topic Re: Intel UHD-750 doesn't display 2k 75Hz on external monitor in Graphics

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

dapxe — Wed, 13 Oct 2021 15:35:35 GMT

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.

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

AndrewG_Intel — Thu, 14 Oct 2021 21:37:57 GMT

Hello dapxe

Thank you for posting on the Intel® communities.

Setting 2560x1440@75Hz could be possible over HDMI* 1.4. However, there are other factors that we don't control that may be pushing the remaining bandwidth percentage that is reserved for overhead and leading to an issue preventing selecting the desired resolution or other display issues (flickering, black screens, etc).

Generally speaking, the Max Effective Bandwidth for HDMI* 1.4 is 8.16 Gbps. Using a bandwidth calculator to calculate the required bandwidth for 2560x1440@75Hz, it shows that the Total Signal Bandwidth required is 8.29 Gbps, so it could be exceeding the bandwidth available for data.

Also, checking the User's Manual for the monitor ViewSonic* VX2780-2K-SHJD, we noticed it supports "2560x1440 @60,75Hz" and it comes with HDMI 1.4; however, the documentation doesn't specify if this Display Mode 2560x1440@75Hz is supported through HDMI or only through DisplayPort*. (Refer to Appendix > Specifications, page 30).

In this scenario, our recommendation is that you first confirm with ViewSonic* Support if this Display Mode 2560x1440@75Hz is supported through HDMI* 1.4 in this monitor. Please feel free to share any feedback regarding this matter.

Best regards,

Andrew G.

Intel Customer Support Technician

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

dapxe — Fri, 15 Oct 2021 04:46:53 GMT

Thank you for your reply

I have contacted ViewSonic service center. They confirmed 2560x1440 @ 75 hz display mode is supported through HDMI 1.4 in this monitor.
They connected my monitor to another graphics card through HDMI 1.4. As a result the monitor worked at 2560x1440@75hz.
Is it possible to confirm that the cause of my problem is the UHD 750?

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

AndrewG_Intel — Mon, 18 Oct 2021 20:03:59 GMT

Hello dapxe

Thank you for your response and for the feedback from ViewSonic*.

In order to test this further, could you please try a Clean Installation of Intel® Graphics Drivers in Windows* but instead of using the generic driver from Intel, please use the customized¹ driver provided by your motherboard manufacturer ASUS* > VGA Driver Version 27.20.100.9127?

During the process, please follow steps 5 to 15, including disconnecting from the Internet and making sure you get to the Microsoft Basic Display Adapter before trying to install the graphics driver.

If the behavior persists, please report back the outcome/behavior and repeat the clean installation process but this time using Intel® Graphics DHC generic driver from Intel Version 30.0.100.9955 (Latest).

Please make sure during the tests you use a high-quality HDMI 2.0+ cable.

Also, we recommend checking your monitor's documentation/website (or reviewing with ViewSonic support) to determine if there are drivers or firmware available for your monitor? The monitor's driver (aka .inf files) supplies configuration information and the operating system (OS) uses the file to implement the plug and play (PnP) features of the monitor. This configuration information includes supported refresh rates, screen resolution, color quality settings, etc.; so this allows to properly detect the monitor features.

If the issue is not solved, please provides us with the following information:

1- Screenshots from Intel® Graphics Command Center > Display > General tab. (please show the Resolutions and Refresh rates available in the drop-down menus).

2- A Report for Intel® Graphics Drivers following the steps on the link. Make sure the monitor in question is connected to the computer when generating the report.

3- An Intel® System Support Utility (Intel® SSU) report to gather more details about the system:

Download the Intel® SSU and save the application on your computer
Open the application, check the "Everything" checkbox, and click "Scan" to see the system and device information. The Intel® SSU defaults to the "Summary View" on the output screen following the scan. Click the menu where it says "Summary" to change to "Detailed View".
To save your scan, click Next and click Save.
Once you have saved the file (.txt file), please attach it to your reply.

To upload and attach a file, use the "Drag and drop here or browse files to attach" option below the response textbox.

Note:

1- The driver or software for your Intel® component might have been changed or replaced by the computer manufacturer (OEM) and OEM drivers are handpicked and include customized features and solutions to platform-specific issues, therefore, the usual recommendation is to use the OEM driver as the first option.

Best regards,

Andrew G.

Intel Customer Support Technician

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

dapxe — Tue, 19 Oct 2021 06:55:12 GMT

Thank you for your reply

I have followed all your instructions.

Result: My problem is still not resolved.
I provide you with the information of the system upon your request in the attachments.
I hope after having this system information you can help me to solve my problem.

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

Alx24 — Tue, 19 Oct 2021 16:04:41 GMT

In the latest document "CTA-861-G" no VIC at all corresponding to the resolution of 2560x1440 @ 75Hz and respectively timings.

https://pdfcoffee.com/cta-861-gfinalrevised2017pdf-pdf-free.html

...

86 2560 1080 Prog 3750 1190 1100 20 26.400 24.0003 99.000
87 2560 1080 Prog 3200 640 1125 45 28.125 25.000 90.000
88 2560 1080 Prog 3520 960 1125 45 33.750 30.0003 118.800

113 2560 1080 Prog 3750 1190 1100 20 52.800 48.0003 198.000

89 2560 1080 Prog 3300 740 1125 45 56.250 50.000 185.625

90 2560 1080 Prog 3000 440 1100 20 66.000 60.0003 198.000

91 2560 1080 Prog 2970 410 1250 170 125.000 100.00 371.250

92 2560 1080 Prog 3300 740 1250 170 150.000 120.003 495.000

...

86 2560x1080p 23.98Hz/24Hz 64:276 1:1
87 2560x1080p 25Hz 64:276 1:1
88 2560x1080p 29.97Hz/30Hz 64:276 1:1
89 2560x1080p 50Hz 64:276 1:1
90 2560x1080p 59.94Hz/60Hz 64:276 1:1
91 2560x1080p 100Hz 64:276 1:1
92 2560x1080p 119.88/120Hz 64:276 1:1

113 2560x1080p 47.95Hz/48Hz 64:276 1:1

...

86 2560x1080p @ 23.98Hz/24Hz No Repetition No
87 2560x1080p @ 25Hz No Repetition No
88 2560x1080p @ 29.97Hz/30Hz No Repetition No
89 2560x1080p @ 50Hz No Repetition No
90 2560x1080p @ 59.94/60Hz No Repetition No
91 2560x1080p @ 100Hz No Repetition No
92 2560x1080p @ 119.88Hz/120Hz No Repetition No

113 2560x1080p @ 47.95Hz/48Hz No Repetition No

86-92, 113 1080 Progressive 2560 x 1080 1 – 2560 - - 1 – 1080

Using the standard Windows program regedit.exe
you can find the registry key

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAY

in it to find your display and in "Device Parameters" EDID.
Windows 11 already gives a full multi-block EDID and export to a file.
Or use the capabilities of standard display shells of other video card manufacturers.

You can read the EDID of the monitor with software as follows:

https://docs.microsoft.com/en-us/windows/desktop/wmicoreprov/wmigetmonitorraweedidv1block-wmimonitordescriptormethods

You can then analyze the modes mentioned in it in the timing descriptors, for example, using online edidreader.com
or other programs.
As noted by Intel Consumer Support in response to a similar question, timings are not specific to the interface.
The information for the timings of the display must be in CTA-861-G, EDID, DisplayID of display or
as usual for the display in the Drivers:

If this is your display

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

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

DRIVER & SOFTWARE
Standard Monitor Driver Signed Windows 10 x64
Standard Monitor Driver Signed Windows 10 x86
Standard Monitor Driver Signed Windows 7
Standard Monitor Driver Signed Windows 7 x64
Standard Monitor Driver Signed Windows 8 x64
Standard Monitor Driver Signed Windows 8 x86
Standard Monitor Driver Unsigned Windows
Standard Monitor Driver Unsigned Windows x64
ViewSplit Software & User Guide for Windows

In the days of analog displays, you could see that the quality of the image on the same display depends on
from video adapter and cable and more solid and thick cables give better image and can have
longer length. Also HDMI cables - compared to 5 ft 10 ft even thicker than standard computer cables
power cables and their softness can be concluded about a slightly different technology used. In any case, included
display cable must ensure normal display functioning in all modes unless otherwise specified.
There are 2 ft cables.

Signal propagation in high-speed HDMI interface is significantly different from standing wave mode and the same
potential along the entire line of low-speed signals. At 18Gb/s and a speed per one differential line 6Gb/s, there are 5 half-waves along the 5ft cable.

There are also "Fiber Optic HDMI Cables".

Alx24.

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

AndrewG_Intel — Wed, 20 Oct 2021 19:07:27 GMT

Hello dapxe,

Thank you for your response and for the reports.

Please allow us to review further this behavior and the information and we will be posting back in the thread as soon as more details are available.

Best regards,

Andrew G.

Intel Customer Support Technician

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

Alx24 — Sun, 24 Oct 2021 05:54:40 GMT

At resolution from EDID of displays HDMI 1.4: 2560x1440 @ 75Hz Pixel Clock: 301.85MHz compared to the maximum resolution of HDMI 2.0b: 3840x2160 @ 60Hz with Pixel Clock: 594MHz pixel frequency "Pixel Clock" with a large margin is half as much, and twice the working conditions of the entire video system. In HDMI 2.0b, many new significantly higher resolutions and frequencies, for example, 2560x1600, 2560x1920, 2560x2048, 3840x2160, 4096x2160, and some of the previous ones in HDMI 1.4 may well have been temporarily or permanently affected by the appearance of a significantly updated HDMI 2.0b in the Intel Core 11 Generation Graphics , although 2560x1440 @ 75Hz are very clearly described in the EDID of displays presented in the responses.

Alx24.

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

Alx24 — Tue, 26 Oct 2021 01:57:24 GMT

While this topic is in the process of thinking about the answer at Intel Corp. it can also be assumed that
Frequency "Pixel Clock: 301.85MHz" in DTD from presented in Report.txt Raw EDID for 2560x1440 @ 75Hz mode

Detailed Timing Descriptor
Pixel Clock: 301.85MHz
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

with a huge margin fit into the frequency capabilities of HDMI 2.0b of Intel Graphics of Core 11 Generation is still very close to "Max TMDS Clock Rate: 310 MHz" in "Vendor Specific Data Block HDMI 1.4" of this display in EDID and can be deviated.

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

In a 4K display, there can be a much higher frequency here:

Vendor Specific Data Block HDMI 1.4
...
Max TMDS Clock Rate: 600 MHz
...

Still, the goal when working on the current Windows is to increase the stability of its work.
It is also possible to influence this:

https://docs.microsoft.com/en-us/windows-hardware/drivers/display/overriding-monitor-edids

"Manufacturer override of monitor EDIDs"

Alx24.

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

dapxe — Sat, 30 Oct 2021 01:53:35 GMT

Hello Andrew G

A long time has passed.
Is my problem still supported by you?

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

AndrewG_Intel — Sat, 30 Oct 2021 06:08:23 GMT

Hello @dapxe,

Thank you for your patience in this matter

We have tested this internally and we did a lab using the following hardware and software:

Windows* 11
Graphics Driver: 30.0.100.9955
Graphics Controller: Intel® UHD Graphics 750
Intel® Core™ i7-11700K Processor
Connection: DisplayPort* (DP) to DisplayPort and HDMI* to HDMI tested.

Results:

We were able to achieve the resolution 2560x1440 @75Hz using HDMI to HDMI and with DP to DP we were able to use 2560x1440@120Hz and 144Hz.

Please check the 2 videos attached.

We can discard the 11th gen processor or the Intel® UHD Graphics 750 as the limitation. Our processor/graphics card is capable to support the desired resolution. In this case, our recommendation is to confirm either with the computer/motherboard manufacturer (OEM) or the monitor manufacturer to confirm their capabilities and to debug further the issue with them. As mentioned in a previous post, 2560x1440 at 75Hz could be "possible" over HDMI 1.4 but may be limited by other factors.

Best regards,

Andrew G.

Intel Customer Support Technician

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

dapxe — Sun, 31 Oct 2021 13:37:43 GMT

Hello Andrew G

Thank you for spending 10 days researching and figuring out how to solve my problem.

Regarding the test you took, I found the following inconsistent and unclear points:
- The hardware and software you use are not compatible with my hardware and software.
- I noticed inconsistency in 2560x1440-75Hz video. In this sketchy video you don't get to show that the monitor is connected to the graphics card via HDMI or DP. Connection to a monitor via HDMI 1.4 or HDMI 2.0 is not shown.
- My problem is the connection of the UHD-750 integrated in the i5-11500 to the 2560x1440@75hz monitor via HDMI 1.4 and not other problems.

So the test you did and your conclusion is not suitable for my problem.

I suggest you redo the 2560x1440-75Hz video more fully, showing all the necessary parameters proving that the UHD-750 connected to the monitor via HDMI 1.4 working at 2560x1440@75hz and using the i5 11th generation.

Extend:
During the 10 days waiting for your results, I tested my monitor connecting to UHD-630, UHD-610, UHD-605 through HDMI 1.4. The results are all working at 2560x1440@60hz but not 2560x1440@75hz. Can you reply on this?

I have read this information on the internet:
Link: https://www.dell.com/support/kbdoc/en-ed/000187882/unable-to-select-75hz-for-qhd-2560-1440-resolution-on-dell-s2722dc-monitor?lwp=rt
Please rate this information.

Best regards.

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

Alx24 — Sun, 31 Oct 2021 16:35:18 GMT

This testing is a very important step in clarifying the properties of Intel Corp video adapters.
which, along with the drivers, were unusually friendly.

And there were also similar questions and answers:

https://community.intel.com/t5/Graphics/Intel-HD-620-1440P-amp-75hz/m-p/1212088#M90095

and numerous questions and apparently not all:

https://community.intel.com/t5/Graphics/Core-i3-1005G1-HDMI-2560x1440-resolution/td-p/1316210

https://community.intel.com/t5/Graphics/Intel-UHD730-doesn-t-display-2k-75Hz-on-external-monitor/td-p/1317360

https://community.intel.com/t5/Graphics/Intel-UHD-620-1440P-amp-75hz/m-p/1323207#M101882

In file "Screenshot 3.png" there is an arrow in the Refresh Rates drop-down list so there should be several frequencies as usual
when the frequencies are all possible for a given resolution, three frequencies as in EDID and here one minimum frequency.

It would be terribly interesting to compare the EDID of a monitor successfully tested in Intel Corp. and the Raw EDID data from the submitted file "Report.txt". Send it if possible, please.

You can approach the graphic parameters from the other side through "Settings" Windows, "System", "Display" in it, then sequentially follow the blue links "Advanced Display Settings", "Display Adapter Properties for Display 1" with the call of the standard Windows dialog of the properties of the video adapter together with the monitor and in it "List All Modes", in which you can see all the modes from where you can select the desired mode. In this dialog there is "Monitor" tab with combobox "Screen refresh rate:"
and checkbox "Hide modes that this monitor cannot display", and buttons "Apply".

If you take a 75Hz display and processors, for example, starting with the Z2760 with intel GMA, the driver is always friendly to the 75Hz frequency if it is permissible for this display, even if this mode is not described in detail in the EDID as in the analyzed monitors x 2560x1440

Timing Bitmap
720×400 @ 70 Hz
720×400 @ 88 Hz
640×480 @ 60 Hz
640×480 @ 67 Hz
640×480 @ 72 Hz
640×480 @ 75 Hz
800×600 @ 56 Hz
800×600 @ 60 Hz
800×600 @ 72 Hz
800×600 @ 75 Hz
832×624 @ 75 Hz
1024×768i @ 87 Hz
1024×768 @ 60 Hz
1024×768 @ 72 Hz
1024×768 @ 75 Hz
1280×1024 @ 75 Hz
1152x870 @ 75 Hz

U5.jpg is typical "List All Modes"

For information: 300 MHz * 24bpp = 7.2GHz but 2560x1600 @ 75Hz no longer fall into the HDMI 1.4 range.

Here is "Processor: 11th Gen Intel(R) Core(TM) i5-11500 @ 2.70GHz"

The most detailed information about processors can be found here:

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

Desktop - Rocket Lake

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

Mobile - Tiger Lake

https://cdrdv2.intel.com/v1/dl/getContent/631121

File: "A1.jpg" is table "Display Resolutions and Link Bandwidth for Multi-Stream Transport Сalculations"

which is stored in this form from the second generation Core with the addition of new lines for new processors and almost everywhere one
frequency 60Hz.

This reflects the fact that the 60Hz frequency of the LCD screen is determined by its technology and is the same regardless of the
resolution.

In CRT monitors, the raster points were illuminated when they were hit by a point electron beam of the drawing

raster and immediately began to fade when the transition of the electronic beams to the following

pixels - the points of the raster and the observed picture on the screen depended on the afterglow of the phosphor and frequency.

Given the peculiarities of human vision, the basic frequency VESA considered 60Hz, at which people

with low inertia vision was noticeable flickering screen a ergonomic 73Hz, 75Hz and

towards the end of the CRT era, even 85Hz frequencies figured.

In LCD pixels are translated into some state and remain in it until the next state change,

therefore, much lower frequencies like 23Hz are acceptable for them.

This table shows the interface speeds and shows that 2560x1440 75Hz

Pixel Clock: 301.85MHz * 24bpp ~ 7.2Gb/s but the next 2560x1600 is already higher - 8.06Gb/s

In general, 8Gb/s had a very large margin and then very quickly increased frequencies to 18Gb/s, 48Gb/s - with the addition of only one line.

In this table, life with a frequency of more than 60hz does not become directly impossible, there are pros and cons in this there is a
simplification and unification. Throughout the documentation core graphics 60Hz, it would be difficult for each resolution to set a limit

frequency.

In the very appreciated and beloved "CTA-861-G" in accordance with the features of the LCD there is Low, 50Hz, 60Hz, then 100Hz, 120Hz, 200Hz, 240Hz.

It has the date "November 28, 2017" and the common format 2560x1440 managed to appear frequency of 75Hz within HDMI 1.4.

Meanwhile, Microsoft Corp. is releasing the Surface with 120Hz screens.

Monitors with HDMI 1.4 have such block in EDID

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

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

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

and HDMI 2.0 moniors have two blocks and much higher frequencies

If the monitor supports HDMI 2.0, then it has two blocks with a much higher TMDS frequency, for example:

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

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: 600 MHz
////////////////////////////////////////////////////////////////////////////////
Video/Audio Latency Fields Present

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

Vendor Specific Data Block HDMI 2.0
IEEE OUI: C45DD8
Version: 1
////////////////////////////////////////////////////////////////////////////////
Max TMDS Clock Rate: 600 MHz
////////////////////////////////////////////////////////////////////////////////
Supports SCDC
Supports SCDC Read Request
Supports Scrambling for less <=340MHz
Supports 3D Independent View
Supports 3D Dual View
Supports 3D OSD Disparity
Supports 30 bits/pixel (10 bits/color) for Deep Color YCbCr 4:2:0
Supports 36 bits/pixel (12 bits/color) for Deep Color YCbCr 4:2:0
Supports 48 bits/pixel (16 bits/color) for Deep Color YCbCr 4:2:0

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

Returning to the monitor on which the question is asked - it fully details the frequencies for 2560x1440 60Hz, 75Hz.

Its EDID details the 60Hz and 75Hz frequency for the maximum resolution of this monitor.

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

60 Hz

Detailed Timing Descriptor
////////////////////////////////////////////////////////////////////////////////
Pixel Clock: 241.5MHz / 60 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)

(241500000 / (2560.0 + 160)) / (1440 + 41) = 59.950550105255

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

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

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

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

In the file ssu.txt in "Display" in accordance with this, the frequencies that should be present in the drop-down
"Refresh Rate" list:

Refresh Rate - Current:"59 Hz"
Refresh Rate - Maximum:"75 Hz"
Refresh Rate - Minimum:"50 Hz"
Resolution:"2560 X 1440"
Scan Mode:"Noninterlaced"

and in "Settings", "System", "Display" blue link "Advanced Display Settings", "Display Adapter Properties for Display 1" with the call of the standard Windows dialog of the properties of the video adapter together with the monitor in tab "Monitor" with combobox "Screen Refresh rate" and checkcbox "Hide modes that this monitor cannot display"

In File "ssu.txt"
////////////////////////////////////////////////////////////////////////////////
Dedicated Video Memory:"Not Available" - I would like to ask if it is used now and how important it is.
////////////////////////////////////////////////////////////////////////////////

Previously, it was used and for HD was 32-64MB and 128MB for UHD and it could be changed in the section "Video" of BIOS.

It was absent at Microsoft's universal base graphics driver.

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

OEM's can take completely unexpected steps, including in the field of graphics
and detailed information about this is very difficult to obtain, for example:

"Zenbook Flip 13 (UX363, 11th gen Intel)" - "1x HDMI 1.4"

https://www.asus.com/Laptops/For-Home/ZenBook/Zenbook-Flip-13-UX363-11th-gen-Intel/techspec/

...

Processor
Intel® Core™ i7-1165G7 Processor 2.8 GHz (12M Cache, up to 4.7 GHz, 4 cores)
Intel® Core™ i5-1135G7 Processor 2.4 GHz (8M Cache, up to 4.2 GHz, 4 cores)

Graphics
Intel Iris Xᵉ Graphics (available for Intel® Core™ i5/i7 with dual channel memory)

I/O Ports
1x USB 3.2 Gen 1 Type-A
2x Thunderbolt™ 4 supports display / power delivery
////////////////////////////////////////////////////////////////////////////////
1x HDMI 1.4
////////////////////////////////////////////////////////////////////////////////

...

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

Of the steps you can take, there may be any changes to the settings in the registry.

It is professionally recommended to address this question to another authority in this case OEM after studying, on which a lot depends here.

Alx24.

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

Alx24 — Mon, 01 Nov 2021 12:39:11 GMT

There's just been criticism of ASUS being doing weird things going back to HDMI 1.4.
but they can also implement useful expected and thoughtful solutions.

https://www.asus.com/Displays-Desktops/Mini-PCs/PN-PB-series/Mini-PC-PN80/\

...

High-speed connectivity: Dual Thunderbolt 4, HDMI 2.1,

...

HDMI 2.1 is solution for modern 8K TV.

Alx24.

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

Alx24 — Tue, 02 Nov 2021 11:24:24 GMT

Taking this opportunity, it is pleasant to note that according to the basic documentation:

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

containing, among other things, variants of the table in attachment A1.jpg above,

starting with 5th Generation Intel Core supports 4K resolution:

HDMI 4096x2304 at 24 Hz/2560x1600 at 60 Hz ( HD Graphics 4xx )

Alx24.

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

dapxe — Tue, 02 Nov 2021 13:37:04 GMT

Hello Andrew G

It's been 3 days since I posted. I still have not received a reply from you. So I repost and wait for your reply. I hope you will reply soon.

Best regards

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

Hello Andrew G

Thank you for spending 10 days researching and figuring out how to solve my problem.

So the test you did and your conclusion is not suitable for my problem.

Best regards.

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

Alx24 — Tue, 02 Nov 2021 15:50:19 GMT

Starting with Intel Core 5th Generation is guaranteed, as noted above according to the documentation

HDMI 4096x2304 at 24 Hz/2560x1600 at 60 Hz ( HD Graphics 4xx )

but 2560x1440 at 75 Hz - nowhere yet provided or regulated, but in Intel Core 11 Generation with physically much more performance chip's
graphics HDMI 2.0b, finally, this question can be considered in a slightly different way and is quite easily solved definitively, because
the microprocessor itself has twice the performance in HDMI 2.0b as before in HDMI 1.4 and really has nothing to do with this problem.

Alx24.

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

AndrewG_Intel — Tue, 02 Nov 2021 19:53:55 GMT

Hello dapxe

Thank you for your response.

We tested this using the same Graphics controller Intel® UHD Graphics 750, and based on the processor specifications for Intel® Core™ i5-11500 Processor, the resolution is supported. However, we will review if there are more details we can provide. We will be posting back as soon as more information is available.

Best regards,

Andrew G.

Intel Customer Support Technician

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

Alx24 — Wed, 03 Nov 2021 04:22:53 GMT

Starting with Intel Core 5th Generation is guaranteed, as noted above according to the documentation

HDMI 4096x2304 at 24 Hz/2560x1600 at 60 Hz.

For modern Intel Core 11th Generation in the documentation ( table in attachment A1.jpg )

for 4096x2304 is guaranteed HDMI 1.4 more high frequency of 30Hz (+25% compared to 24Hz), so for

the accompanying resolution value of 2560x1600 increase in frequency +25% to 60Hz would mean exactly the frequency of 75Hz, and here is
discussed even much lower resolution at this frequency - 2560x1440 at 75Hz.

Alx24.

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

Alx24 — Wed, 03 Nov 2021 12:40:21 GMT

In your link https://www.dell.com/support/kbdoc/en-ed/000187882/unable-to-select-75hz-for-qhd-2560-1440-resolution-on-dell-s2722dc-monitor?lwp=rt

there is another modern way to solve this problem, such as using "Accell USB-C to HDMI 2.0 4K @60Hz" or others.

Alx24.