dGPU missing on reboot

[Dimonor]

GPU = Intel Arc B580
OS = Ubuntu server 26.04

When I go from full power off, to power on (even without drivers installed), my GPU prides a video output.
However when I reboot, there is no video output any more, and the GPU is not detected.
The OS is booted (I can SSH into it), but the GPU is not detected.

It occurs ever boot,.

Bios version is at the latest.

[Ramgound_Intel]

Hello Dimonor,

Thank you for posting on Intel Community Forum and for providing such a detailed description of the issue. We completely understand how frustrating this must be, and we want to assure you that your concern is being taken seriously. We are committed to getting this resolved for you.

To summarize our understanding of the issue:

• Your Intel Arc B580 GPU is detected and provides video output on a fresh power on
• However, after a reboot, the GPU is no longer detected and no video output is available
• The OS itself boots successfully and is accessible via SSH
• This occurs on every reboot
• BIOS is updated to the latest version

To help us investigate this further, we have a few questions:

1. Does the issue occur with a warm reboot (sudo reboot) as well as a hard reboot?

Additionally, we kindly request that you provide your SSU logs as this will allow us to review your complete system configuration and help us tailor our troubleshooting specifically to your setup rather than providing generic guidance.

Steps to Generate the SSU Report

1. Download and run the Intel® System Support Utility (SSU).
2. Click Scan.
3. Once the scan is complete, click Next.
4. Select Save and save the report as a .txt file.
5. Attach the SSU report to your response.

Please follow the steps below to collect the SSU report and share it with us at your earliest convenience.

We appreciate your patience and look forward to your response.

Best Regards,

Ramgound

Intel Customer Support Technician

[Dimonor]

Hi,

Before this I have only tried a warm reboot.
Just tested: It does happen with a hard reboot (tested 3 times: from working, hard reboot (button on case wired to the reset switch on the motherboard), OS booted but no GPU out).
Side note: reboot in general seems faster than power on.

Regarding SSU, note I am running Ubuntu Server 26.04, in my case headless, and your instructions are Windows GUI based. But https://www.intel.com/content/www/us/en/support/articles/000008563/ethernet-products.html had the instructions I needed.

I ran SSU while there was a display out ("SSU with GPU detected.txt"), and after a reboot thus without a display signal ("SSU no display out.txt").

Best Regards

[Dimonor]

I found some other weird apparent GPU behavior, specifically a display signal switch effecting if the GPU is detected on boot:

When booting (from cold) the PC with a HDMI cable straight from GPU to the monitor, the system **detects** and uses the GPU.
When booting (from cold) the PC without any HDMI cable the system **detects** the GPU.

But when booting (from cold) the PC with a HDMI switch (set to connect the PC and the monitor) between the PC and the monitor, the system **does not detect** the GPU.
But when booting (from cold) the PC with a HDMI switch (set not connect the PC and the monitor, from other experience I know the PC should be aware it is not connected) between the PC and the monitor, the system **does detect** the GPU, when after boot switching the HDMI switch to connect the PC and the monitor, the monitor claims **not** to have any display signal.

I do **not** really care about the actual display signal.
I do really care about detecting the GPU, since I want to use it for compute.

Best Regards

[Dimonor]

Disregard the last message.

The HDMI switch is powered by the HDMI cable, one of the inserted cables was linked to a powered off system via an HDMI to DVI cable, without that cable connected the GPU is detected every time I boot from cold.

[Ramgound_Intel]

Hello Dimonor,

Thank you for the detailed update and for the additional testing you performed. We appreciate the time and effort you have taken to investigate the behavior and share your findings with us.

We have received your SSU reports from both the working and non-working states, as well as your observations regarding the reboot behavior and the HDMI switch configuration.

We also appreciate the clarification regarding the HDMI switch. It is helpful to know that the issue appears to be influenced by the HDMI switch's power characteristics and the HDMI-to-DVI connection to a powered-off system, and that the GPU is now being detected consistently during cold boots after removing that connection.

At this point, we would like some time to carefully review the information and logs you have provided. We will analyze the SSU reports and the behavior you observed to determine whether any additional investigation or troubleshooting is required.

We appreciate your patience while we review the case. We will get back to you as soon as we have completed our analysis or if we require any further information.

Thank you for your cooperation, and please feel free to share any additional observations if you notice further changes in behavior.

Best Regards,

Ramgound

Intel Customer Support Technician