Intel UHD 605 won't output to 4k 60Hz on TV

[Cuddl3s]

Hi, I don't know if anyone can help but I've been driven up the wall try to get this to work and this forum is my last resort. 

I have a Dell Wyse 5070 which has an Intel J5005 Processor and Intel UHD Graphics 605 (128 Mb) running Windows 11. The system has 3 Displayport outputs and i'm trying to connect it to a Samsung  65QN85C (65 inch miniled capable of 120 hz at 4K) through a "Vention" DP to HDMI cable that supports 4k at 60 Hz. 

I've tried connecting another PC with an NVIDIA GT1030 to the same TV and with the same cable and it works at 4k 60hz just fine so that rules out the TV or the cable as being the problem.

When I installed the Windows 11 on the Wyse and the generic drive windows installed reported 3840x2160 at 64 Hz through the same cable but unfortunately I couldn't play back any videos and once I installed an Intel drive max refresh available is 30Hz.

I have tried a bunch of Intel drives but none of them work and I suspect that the issue is how the Intel drivers recognise the TV, perhaps artificially limiting the supported modes as I have tried this same system connected with the same cable to a 34 inch MSI 34 CQR monitor and through scaling(monitor only supports 3440x1440) it was outputting at 3840x2160 at 60 Hz to my monitor. 

Does anyone have any idea what it could be and how i can sort it?

[MUC]

Dell Wyse 5070 Extended Thin Client User Guide:

13 ... Two DisplayPort v1.2a, supports up to two displays at 4K @ 60 Hz
15 ... DisplayPort v1.2a without audio

Please provide a link to the Vention cable product you are using.

Please create a Report for Intel Graphics Drivers when the computer is connected to the switched on TV and attach the output file here.

[Cuddl3s]

Thank you for getting back to me,  yes that is the system i am using and I've tried all 3 ports so far none of them work at 4K 60Hz.

The cable I am using is this one, 

Vention DP to HDMI cable 

which seems to be a decent Chinese brand, supposedly supporting DP 1.2. 

As mentioned previously I have tried this cable with another PC with a GTX 1030 and it displayed fine at 4k 60Hz, so I am almost certain the culprit here is poor Intel drivers. I mean the release latest ones don't even have a setting to change the resolution and refresh rate but instead sends to Windows setting for that, I mean how lazy is that.

On another note, I have another 2 PC's, one with I3 8350K and another with a Intel Core m7-6Y75, neither of those work even with HDMI connection, not bothered about these 2 working but thought I would test it out rule out as many possibilities.  

Also tried my Dell Wyse 5070 with a LG 4K tv and it didn't work with that either, so its not that i doesn't like Samsung. 

[MUC]

Unfortunately, connections with adapters are not free from pitfalls. After reviewing the diagnostic data, the first step I would ask you to perform is to activate the “Input Signal Plus” option on the Samsung TV. According to the Extended Display Identification Data (EDID) transmitted by the TV to the graphics hardware in your Dell Wyse 5070, it currently only offers 300 MHz TMDS. This is not enough for 4K with RGB color model.

If you have Input Signal Plus enabled, please create a Report for Intel Graphics again.

If the option is not available on your TV, then we have to assume that the adapter cable itself represents the limit of 300 MHz TMDS. In this case, it would probably still be possible for the Nvidia graphics to output a signal as 4K @ 60 Hz YCbCr 4:2:0, but this is not possible with the Intel UHD605 via DisplayPort.

[Cuddl3s]

Thank you for the information, finding more little by little 

I have activated Samsung Signal plus on the tv and re-done the diagnostics(see attached) still not able to select 60 Hz.

I am total noob at this, so why can't the UHD 605 do the 4K @ 60 Hz like the GTX 1030? Is it cause of it is running through Displayport (even though the GTX 1030 was also running from displayport to hdmi) ? or is it cause the UHD 605 doesn't support YCbCr 4:2:0?

[MUC]

The capabilities that the TV is now sending are very good. It could even do 4K @ 120 Hz. But that's not possible with this Dell device anyway. The Intel driver is also up to date with version 31.0.101.2127, there is nothing better.

The reason why you still can't select 4K @ 60 Hz is difficult to fathom now as we don't know exactly what's inside the cable.

4K @ 30 Hz RGB = 9 Gbps = 300 MHz TMDS
4K @ 60 Hz YCbCr 4:2:0 = 9 Gbps = 300 MHz TMDS

The YCbCr 4:2:0 color model is a type of data compression that is not supported by the Intel hardware via DisplayPort. However, from Nvidia it does. But that doesn't have to be an advantage, as text legibility with YCbCr 4:2:0 is not good. Maybe negligible on a TV, but it's a compromise.

4K @ 60 Hz RGB = 18 Gbps = 600 MHz TMDS. However, this is only possible if a so-called protocol converter chip is integrated into the cable, which actively changes the signaling protocol. Passive cables support the level shifter (LS) mode: Alternating Current coupled Transition-Minimized Differential Signaling (TMDS) from a dual mode DisplayPort source is repeated to a Direct Current coupled HDMI output. But these capabilities end at 300 MHz (9 Gbps).

If you value 4K @ 60 Hz RGB on your Dell Wyse 5070, then I would recommend this: CAC-1087 (Chip Type: Synaptics VMM7100) 

It also works with other advanced source devices featuring DisplayPort 1.4a up to 4K @ 120 Hz RGB.

[Cuddl3s]

Many thanks for the detailed explanation and shedding some light on the matter as well as the link to the active adapter, unfortunately buying one of those adapters is out of question as its almost as much as i paid for Dell, at which point I might switch it for a system with an Intel N100 processor with HDMI ports rather than spend that much on a connecter.

Back to my problem, I tried my cable with my AMD RX 6600 and it outputs to the TV at 4k at 60hz with 8 Bit depth, colour format YCbCr444, SDR, so i guess that the issue then is that the Intel drivers don't support YCbCr444, at least not over Displayport if i understood correctly from your post, but then did some digging and came across this thread Link in which someone seems to imply they got their Intel HD 500 working at 4k 60 hz with YCbCr420 over Displayport, so question is is there any way to force it so signal is outputed in YCbCr420 or YCbCr444 rather than RGB (my Intel HD 630 on same PC gives me 4K at 30 hz with 8 Bit depth and RGB colour format, also SDR).

[MUC]

4K @ 60 Hz RGB = 4K @ 60 Hz YCbCr 4:4:4 = 18 Gbps 600 MHz (8-bit SDR)

You can find an explanation of RGB/YCbCr (4:x:x) here.

Your AMD graphics card can apparently operate the adapter differently than the UHD605 can.

Before activating Input Signal Plus, the TV already offered the Intel graphics to output a signal with YCbCr 4:2:0:

Unfortunately, that obviously doesn't work. It is not possible to say for certain which device this is ultimately due to. Every interface for video transmission always introduces new risks, which is why official Intel support recommends always using direct cable connections of one type (DisplayPort > DisplayPort || HDMI > HDMI).

If you are considering using a device with an Intel N100 processor, then this might be interesting:

N100 DP1.4 > VMM7100 > LG TV (4K @ 120 Hz)

Adapter used: ULT-WIIQ from Amazon

Please note that this variant requires an Ultra High Speed HDMI Cable and new unexpected problems may arise due to the lossy plug connectors. The cable should then be no longer than 3 meters, but also no shorter than 2 meters. Depending on the operating environment, HDMI cabling can become a bit of a science.

[n_scott_pearson]

How much memory does this SFF PC have? There are limitations if only 4GB is included (but it should still be able to support a single 4K monitor at 60Hz).

Ignoring my general position on Chinese cables (namely that 'good quality' and 'from China' should rarely be included in the same sentence), I still think the issue is with the cable. Does it actually SAY that it can support a 4K@60Hz connection? So many of these really only support 4K@30Hz unless they actually say 4K@60Hz on them. Have you looked to see whether the cable company has updated LSPcon firmware for this particular cable?

...S

[Cuddl3s]

The Dell Wyse 5070 has 8 GB of ram (can upgrade to 16 if need be but doubt it will do anything for this issue), and can output to 4k at 60hz (through scaling) to my MSI 34 inch monitor (has 3440x1440 native resolution monitor, where it says the signal resolution is 3840x2160 in windows settings). 

I'm still trying to get my head around all the valuable information MUC has given me, and how this makes my cable work with dedicated graphics cards but not the Intel integrated one. 

I have tried the cable last night on another PC, equipped with a AMD RX 6600 and it outputs to the TV at 4k at 60hz with 8 Bit depth, colour format YCbCr444, SDR. When switching to integrated graphics Intel HD 630 on same PC I get 4K at 30 hz with 8 Bit depth and RGB colour format, also SDR.

As to the cable on the listing where I bought it from it did say it supports 4k at 60hz, but the packaging is lacking in any detail as with all Chinese products but the cable obviously does work though only with dedicated graphics cards it would seem. Also forgot to say previously but this cable is 2 meters long.

With regards to the LSPcon firmware update, I am not familiar with what that is, presumably that is only for cables that have chips in them? this one most likely doesn't (was only like 5-7 British pounds) and quick search seems to indicate this company would probably not issue any updates.