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

YUKW · ‎09-22-2025

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 · ‎09-22-2025

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 · ‎09-24-2025

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 · ‎09-25-2025

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

MUC · ‎09-25-2025

Samsung Odyssey Neo G9 (G95NC) – user manual attached

7680 x 2160 @ 240 Hz (pixel clock: 4233.6 MHz)

7680 x 2160 @ 120 Hz (pixel clock: 2224.75 MHz)

Lenovo ThinkPad X1 Carbon Gen 13

1 x HDMI TMDS (aka HDMI 2.0)

2 x Thunderbolt 4 (with DisplayPort Alternate Mode HBR3 w/ DSC)

For optimal operation, this monitor requires a signal with Display Stream Compression (DSC). While the included EDID indicates DSC capability, the docking station's "8K@30 Hz" HDMI specification could mean that it may not support DSC. The laptop's HDMI port doesn't either.

Just connect one of your laptop's Thunderbolt 4 ports to your monitor's DisplayPort input.

Please use one of the following cables. The connection will then be operated with the DisplayPort 1.4a HBR3 protocol w/ DSC:

The total available bandwidth will probably not be sufficient for 240 Hz, but 120 Hz should not be a problem:

7680 x 2160 @ 120 Hz >>> 2224.75 MHz = 206 % HBR3 … with DSC = OK

MUC · ‎09-25-2025

If you're keen to experiment, you can also test whether Lenovo can keep its word on its technical specifications:

2 x USB-C (Thunderbolt 4 / USB4 40Gbps), with USB PD 3.0 and DisplayPort 2.1

If Lenovo fully utilizes the processor's capabilities with a corresponding retimer on the printed circuit board, then UHBR link rates according to DisplayPort 2.1 are also available in DisplayPort Alternate Mode according to the processor's specifications (page 152):

DPx4 means that 4 lanes are used for the video signal. This would lead to:

UHBR10 (4 x 10 Gbps): 7680 x 2160 @ 240 Hz >>> 4233.6 MHz = 266% UHBR10 ... with DSC = OK

UHBR20 is not supported by the monitor.

If you want to try this, set the refresh rate to 240 Hz in the monitor's On Screen Display (OSD).
Game → Refresh Rate → 240 Hz
For details, please refer to the user manual.

Use this cable then:

Club 3D CAC-1563 USB-C to DisplayPort 2.1 DP54 Bi-Directional Cable 2 m