Intel® Core™ i5-1135G7 Processor HDMI max bandwidth

[Mrsha]

I'm running the iris GPU with a TV at 4k. It runs at 4k 60Hz IF I use YCBCR_420 color format. If I change to RGB or YCBCR_444 which is a must for PC usage, it goes from 60 to 30Hz refresh rate.

On the specs page it says:

Graphics Output: eDP 1.4b, MIPI-DSI 2.0, DP 1.4, HDMI 2.0b

Max Resolution (HDMI)^‡: 4096x2304@60Hz

I'm using a HDMI 2.1 cable. HDMI 2.0b supports 4k 60Hz with RGB/444 color code. It's just under 18Gb/s. I also tested 2 other different HDMI 2.0 cables and it's the same.

I'm also not using HDR or anything of the sort.

My Color Depth is BPC_8.

[MUC]

Please check your TV settings. Most devices are set to "Standard" for compatibility reasons, which corresponds to a bandwidth of ~300 MHz TMDS (4K @ 30 Hz RGB or 4K @ 60 Hz YCbCr 4:2:0).

Example for a Sony TV:

You can enable 4K @ 60Hz RGB 4:4:4 this way. But keep in mind that this signal is almost the maximum bandwith for HDMI 2.0. If you use long cables you may have problems due to signal degradation.

[Mrsha]

Hi MUC, thanks for the answer

My TV is a Samsung QN90B. If it's this option you're referring to then it's already enabled for all ports.

Also, my HDMI cable is small so I don't think I'll have a problem with that.

[MUC]

Could you generate an Intel Graphics Driver report? Please do as described here and attach the *.txt file.

[Mrsha]

Here's the report

[MUC]

The Extended Display Identification Data (EDID) looks good.

May I ask which PC device that exactly is? A NUC? A Laptop? The exact model number?

[Mrsha]

It's a laptop. Samsung book, np550xda.

[Mrsha]

To be more precise just in case, I found it on the box: NP550XDA-KH2BR

[MUC]

Samsung Book 15 NP550XDA-KF2BR ?

https://downloadcenter.samsung.com/content/UM/202208/20220829150551169/Win11_Manual_ENG.pdfhttps://downloadcenter.samsung.com/content/UM/202208/20220829150551169/Win11_Manual_ENG.pdf

Is this correct?

According to my sources the HDMI output is only version 1.4

So this may explain why you can't get 4K @ 60 Hz RGB.

The manual, however, states:

i5-1135G7 can output a DisplayPort signal according to version 1.4a HBR3.

IF Samsung did wire this correctly to the USB-C port, then you can use an appropriate adapter to bring 4K @ 120 Hz RGB 4:4:4 HDR10 via HDMI 2.1 to your impressive TV.

You can try one of those:

Product	Connection	Chip Type	Current Firmware
Club 3D CAC-1587	USB-C > HDMI 2.1 FRL	VMM7100	7.02.120	support@club-3d.com
Club 3D CAC-1586	USB-C > HDMI 2.1 FRL socket	VMM7100	7.02.120	support@club-3d.com
Cable Matters 201362-A	USB-C > HDMI 2.1 FRL	VMM7100	7.02.120	Firmware Update

I successfully tested them with a NUC 11 operating i7-1185G7 processor.

Please note that those adapters, that enable 4K @ 120 Hz, may arrive with older firmware than mentioned. If it is not working correctly, a firmware update can be done through Microsoft Windows when the product is plugged. Cable Matters provide updates on their website. This would be the easiest way. When I asked Club 3D for a firmware update it took a few days until they responded to the E-Mail request.

Here we got another successful use: community.intel.com/t5/Intel-NUCs/New-Nuc-11-i5-4k-issues/m-p/1453325#M97563

[Mrsha]

No, this is not mine. Mine has in order: Charging port, network port, HDMI, USB, USB-C, 3.5mm headphone jack.

Here: https://downloadcenter.samsung.com/content/UM/202101/20210122141231319/Win10_Manual_ENG.pdf

[Mrsha]

Also, I can run at 4k 60hz (without rgb/444), which is more than HDMI 1.4 supports, so I'm 100% that it is HDMI 2.0/2.0b.

[MUC · Accepted solution]

HDMI 1.4 is specified up to 340 MHz using Transition Minimized Differential Signaling (TMDS). This enables 4K @ 30 Hz RGB or 4K @ 60 Hz YCbCr 4:2:0. Here is a calculator you can play with:

4K @ 30 Hz RGB = 4K @ 60 Hz YCbCr 4:2:0 = 297 MHz = 87 % bandwith need of HDMI 1.4 and 50 % of HDMI 2.0

4K @ 60 Hz RGB = 594 MHz = 175 % bandwith need of HDMI 1.4 but 99 % of HDMI 2.0

Please refer to the calculation results in the column "CEA-861" since this is the HDMI video timing

Even if the processor does support HDMI 2.0 it unfortunately doesn't automatically mean that every implementation does provide this. This is up to the OEM (Samsung here). In doubt, you will have to ask them.

However, the circumstances of your device remain valid as described, since there is also an USB-C port, which is described in your link as a video output:

You can try the suggested USB-C > HDMI 2.1 FRL adapter. If it doesn't meet your expectations, you can return it.

[Mrsha]

I checked the website you linked, and I understand what you said about 1.4 being able to output 4k60hz with yc420.

I contacted Samsung support and I was told it is 2.0b. I questioned where he got the information and I was told it was from their data base.

He didn't say what could be the problem though. I'll try contacting Samsung again tomorrow to see if someone confirms or has any idea what could be the problem.

[Mrsha]

I tried contact with Samsung again but 2 other people just said there's no version on the system, so I guess you're right. As for the USB C cable, I can't find any on amazon in my country so I'll just have to use it in 30hz even though it's laggy.

Thank you very much for your help.