Reddit mentions of Cable Matters 4K Mini DisplayPort to HDMI 4K Adapter (Mini DP to HDMI Adapter) in Black - Thunderbolt and Thunderbolt 2 Port Compatible

How are you connecting it? My T440s with base graphics runs my ultrawide like a champ with a MDP -> HDMI adapter. I used one of the HDMI adapters and an HDMI cable that specifically advertise compatibility with ultrawide resolutions, but I suspect any newish HDMI cable and adapter would work.

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FWIW this is the adapter I got and this is the hdmi cable

I have the exact same laptop and had the same issues as you mentioned. I almost gave up, but getting a good 4k mini DisplayPort to HDMI adapter worked. Thanks!

The one I used:
https://www.amazon.com/gp/product/B00K0UDJFI/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

If you read the specs of the Mini monitor it only displays up to HD in quality.

You'll need other hardware to get it to display 4k.

If your television set doesn't have a thunderbolt input, you're going to need 4k hardware to get from your Mac to it. None of it is cheap (expect to pay about $1k for something like this ultrastudio4k

You could try a Tbolt to 4k adpater. This is cheap and easy...

But it isn't truly what you should look at. Technically nothing is right on connecting to that TV for evaluative purposes. Using the $15 adpater (which is where I'd start btw) means that Premiere is outputting it as if it was another 'monitor' - wrong color space, OS interfereing with added color management.

But technically, color fidelity isn't important, because you're going to a consumer TV. Just try to get it 'close' to what you're looking at on screen. You'll never get it to match.

You can use this Mini DisplayPort to HDMI adapter. DisplayPort can carry audio, so it will pass that through the HDMI cable.

Dammit, you're right, sorry.

Just checked my 1440p monitor with a cheap adapter, doesn't work above 1080p.. and it seems to be a limit of passive cables. I've found looking for apple accessories is cheaper, since they used mDP for years, this is a pretty cheap one with good reviews: https://www.amazon.com/dp/B00K0UDJFI

I'm not sure if it can do 60fps for you though, since it's limited to 30Hz at 4K. Your monitor seems to have a Displayport connector, a mini Displayport to Displayport cable would probably be the better choice, since there's no need for an active component.

It is possible but rare, I have 2 rift headsets here trying them both on a Pcspecialist Defiance III with a 970M, 2 different issues in each set, old tv type interference on one (playable), image going black every 5/10 seconds on the other (unplayable) the only reason I'm testing is because the one headset (old tv interference) I first tried it with worked perfectly for about 4 hours the first time I used it but I can't replicate that again :(

For anyone reading this in future I got a "Cable Matters 4k mini displayport to HDMI adaptor" and oculus now works on my (pcspecialist Defiance III gtx 970m,

https://www.amazon.co.uk/gp/product/B00K0UDJFI/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

If you mean you have a mini DisplayPort out on your laptop and you want to hook it up the original Rift, I've seen others suggest this adapter will work.

Actually any cable like https://www.amazon.com/Cable-Matters-DisplayPort-Thunderbolt-Compatible/dp/B00K0UDJFI/ do work since 4k@30hz (hdmi 1.4) is enough to handle the rift. I know i have no issues with my standard passive hdmi-dp adapter

> LG 25UM55 21:9 monitor

Thanks for the in depth answer!

Unfortunately the monitor i have (http://www.lg.com/us/monitors/lg-29UM57-P-ultrawide-led-monitor) only has 2 HDMI ports so using a DisplayPort cable won't work. This adapter (http://www.amazon.com/Cable-Matters%C2%AE-DisplayPort-Thunderbolt-Compatible/dp/B00K0UDJFI/ref=cm_cd_al_qh_dp_t) claims to support 4k displays so I will find out if this works in 2 days.

The laptop itself is a 13-inch, Mid 2012. Hopefully that isn't the issue.

I use this one. Works fine for me.

Cable Matters Gold Plated Mini DisplayPort (Thunderbolt Port Compatible) to HDMI Male to Female Adapter - 4K Resolution Ready https://www.amazon.com/dp/B00K0UDJFI/ref=cm_sw_r_other_awd_sVlQwbQ9Z3X79

This is the adapter I got which works pretty well. Still need to connect it to an 4k capable HDMI cable and run that to your TV but it does the trick.

I have no personal experience with this, but:

/u/cybereality once recommended the Cable Matters Mini DisplayPort (Thunderbolt™ 2 Port Compatible) to HDMI Male to Female Adapter - 4K Resolution Ready. I see people in the answers section saying it works well.

Is this one possible too? https://www.amazon.com/dp/B00K0UDJFI/