UHD vs IRIS problem

[kevinphp]

I have a strange issue between two HP laptops... I have had a 17.3" HP i3-1125G4 with UHD graphics for over a couple of years now, and it works flawlessly using the HDMI port and the monitors I have in my office. Even with the Gygabyte G34WQC A, it will display at 3440 x 1440 without issue.  

I have just purchased a newer version of the same HP laptop with an i5-1334U processor and Intel Iris Xe. Both laptops are from the same series and have the same port, layout, etc. BOTH have an HDMI 1.4b connector. Both laptops' internal displays have the same resolution.

However.... I sat down with the newer laptop, plugged in the Gygabyte monitor, and the highest resolution it offers me is 1920 x 1080 @ 60Hz, but the older i3 with UHD graphics gives me 3440 x 1440 @ 60Hz. Same cable, same port on the monitor, both laptops have HDMI 1.4b ports. 

I have tried the latest HP-provided Intel driver and the latest (and three previous) versions of the Intel driver, and the issue persists. I also have a Dell SE3223Q monitor where the same problem happens. The older i3 with UHD graphics runs the monitor at its default resolution, but the new i5 with Iris will only display 1920 x 1080. The minimum refresh rate offered on both monitors I mentioned is 50Hz in Windows Display settings.

I have access to an  LG 34WN80C-B which is the same resolution as the Gygabyte monitor, which the newer i5 with Iris can drive at 3440 x 1440 but at 29.99Hz refrsh rate, but the i3 drives this monitor at 30Hz. I am unclear why that lower refresh rate is available on the LG and not the other two mentioned.

Any guidance would be appreciated

[kevinphp]

I meant to say in the last paragraph the i3 drives that monitor at 60Hz

[RandyT_Intel]

Hi @kevinphp,

Thank you for posting in the community. Here are my observations based on the setups you shared:

First System

• Laptop: 17.3" HP with Intel® Core™ i3-1125G4 and UHD Graphics
• Cable: HDMI 1.4b
• Monitor: Gigabyte G34WQC A
• Resolution: 3440 × 1440 @ 60Hz

Based on my calculations, the required bandwidth is approximately 7.51 Gbps, which HDMI 1.4b can handle without issue.

Second System

• Laptop: HP with Intel® Core™ i5-1334U and Intel® Iris® Xe Graphics
• Cable: HDMI 1.4b
• Monitor: Gigabyte G34WQC A
• Resolution: 1920 × 1080 @ 60Hz

Here, the required bandwidth is about 3.20 Gbps, which is also well within HDMI 1.4b capability.

Regarding your test with the Dell SE3223Q, you mentioned the minimum refresh rate was 50Hz. However, when using the LG 34WN80C-B (same resolution as the Gigabyte monitor), Iris Xe could drive 3440 × 1440, but only at 29.99Hz, while the i3 system achieved 60Hz.

This suggests the issue is likely related to monitor-specific EDID compatibility. Please note that this is an OEM device, so while we can assist with general troubleshooting, if the issue persists, you may need to contact your device manufacturer. OEM's often customize components for better system compatibility.

To analyze further, please provide:

1. SSU log reports for both laptops (refer to this article).
2. Exact make and model of both laptops.
3. EDID reports for each setup for comparison.
4. Have you tried using a higher HDMI version (e.g., 2.0 or 2.1)? According to the monitor specifications, HDMI 2.0 is recommended for optimal performance. The same applies to Dell and LG monitors.

To generate IGCC report for EDID analysis, please follow the steps below:

1) If IGCC is not yet install on the Windows system, download and install the "Intel® Graphics Command Center" from the Microsoft Store.

2) Once installed, launch the Intel® Graphics Command Center (IGCC) software.

3) On the left side of the app, click on "Support" and then on top click "System Diagnostic"

4) To the right, click on "Generate Report" and you will be prompted to save it as a txt file.

5) Save the report which can be used for analysis.

Looking forward to your response.

Best regards,

Randy T.

Intel Customer Support Technician

[JedG_Intel]

Hello kevinphp,

I wanted to check if you had the chance to review the questions we posted. Please let us know at your earliest convenience so that we can determine the best course of action to resolve this matter.

Best regards,

Jed G.

Intel Customer Support Technician

[RandyT_Intel]

Hi @kevinphp,

Since I haven't heard back from you, I will be closing this thread. 

If you need further assistance, please submit a new thread or post a new issue in our community. 

Thank you. 

Best regards,   

Randy T.   

Intel Customer Support Technician