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.