Lunar Lake+Dock unable to output 8K Display on Win11 but works on Linux

[YUKW]

Hi,

I have a Thinkpad X1 Carbon Gen 13 laptop with Core Ultra 268V and Arc 140V graphics. I am trying to connect to Samsung Neo G9 57 (7680x2160) Display through Amazon Basics Thunderbolt4/USB4 Pro Docking (HDMI 2.1 output supports up to 8K30Hz) like so:

Laptop -> Thunderbolt 4 Dock -> Neo G9 57 Display

On ArchLinux with Kernel 6.17.6, I am able to to output with the native resolution 7680x2160 at 59.99Hz. Please see my screenshot and EDID decode as attached.

However, on Windows 11, I am unable to select the native resolution 7680x2160, only up to 5120x1440. Please see my screenshot below and EDID export from CRU as attached. I am also using the latest available Intel Graphics Driver 32.0.101.7029.

[PatrickV_Intel]

Hi YUKW,

Thank you for reaching out to the Intel Community Forum. To assist us in investigating the issue, please provide the following details:

• May I know if you are using the same laptop with Windows OS and Linux?
• Have you tried to connect the external monitor directly to laptop?
• Have you tried using the OEM driver for testing?
• Have you used Display Driver Uninstaller (DDU) to completely remove all residual drivers and installed a new one?

Additionally, to gain a comprehensive understanding of your system, please use the System Support Utility (SSU). This tool will generate a text file compiling all your system information. You can follow the instructions at this link and send the text file here. Help Guide for the Intel® System Support Utility.

If you have any questions, please let us know. Thank you.

Best regards,

Patrick V.

Intel Customer Support Technician

[YUKW]

Yes, I am using the same laptop in both Linux and Windows.

I have previously tried connecting the external monitor directly to laptop's HDMI port, but the max resolutions remain the same. That's why I am trying to use the dock.

I have also just used DDU to uninstall display drivers and revert back to Lenovo Thinkpad's driver 32.0.101.6326, but the results are the same.

[PatrickV_Intel]

Hi YUKW,

To help troubleshoot this further, could you please confirm if you've tried the following steps:

• Update dock firmware - Check if your dock firmware is current by visiting the manufacturer's support website for any available updates.
• Update system BIOS - Ensure your system BIOS is running the latest version from your computer manufacturer.

If you've already completed both updates and the issue persists, this may indicate a system compatibility issue with your specific hardware configuration.

Since this is an OEM product, if the problem continues after trying these troubleshooting steps, I'd recommend contacting your system manufacturer (OEM) directly for further assistance. They'll have specialized knowledge of your hardware setup and can provide targeted support for any compatibility concerns.

If you have any questions, please let us know. Thank you.

Best regards,

Patrick V.

Intel Customer Support Technician