Missing driver functionality

[Meesam]

Hello,
I have an i5-11320H with an Iris Xe 96EU.
The Linux version of the drivers for the iGPU show support for vulkan extensions related to int64 atomics like shaderBufferInt64Atomics etc.
They work properly as well, however on windows the drivers do not report support for it. Is this expected behaviour? Can we expect to see support on windows as well?

[Roy_Intel]

Hello Meesam,

Thank you for posting on the Intel Community Forum.

Thank you for bringing this technical issue to our attention. You've identified an interesting discrepancy between our Windows and Linux graphics drivers regarding Vulkan int64 atomic operations support on your i5-11320H with Iris Xe 96EU.

To better assist you, could you please provide the SSU (System Support Utility) report, which will give us a clearer view of your system configuration?

You can download the SSU tool from the link below:

How to get the Intel® System Support Utility Logs on Windows*

Important: While generating the SSU report, please ensure that the “Networking” option is unchecked.

Once we receive the above details, we will be able to proceed with the next steps.

Thank you for your patience, and I appreciate you bringing this important compatibility issue to our attention.

Best regards,

Roy

Intel Customer Support Technician

[Meesam]

Thank you for your response.

You can find the report attached.

[Roy_Intel]

Hello Meesam,

Greetings from Intel Customer Support,

Thank you for sharing the SSU report and confirming that the latest graphics driver is installed on your system.

To further investigate the difference in Vulkan int64 atomic extension support between Linux and Windows on your Intel Iris Xe Graphics, we kindly request the following additional details:

• Linux distribution, kernel version, and Mesa version used during testing
• Output of vulkaninfo from both Windows and Linux environments
• Whether the issue is observed only in Vulkan capability viewers/tools, or also during actual application execution
• Name of the application/workload being used for testing
• Any Vulkan validation layer warnings or error messages observed on Windows

Additionally, please let us know if you have tested different Windows graphics driver versions or performed a clean graphics driver installation to verify whether the behavior changes.

Once we receive these details, we will continue reviewing the behavior further.

Thank you for your cooperation.

Best Regards

Roy

Intel Customer Support Technician

[LohithG]

Hello Meesam,

I am writing to follow up on our previous message regarding the Vulkan int64 atomic extension behavior on your system.

Could you please let us know if you have had the opportunity to review our request for additional details? The system environment information and vulkaninfo logs are essential for us to properly investigate and replicate the issue you are experiencing.

If you require any assistance with gathering this data, please do not hesitate to ask. We are here to help.

Best Regards,

LohithG

Intel Customer Support Technician

[Meesam]

Sorry for the late response.

The testing was done on:
Fedora Linux 44 (Workstation Edition)
Kernel 6.19.10-300.fc44.x86_64
Mesa 26.0.3

Output of vulkaninfo from both Windows and Linux attached.

I first noticed this in vulkaninfo then tested it using the following program:
https://github.com/meesam4687/atomic

On Linux the program executes everything successfully, on windows it fails and reports no support for the said features.

[Roy_Intel]

Hello Meesam,

Greetings from Intel Customer Support.

Thank you for sharing the additional details regarding your query.

We would like to inform you that we are currently reviewing the details of your inquiry internally. Kindly allow us 24 to 48 business hours to investigate your question further.

We will get back to you with an update as soon as possible.

Thank you for your patience and understanding.

Best regards,

Roy

Intel Customer Support Technician

[Roy_Intel]

Hello Meesam,

Greetings from Intel Customer Support.

Thank you for your patience while we investigated the behavior you reported.

After reviewing the issue, we would like to inform you that Intel Iris Xe Graphics does not provide full hardware support for int64 atomic operations.

To maintain compatibility with translation layers such as Proton, VKD3D, and DXVK, Mesa uses the

nir_lower_int64_atomics

implementation to emulate int64 atomic operations in software. This helps provide broader application compatibility; however, it may also introduce some performance overhead.

At this time, this behavior is considered expected and there are no planned changes for this functionality in the near future.

Additionally, please note that this product has transitioned to a legacy software support model. As a result, Intel software updates for this platform will be limited to critical fixes and security vulnerability updates only.

For more information regarding the legacy software support model, please refer to the following article:

Intel Graphics Driver Support Update Information

Please let us know if you have any additional questions or concerns. We will be glad to assist you further.

Best regards,

Roy

Intel Customer Support Technician