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PStJo
Beginner
817 Views

HD Graphics 630, secondary monitor refresh rate limited by primary monitor?

Hi,

 

I have a Win10 LTSC 2019 system with i7-7700 processor and HD Graphics 630 GPU. I'm trying to run two monitors at 1920x1080 with the primary set to 60Hz and the secondary to 120hz.

 

I'm finding the secondary monitor is limited by the refresh rate of the primary (i.e., both are running at 60Hz) despite setting the display configuration to 120Hz for the secondary monitor. The secondary is connected to the DP port and the primary to the DVI-D port. If I swap primary/secondary then I can get 120Hz on the one monitor, but these monitors are part of a larger system and it is really desirable to have the secondary one at 120Hz.

 

I'm looking at using an MST hub to alleviate the issue - but am not completely confident that will fix it for me.

 

Trying to avoid going to a discreet card as this has implications on EMC certification, regulatory approvals, testing & support as well as long-term peripheral availability.

 

Specific Questions:

1) Should the secondary monitor refresh be capped by the primary?

2) Is there some configuration options I've missed to allow a higher refresh rate on the secondary?

 

Thanks,

Paul.

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7 Replies
Leonardo_C_Intel
Moderator
342 Views

Hello PStJo Thank you for posting in the Intel Community. Allow me to share with you that the Intel® HD Graphics 630 only supports HDMI® 1.4 DP and eDP (Integrated Flat Panel), Between the DVI-D port on the motherboard and the Intel® processor at least there is one video converter integrated on the motherboard (please confirm the information with the motherboard manufacturer). As I can see based on the information provided you have two identical monitors and if you swap the connection (primary to secondary) the reported issue follows the DVI-D connection. If this is correct absolutely the problem is related to the DVI internal video converter (port). If I am wrong please provide with the data that I am missing (models of the displays, hardware details). • In order to help you better, I would like to gather more information about the configuration you have on the computer. Please attach to this thread the TXT file the Intel® System Support Utility will generate: https://downloadcenter.intel.com/download/25293/Intel-System-Support-Utility • Steps to save the report: 1- Run the utility. 2- Click on “Scan” to get the scanned system. 3- Once the scan is complete click on “next”. 4- Use the “save” option, save the report to your desktop. 5- To attach a file, you must click the “Attach” option on the bottom left-hand corner of the response box. Hope this helps. Regards, Leonardo C. Intel Customer Support Technician Under Contract to Intel Corporation
PStJo
Beginner
342 Views

Hi Leonardo,

 

Thank you for your reply. Please find the file you requested attached to this message. You are correct that there is a video conversion to get the DVI-D. It is sourced from the HDMI and on the AIMB-505 from Advantech is limited to a max resolution of 1920x1080 @ 60Hz.

 

The two monitors are not identical. one is the ASUS VG248 and the other the ASUS VG279. Note that these are just the monitors I happen to be testing with as they are capable of 120Hz, and not the monitors we would necessarily deploy our product with.

 

I would not characterize the issue I'm having as 'following' the DVI. Rather, the secondary monitor's refresh rate is limited (capped) by whatever the primary monitor's refresh rate is. This is true regardless of which monitor is primary and whether the primary is using DP or the converted DVI. For example:

 

Primary monitor on DVI set to 1920x1080 @ 60Hz. Set secondary monitor (on DP) to 1920x1080 @ 120Hz. Refresh rate on secondary monitor is capped at 60Hz.

Primary monitor on DVI set to 1280x1024 @ 75Hz. Set the Secondary monitor (on DP) to 1920x1080 @ 120Hz. Refresh rate on secondary monitor is capped at 75Hz.

Primary monitor on DP set to 1920x1080 @ 50Hz. Set the secondary monitor (on DVI) to 1920x1080 @ 60Hz. Refresh rate on secondary monitor is capped at 50Hz.

 

Refresh rates were checked using 3 methods but the 2 main ones were testufo.com and an in-house system that uses a photo-diode measurement of an avatar drawn to the screen.

 

Our desire (nay, expectation) was that we would be able to drive a secondary monitor connected to the Display Port at 120Hz without going to a discrete card.

 

Any suggestions you can offer to achieve our objective is appreciated (I have an MST Hub on order and will be trying it next week).

 

Best regards,

Paul.

Leonardo_C_Intel
Moderator
342 Views

Hello PStJo Thank you for the information. With the information that you are providing the refresh rate limitation that you are facing seems to be a hardware limitation, since VGA - DVI connectors are limited by Motherboard Original Equipment Manufacturer OEM to up to 1920 x 1200 at 60 Hz, In this case, I recommend contacting the Motherboard manufacturer (Advantech). Reference link: https://www.advantech.com/contact Bear in mind that the Intel® Core™ i7-7700 Processor on your system can support the following resolution and refresh rates: • Max Resolution (HDMI 1.4): 4096x2304@24Hz • Max Resolution (DP): 4096x2304@60Hz • Max Resolution (eDP - Integrated Flat Panel): 4096x2304@60Hz Reference link: https://ark.intel.com/content/www/us/en/ark/products/97128/intel-core-i7-7700-processor-8m-cache-up-... Hope this helps. Regards, Leonardo C. Intel Customer Support Technician Under Contract to Intel Corporation
PStJo
Beginner
342 Views

Hi Leonardo,

 

I have/had no expectation that the VGA-DVI connected monitors would do anything but be limited to the maximum specified by Advantech. I was surprised to find that the primary monitor's refresh rate was a cap on the refresh rate for the secondary monitor. I do not know what (or who) is causing the cap. I can get 120Hz as long as the monitor on the DP connection is set as the primary.

 

Yesterday I received a MST Hub and found that if I connect *both* monitors to the DP connection that the refresh rate of the primary still limits the refresh rate of the secondary. I.e., Both monitors on DP, primary set to 60Hz, secondary set to 120Hz and I still only get 60Hz on the secondary. On the positive side, I have found that I can set both the primary and secondary to 1920x1080 @ 120Hz when using the MST hub and I do, in fact, get 120Hz on both. Now I still need to dive into a latency that seems too high and figure out why the occasional frame is being dropped... but that's another story.

 

Regards,

Paul.

Leonardo_C_Intel
Moderator
342 Views

Hello PStJo I am glad to hear that you have been able to set both displays at 1920x1080 @ 120Hz. Yes, the VGA DVI converter on the motherboard build can cause a limitation on the video output, now the MST HUB can cause this behavior that you are experiencing now, you can try making sure that the system is up to date (Original Equipment Manufacturer drivers and graphics drivers) and Windows updates. Regards, Leonardo C. Intel Customer Support Technician Under Contract to Intel Corporation
PStJo
Beginner
342 Views

Hi,

 

The problematic behaviour (the refresh rate set for the primary monitor creates a refresh rate limit on the secondary monitor) is the same regardless of whether the DVI connection (converted from HDMI) is used for the primary monitor, the secondary monitor or completely avoided by using DP for both monitors through the use of a MST hub. It seems far more likely that a common component is the cause of the problematic behaviour under these various conditions.

 

Last week I had updated OS and, after encountering the issue, updated to the latest video drivers.

 

Thank you for your time,

Paul.

Leonardo_C_Intel
Moderator
342 Views

Hello PStJo Yes, the behavior is related to the converter/adapters in between the processor and the display, as mentioned previously this can be because of the video converter on the motherboard or the adapters used on the DP, therefore at this point the best thing to do is referring to the motherboard manufacturer or the adapter manufacturer for suggestions about this behavior. Regards, Leonardo C. Intel Customer Support Technician Under Contract to Intel Corporation
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