I have found a thread on communities.intel.com discussing this: https://communities.intel.com/thread/97306

Since I’ll be running linux and xorg modelines can be tweaked, I think I’ll take the risk and try out this adapter.

…and as I learn more and more search terms to use, I keep finding more info, which I’ll link to here in case this thread turns up in search results.

An existing thread on this forum: https://insights.club-3d.com/thread/club-3d-intel-lets-sort-out-issues-with-intel-graphics-and-cac-1070-1170/

Mentioned there and also covered in a youtube video is that you want to use the timing mode CVT-RB (RB stands for reduced blanking).

On linux I don’t think there’s an option for reduced blanking, but the horizontal and vertical blanking intervals are all controlled through a modeline anyway, so if you get the right modeline, you should be able to do the same as CVT-RB.

In that vein, I found: https://medium.com/@ValdikSS/how-to-use-high-resolutions-with-older-hardware-58577d91b1f8

It’s been 24 years since I had to work out X11 modeline timings, but I’ve done it once so how hard can it be 🙂 This looks like it might help: http://www.uruk.org/projects/cvt/

Hi, the HD graphics 4400 is quite old, getting the UHD 60Hz 4:4:4 our will be very difficult. I have the HD 500 (Sept 2016), can do UHD 60Hz, but can’t get 4:4:4. I don’t why yet (Intel, MegaChips LSPCON, HDMI cable, TV). I’m in contact with 4 companies :DD https://communities.intel.com/thread/111370

Hi Camh,

I do not think HD4400 supports 3840x2160p at 60Hz.
When i check this link it also states 3200×2000 60Hz …
https://ark.intel.com/products/75107/Intel-Core-i3-4010U-Processor-3M-Cache-1_70-GHz

Where you got that info that you can output 4k 60Hz 4:4:4 ?

MST1407,

I think I have been confused by some wording in the manual for the Intel NUC D34010WYB which says: “The maximum supported resolution is 3840 x 2160 @ 60 Hz, 24bpp. The Mini DisplayPort interface supports the 1.2 specification.”

This is the only max resolution in the NUC manual (which is for either i3-4010U or i5-4250U).

But as you point out on the datasheet for the CPU, it cannot do that resolution.

If there was any point, I’d be rather angry at Intel right now. They’ve basically lied in the manual for the computer about its capabilities. Now I’ve got to get a new computer for the monitor. Sigh. (and I probably won’t be able to re-use my RAM either – I’ll bet it’s too slow for the newer models of NUC).

Still confused. The specs for the nuc says it supports UHD 4k: http://www.intel.com/content/www/us/en/nuc/nuc-kit-d34010wykh-board-d34010wyb.html

If you could force the HD graphics to output YCbCr 4:2:0 then UHD 60Hz might work. But Intel hides those options… https://communities.intel.com/thread/111279

Confusion continues. The 4th generation core processor datasheet also says it can do 3840×2160 @ 60Hz on displayport : https://www-ssl.intel.com/content/www/us/en/processors/core/4th-gen-core-family-desktop-vol-1-datasheet.html (p36).

So, my computer manual and the processor datasheet says it can do it. The only thing that says it can’t is one intel web page. Not sure why there is a discrepancy.

When my CAC-1170 arrives, I’ll see what I can get out of it. But otherwise my plan B is to use my new laptop instead. Plan C is a new nuc but I’m not ready for that yet.

Stefan75: Thanks for that but I’m on linux, so the options will be hidden in the source code instead 🙂

An update…

My CAC-1170 has arrived and I have set it up with my Sony 43x8000D screen. The TV has a setting that enables HDMI2 and 3 inputs to do hi-res 4k, so I have turned that on and plugged into HDMI2.

So far I can only get 3840×2160 @ 30Hz.

My confusion about the capabilities of my NUC/processor have mostly been sorted out. The processor family in general supports 3840×2160 @ 60Hz as the CPU has a 540MHz CDCLK (pixel clock). That res/refresh needs about 500MHz so all good. However, my NUC has the i3 4010U – the U is for ULT which are the lower power versions. These have a CDCLK of 450MHz which is not high enough to support 60Hz. It should be able to do 50Hz though (see below).

The NUC should be able to do 3840×2160 @ 60Hz using MST (multi-streaming displayport). I’m assuming that MST for a single hi-res monitor was a stop-gap technology whose time has passed and that the CAC-1170 will not convert DisplayPort MST to HDMI2.0 (a quick search did not turn up any relevant hits, although that is hampered by @MST1407’s username 🙂 )

So, for now my goal is to get 3840×2160 @ 50Hz. I do not yet have this working. I do have 3840×2160 @ 30Hz, and to be honest I have no problem using this. I don’t game – I just use xterms and chrome for the most part. I played a couple of videos and they were fine (but I’m not sure I have any videos > 30Hz). Perhaps if I had a desktop that utilised a lot of animation, I’d notice the low refresh rate, but I don’t.

I will keep trying to get 50Hz going. I have tried a few modelines at 35Hz, 40Hz, 45Hz and 50Hz and none of them work. I don’t know why yet as the pixel clock for the modes is within the machine’s CDCLK.

The other issue I have is that DPMS does not work. When the screen saver activates the TV says there is no signal on the screen and does not blank the display. I’m not sure if this is due to the CAC-1170 or the TV. I will experiment with the HDMI port on my NUC to see if the screen will blank. Even if I can’t get DPMS working, my backup plan is to use the HTTP POST protocol that the TV has for control purposes to send the screen into standby using that instead of DPMS.

For reference, this thread: https://communities.intel.com/thread/51410 contains the info about the i3-4010U CDCLK, which took a bit of searching to find.

Also, my 50Hz modeline that does not work is:
442.000000 3840 3888 3920 4000 2160 2163 2167 2211 +HSync -VSync

A follow-up for the people who end up here from a search…

I never tried again to get higher refresh rates working (> 30Hz). I am running at 4k 4:4:4 30Hz and I do not notice any sort of display flicker, so I have not spent any time trying to get higher refresh rates. A 7th gen NUC is on my wish list, and that has HDMI 2.0 native so that will likely be my next step.