Intel UHD-750 doesn't display 2k 75Hz on external monitor

[dapxe]

    My PC doesn't display 2k (2560x1440) with fresh rate 75Hz although my monitor support 75Hz on 2560x1440.It's only support 60Hz maximum in resolution 2560x1440.

   - I have updated the last driver ( version 30.0.100.9864)

   - I tried using HDMI 1.4 cable and HDMI 2.0 cable to connect

    - My motherboard is ASUS PRIME B560M-K and my processor is i5 -11500

    - My monitor is ViewSonic VX2780-2K-SHJD

Please help me to resolve this problem.

[RonaldM_Intel]

Hello @dapxe 

The information provided on the link you selected is accurate i.e. in order to drive the 2560x1440@75Hz video mode the pixel clock requirement is +- 304.25Mhz. The Intel Xe Graphics can support much more than that through its native HDMI 2.0 capability, however because the input on your monitor is HDMI 1.4 it forces Intel Xe to operate in HDMI 1.4 mode, and here the pixel clock is limited to 297MHz.

I would suggest perhaps test by using an HDMI 2.0-to-DP 1.2 adapter/converter so you can use the DP 1.2 input of this monitor.

Best Regards,

Ronald M.

[dapxe]

Hello RonaldM_Intel

Thank you for giving a concise and clear answer to my problem.
Reading your reply I understand that the UHD-750 is limited to 297MHz pixel clock when operating in HDMI 1.4 mode.
So when I connect my monitor to the UHD-750 via HDMI 1.4 it won't work at 2560x1440@75hz.
Here my problem has been clarified. You can close this topic.

Best regards.

[Alx24]

Under the same apparently limitation fell and very close in traffic to 2560x1440 at 75 Hz resolution of 2560x1600 at 60 Hz, which first appeared in Intel Core 5th Generation, but then did not appear in HDMI 1.4 Graphics until 11 Generation
when connecting a 4K display.

https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/mobile-5th-gen-core-family-datasheet-vol-1.pdf

Alx24.

[Alx24]

In the table in attachment A1.jpg above, the last line with the maximum resolution for Core 11 Generation Graphics
specified:

5120 x 3200, 60 Hz, 1042.5 MHz, 31.28 Gb/s

Displays with this resolution also very often have increased refresh frequencies of up to 75 Hz and above.

LG 40WP95C UltraWide Monitor ( Model 2022 )

https://thunderboltlaptop.com/best-thunderbolt-4-monitors/

Resolution: WUHD (5120x2160), 72Hz

Also for it is indicated and 75Hz.

Lenovo ThinkVision P40w-20

https://psref.lenovo.com/syspool/Sys/PDF/datasheet/ThinkVision%20P40w-20_datasheet_EN.pdf

Resolution 5120 x 2160

Refresh rate 75Hz ( Thunderbolt™ and DisplayPort™ only )

DELL U4021QW

https://www.displayspecifications.com/en/model/81f222f6

5120 x 2160 pixels

Refresh rate: 24Hz - 86Hz

Alx24.

[Alx24]

In the table in attachment A1.jpg above, the last line with the maximum resolution for Core 11 Generation Graphics
specified:

5120 x 3200, 60 Hz, 1042.5 MHz, 31.28 Gb/s

Displays with this resolution also very often have increased regeneration frequencies of up to 75 Hz and above.

LG 40WP95C UltraWide Monitor ( Model 2022 )

https://thunderboltlaptop.com/best-thunderbolt-4-monitors/

Resolution: WUHD (5120x2160), 72Hz

Also for it is indicated and 75Hz.

Lenovo ThinkVision P40w-20

https://psref.lenovo.com/syspool/Sys/PDF/datasheet/ThinkVision%20P40w-20_datasheet_EN.pdf

Resolution 5120 x 2160

Refresh rate 75Hz ( Thunderbolt™ and DisplayPort™ only )

DELL U4021QW

https://www.displayspecifications.com/en/model/81f222f6

5120 x 2160 pixels

Refresh rate: 24Hz - 86Hz

Alx24.

[Alx24]

Noticeably decrease in the popularity of the audio-visual interface HDMI,
which played a huge recognized role in the preceding time, in mobile systems
and as a consequence of this connectors mini-HDMI, micro-HDMI. It's not in Microsoft Surface
and LENOVO Yoga. With HDMI there are sensitive limitations, but it is quite successful
and appreciated in 4K TV's, HDMI 2.1 is in modern 8K TV's.
In terms of the number of connectors in HDMI monitors, it exceeds or is not inferior to DP if the monitor
has both inputs, it is still supplied with a factory HDMI cable.

https://www.intel.com/content/www/us/en/products/details/processors/core/i5.html

"12th Generation Intel® Core™ i5 Processors"

https://www.intel.com/content/www/us/en/products/details/processors/core/i7.html

"12th Generation Intel® Core™ i7 Processors"

New graphics Intel® UHD Graphics 770, which is worth paying attention to:

https://www.intel.com/content/www/us/en/products/sku/134594/intel-core-i712700k-processor-25m-cache-up-to-5-00-ghz/specifications.html

"Intel® Core™ i7-12700K Processor"

...

Intel® UHD Graphics 770

Graphics Output eDP 1.4b, DP 1.4a, HDMI 2.1
Execution Units 32
Max Resolution (HDMI)‡ 4096 x 2160 @ 60Hz
Max Resolution (DP)‡ 7680 x 4320 @ 60Hz
Max Resolution (eDP - Integrated Flat Panel)‡ 5120 x 3200 @ 120Hz

...

https://www.intel.com/content/www/us/en/products/docs/processors/core/core-technical-resources.html

https://cdrdv2.intel.com/v1/dl/getContent/655258

...

8.0 Graphics

...

9.0 Display

9.1 Display Technologies Support

HDMI* 2.1 High-Definition Multimedia Interface Specification Version 2.1

Notes: Processor support native HDMI* 2.1 TMDS compatible ports

Processor support non-native HDMI* 2.1 port by using DP* to HDMI* protocol converter

HDMI 2.1 is actual also in high frequency monitor area:

https://thunderboltlaptop.com/hdmi-2-1-monitors/

"9 Best HDMI 2.1 Monitors – Buying Guide (2021)"

For 5Kx2K display's HDMI 30 Hz is suitable.

Alx24.

[AndrewG_Intel]

Hello @Alx24

Thank you for posting on the Intel® communities and for all the time you took to share information, suggestions, links, and comments. We appreciate it when community peers are interested in trying to help other users.

Best regards,

Andrew G.

Intel Customer Support Technician

[AndrewG_Intel]

Hello @dapxe

In regards to your inquiries, we would like to inform you that we go over official specifications and through HDMI 1.4 we guarantee 4K@30hz; however, 2560x1440 @ 75Hz already pushes HDMI 1.4 bandwidth.

The Intel® Graphics Report properly detected the Supported Video Mode of 2560x1440 @ 75Hz meaning it is identifying the resolution correctly.

Also, our latest generic driver has been confirmed to be able to push 4K@60Hz over HDMI 1.4 and 5K@60Hz over DisplayPort (DP) 1.4 thus it is not a driver issue.

Do you see if the desired resolution is available in Windows® Settings > Display, and Under Advanced Display Settings?

As we previously pointed out, there are other factors that we don't control that may impact the availability to achieve the resolution + refresh rate and at this point, it seems it would most likely be needed to use DP 1.2 or HDMI 2.0 to successfully drive this video mode.

Best regards,

Andrew G.

Intel Customer Support Technician

[Alx24]

Limit values are given in the documentation for 24bpp that define traffic - 8 bit per color.

That is tab "Color" in Intel Graphics Command Center

or "Settings > Display, Advanced Display Settings"

with "Bit depth 8-bit"

There are very complex dependencies:

https://www.intel.com/content/www/us/en/products/sku/134589/intel-core-i512600k-processor-20m-cache-up-to-4-90-ghz/specifications.html

...

Intel® Iris® Xe Graphics only: to use the Intel® Iris® Xe brand, the system must be populated with 128-bit (dual channel) memory. Otherwise, use the Intel® UHD brand.

...

Alx24.

[dapxe]

Hello Andrew G

  I have read the content of your reply. I am not satisfied because the issues I have raised are still not answered clearly and convincingly by you. You are deliberately avoiding answering the problems I have raised in the previous post.Do not redo your posted 2560x1440-75hz video (Because I suspect that you didn't use HDMI 1.4 connection in this video which is the result when you use a different connection other than HDMI 1.4 ).At the same time, you and Alx24 posted many articles with inappropriate content to direct my problem to other unrelated issues. So to get to the final conclusion I suggest you:
  Please answer "yes" or "no" to the question: Does the UHD-750 integrated in the i5-11500 connect to the monitor 2560x1440@75hz via HDMI 1.4 work at 2560x1440@75hz? (In reality, not in theory)
  In case you answered "yes", please make a video with complete, clear and convincing content to illustrate your answer.
  In case you answered "no", you don't have to do anything.
  In case you answer is not clear again, I suggest you stop supporting me in this matter and replace with another customer support technician.

Best regards.

[Alx24]

Thank you very much dapxe. You are also incredibly pleasant and interesting to deal with.

On your monitor page

https://www.viewsonic.com/ap/products/lcd/VX2780-2K-SHDJ

like nowhere else talks about the advantages of 75Hz over 60Hz

"Smooth Refresh Rate
The VX2780-2K-SHDJ features a 75Hz refresh rate for fluid visuals from web browsing to gaming. Experience the benefits of faster frame loading across your entire PC experience.
75Hz"

when showing dynamic scenes, the corresponding image is shown and it is quite understandable
your deep experiences.

On page

https://www.intel.com/content/www/us/en/products/docs/processors/core/core-technical-resources.html

"Technical Resources: Intel® Core™ Processors"

"11th Generation Intel® Core™ Processor Family"

11th Generation Intel® Core™ Processor Family
Supporting 11th Generation Intel® Core™ processor families for desktop platform, formerly known as Rocket Lake
Volume 1

https://cdrdv2.intel.com/v1/dl/getContent/634648

...

Table 2.14 Display Resolutions and Link Bandwidth for Multi-Stream Transport Calculations

my attachment A1.jpg

Refresh Rate[Hz]

Pixel Clock[MHz]

Link Bandwidth[Gbs]

and consider in it the 3 most important lines

////////////////////////////////////////////////////////////////////////////////

2560 1440 60 241.5 7.25

3840 2160 30 262.75 7.88

--------------------------------------------------------------------------------

2560 1600 60 268.5 8.06

////////////////////////////////////////////////////////////////////////////////

Intel processor graphics from 6th Generation correspond to HDMI 1.4 and support 4K resolution at 24Hz at first,

and now at 30 Hz. Resolution 2560x1440 is supported at 60 Hz, but 2560x1600 only at 30 Hz and in the table

it corresponds to 8.06 Gbs - it is worth remembering.

When connecting 4K display to Intel Graphics HDMI 1.4, it is known for sure that:

2560 1440 60 Hz - HDMI 1.4 60 Hz o.k.

2560 1600 60 Hz - not HDMI 1.4 60 Hz but only 30 Hz.

In this way, this table reflects the principles of Intel Corp. in Graphics.

If you count the number of transmitted color bits by subdiving Link Bandwidth on pixel Clock then in these three cases

you get the number 30 bit.

7.25 Gbs / 241.5 MHz = 30 bit

7.88 Gbs / 262.75 MHz = 30 bit

8.06 Gbs / 268.5 MHz = 30 bit

In this mode, it is impossible to go from enabled 2560x1440 60 Hz to 2560x1440 75 Hz,

but it is possible if the pixel will account for 24 bits or less.

How to achieve this, or it is impossible can tell Intel Corp.

By the way, in the EDID of your display from Report.txt 75 Hz are very detailed:

////////////////////////////////////////////////////////////////////////////////

Vendor Specific Data Block HDMI 1.4
IEEE OUI: 000C03
Source Physical Address: 1000
Supports ACP, ISRC1, ISRC2
Supports 48 bits/pixel (16 bits/color)
Supports 36 bits/pixel (12 bits/color)
Supports 30 bits/pixel (10 bits/color)
Supports YCbCr 4:4:4 Deep Color
////////////////////////////////////////////////////////////////////////////////
Supports Dual DVI
Max TMDS Clock Rate: 310 MHz
////////////////////////////////////////////////////////////////////////////////
Video/Audio Latency Fields Present

////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////

75 Hz

Detailed Timing Descriptor
////////////////////////////////////////////////////////////////////////////////
Pixel Clock: 301.85MHz / 75 Hz

Horizontal Active: 2560
Horizontal Blanking: 160

Vertical Active: 1440
Vertical Blanking: 41
////////////////////////////////////////////////////////////////////////////////
Horizontal Sync Offset: 48
Horizontal Sync Pulse: 32
Vertical Sync Offset: 3
Vertical Sync Pulse: 5
Horizontal Display Size: 608
Vertical Display Size: 355
Horizontal Border: 0
Vertical Border: 0
Interlaced: false
Stereo Mode: 0
Sync Type: 3

2-Way Line-Interleaved Stereo: false

(Pixel Clock / (Horizontal Active + Horizontal Blanking)) / (Vertical Active + Vertical Blanking)

(301850000 / (2560.0 + 160)) / (1440.0 + 41) - 74.931981570481

////////////////////////////////////////////////////////////////////////////////

which are feasible at 24bpp if at all.

--------------------------------------------------------------------------------

https://www.philips.co.uk/c-p/275E1S_01/lcd-monitor

After many words here about how good the HDMI interface is:

"HDMI ensures universal digital connectivity
An HDMI-ready device has all the required hardware to accept High-Definition Multimedia Interface (HDMI) input. An HDMI cable enables high-quality digital video and audio to be transmitted over a single cable from a PC or any number of AV sources (including set-top boxes, DVD players, A/V receivers and video cameras)."

for 2560x1440 75hz display recommended to use DisplayPort and specified the required speed of 10.8 Gbps/sec:

"DisplayPort connection for maximum visuals
DisplayPort is a digital link from PC to monitor without any conversion. With higher capabilities than DVI standard, it is fully capable to support up to 15 metre cables and 10.8 Gbps/sec data transfer. With this high performance and zero latency, you get the fastest imaging and refresh rates — making DisplayPort the best choice for not only general office or home use, but also for the more demanding gaming and films, video editing and more. It also keeps interoperability in mind via the use of various adapters."

--------------------------------------------------------------------------------

From what I said earlier about the lack of HDMI in Microsoft Surface products, you can't make a definitive

conclusion about the attitude of Microsoft Corp. to it because it is quite logically accessible through other high-performance interfaces.

https://www.microsoft.com/en-us/store/collections/cablesconnectorsadapters

"Cables, connectors and adapters"

For your system and your monitor, one of the many USB-DisplayPort adapters would be fine:

https://www.amazon.com/usb-displayport/s?k=usb+to+displayport

--------------------------------------------------------------------------------

The history of your question has been going on for 10 years and you can find including your question when searching

"2560x1440 75 Hz via HDMI"

Alx24.

[Alx24]

Of course, there is also the option to select the display resolution to use "Custom Resolution" in "Intel Graphics Command Center" which
is called when you click "+" in "Display" in the "Resolution" line next to the combobox with resolution value.

https://www.intel.com/content/www/us/en/support/articles/000056144/graphics/legacy-graphics.html

"How to Set Custom Resolutions and Modes in Intel® Graphics Command Center"

One of the "Basic Custom Resolution" options is similar to using a simple Windows API function "ChangeDisplaySettings"

https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-changedisplaysettingsa

with a small set of parameters, the other uses numerical detailed data from the EDID, which has already been met and discussed here.
It should be noted that displays from different manufacturers have different frequency, line end and frame times and no
correspond exact to the data used by Intel Corp. for data in tables.

Previously, it was proposed to use the USB-DisplayPort connector, as it is more versatile and practical compared to
with a discrete video card with DisplayPort, but you can also use a discrete video card.

First 2560x1440 75Hz display:

https://www.asus.com/us/Commercial-Monitors/PB278Q/

Alx24.

[vijay666]

I am also facing same issue with 

Viewsonic VX2480-2K-SHD model which supports the resolution  2560x1440@75HZ 

DELL 5410 laptop

Processer - Intel i3 -1125G4

OS - windows 11 

Intel UHD graphics version - 30.0.101.1191

If I connect the monitor Via HDMI 1.4 to HDMI I get - 2560x1440@60Hz

Connection HDMI to USB C converter I get - 2560x1440@75HZ

Connection Display port to USB C I get - 2560x1440@75HZ

HDMI to HDMI it is restricted to only 60HZ 

I also did same test on Linux OS 

Same Dell 5410 laptop 

OS - fedora 35

I got the surprising result 

HDMI to HDMI -   2560x1440@75HZ

I have not installed any special package here on Linux to get 75hz .It worked natively .

But in Linux I am getting 75Hz and no limitation on HDMI .

I do not understand why we have the limitation on windows 11 HDMI to HDMI only at 60Hz ?

[phr]

Probably the difference is in pixel clock - there are two possible modes for 2560x1440@75 Hz:

CVT-RB with pixel clock 304.25 MHz

CVT-RBv2 with pixel clock 295.416 MHz

Since Intel limits pixel clock to 297 MHz for HDMI 1.4, only CVT-RBv2 mode can be used. But e.g. Dell monitors only announce CVT-RB mode in EDID.

See https://tomverbeure.github.io/video_timings_calculator for more details.

[gilmarlp]

Thank you very much!

I was having this problem with my Iris Xe Graphics powered laptop, and with your response I could solve my issue.

Here's what I did, if it helps anyone:

- I was trying to run my 1440p monitor at the maximum supported refresh rate of 75Hz via HDMI;

- The resolution and refresh rate was listed, but I couldn't select it;

- Your reply helped me a lot because I used CRU (custom resolution utility) to set a custom resolution of 1440p @75Hz but with the CVT-RB2 mode, resulting in the 295.416MHz supported by Intel with HDMI 1.4;

- Now my monitor is running at 1440p 75Hz 😁