the HDMI one.

Thank you very much for your help!
Click to expand...

This is not possible the way you are asking. HDMI to displayport requires an active converter which I think everyone overlooked and is not something that is seen that often. A passive HDMI to displayport cable will not work here, and those are normally meant to convert a Displayport++ (note the ++) video output to HDMI.

The Apple converter is most likely converting Displayport to HDMI using the Displayport Alt-Mode per USB spec.

However, if you can find a USB-C to Displayport cable then you will be good, as there are enough displayport alt mode "lanes" available to run 2560x1440 on a Macbook 12.
 
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phillyboy82 said:
This is not possible the way you are asking. HDMI to displayport requires an active converter which I think everyone overlooked and is not something that is seen that often. A passive HDMI to displayport cable will not work here, and those are normally meant to convert a Displayport++ (note the ++) video output to HDMI.

The Apple converter is most likely converting Displayport to HDMI using the Displayport Alt-Mode per USB spec.

However, if you can find a USB-C to Displayport cable then you will be good, as there are enough displayport alt mode "lanes" available to run 2560x1440 on a Macbook 12.
Click to expand...

That's a great response that clarifies it.

Too bad I won't be able to use such an expensive monitor with the Macbook at full resolution.

Thank you and thanks all for your replies too!
 
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Happy to help. That dock mentioned in post #15 might be your best bet to get displayport while still allowing for USB port and charging access.
 
I have the same issue with a Dell U3011, the older gen HDMI on those models doesn't support over 1080p. Still waiting for a decent priced USB-C --> DisplayPort, but all the current offerings and hubs have mixed reviews.
 
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