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Intel Arc A770 PCIe - Speed 2.5GT/s, Width x1

pioto
Beginner
4,314 Views

Hi Intel,

lspci reports PCIe 1.0/x1 for the GPU (56a0) and bridge downstream port (4fa4). The upstream port reports the bandwidth correctly at PCIe4.0/16.

I am running Arc A770 on Ubuntu 22.04 with kernel 5.17.0-1020-oem with all recommended Intel drivers + linux-firmware.git copied over /lib/firmware. Without copying linux-firmware, the system hangs on boot in text mode. I have seen similar tickets about PCIe 1.0/x1, but I decided to raise this one to stress that the bug reproduces for supported installations too.

I suspect a card  firmware issue here so I am not sure about my step of copying over latest linux-firmware.git, If I do not then Ubuntu 22.04 + Arc 770 will not boot into GUI mode.

On the bright the desktop is rendering correctly and is fast, so I am pretty satisfied. I reckon the card is actually running in PCIe 4.0/16 mode and the issue is with reporting only (quick OpenCL experiments show 17-18GB/s bandwidth over PCIe).

 

Many thanks.

Piotr

 

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Jean_Intel
Moderator
3,764 Views

Hello pioto,

 

Thank you for posting on the Intel️® communities. We understand that you are experiencing issues with your Intel Arc A770.

 

We would investigate this matter, but first, we need to better understand your issue. We want further information about your system. Could you share the complete lspci report?

 

Best regards,

Jean O. 

Intel Customer Support Technician


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Jean_Intel
Moderator
3,699 Views

Hello pioto,


I hope you are doing fine.


Were you able to check the previous post?

Let us know if you still need assistance.


Best regards, 

Jean O.  

Intel Customer Support Technician


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pioto123
Beginner
3,680 Views

Hi Jean,

 

Thank you for getting in touch. I have been trying to reply to your message, but I cannot login to the website with the email I used to post the bug report, and to which your messages are being sent. Very frustrating experience. In the end I created another email and account to reply.

 

Anyway, please find attach lspci report. The report was taken from Ubuntu 22.04 with all recommended Intel drivers. 

I also tried Debian Testing with kernel 6.2-rc8 kernel which now declares Arc 770 stable (no i915.force_probe required). It runs perfectly, but still reports 2.5GT/s x1 PCIe speed.

 

Hopefully that helps.

Regards,

Pioto

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Jean_Intel
Moderator
3,608 Views

Hello pioto123,

 

We understand that you had problems login into your account. Thank you for taking the effort on creating another account to continue with the support.

 

We will do further research on this matter and post the response on this thread once available.

 

Best regards,

Jean O. 

Intel Customer Support Technician


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Jean_Intel
Moderator
3,524 Views

Hello pioto123,

 

We are still investigating this matter, however, we want to confirm the following:

 

  • Are you using any other PCI-E devices on the system?
  • Does the same thing persist if you only use the card?
  • Have you made any changes made in the BIOS that could affect PCIE speed?

 

Best regards,

Jean O. 

Intel Customer Support Technician


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pioto123
Beginner
3,516 Views

Hi Jean,

 

Thanks for coming back. The answers:

* Yes I do. I have two NVMe drives.

* Too much hassle to remove the drives. (Prior I had an AMD RX 6600 XT in the same slot with the same peripherals and there was no problem with lspci reporting)

* The BIOS has stock settings.

 

thanks.

Piotr

 

 

 

 

 

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Jean_Intel
Moderator
3,498 Views

Hello pioto123,


Let us resume our research regarding this matter. We will post back as soon as we have more details.


Best regards,

Jean O. 

Intel Customer Support Technician


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Jean_Intel
Moderator
3,443 Views

Hello pioto123,

 

Thanks for waiting for a response

 

We would like to gather more information about your system environment:

 

  • What is your system hardware configuration?
    • Motherboard:
    • BIOS:
    • CPU:
  • Can you test this on a Windows environment?
  • Also, when using Windows, please create an Intel® Graphics Command Center (IGCC) report to verify more information:
    • Open the Intel Graphics Command Center
    • Navigate to the Support tab
    • Select System Diagnostic
    • Click Generate Report
    • Select Save and name the output file.

 

Best regards,

Jean O.

Intel Customer Support Technician


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pioto123
Beginner
3,433 Views

Hi Jean,

 

Thank you for getting in touch.

Please find attached report from IGGC.

CPU: i9-12900k

MOBO: PRO Z690-A WIFI (msi.com)

BIOS: AMI BIOS version 7D25vAA

I think Windows reports the same link speed as Linux. see screenshot

pioto123_0-1678216956036.png

NVMe drives show correct speed in Windows.

 

Thanks,

Piotr

 

 

 

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Jean_Intel
Moderator
3,423 Views

Hello pioto123,

 

Thanks for the information provided.

 

We will resume our investigation regarding your issue, we will post back as soon as we have more details.

 

Best regards,

Jean O.

Intel Customer Support Technician


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Jean_Intel
Moderator
3,395 Views

Hello wy3,

 

We hope you are doing fine.

 

We have not heard back from you. So we will close this thread. If you need any additional information, submit a new question, as this thread will no longer be monitored.

 

Best regards.

Jean O. 

Intel Customer Support Technician.


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pioto123
Beginner
3,392 Views

Hi Jean,

 

In your previous update you said that you were resuming investigation and have not asked for any additional information, and that you will post back with more details. Please do not close this thread until it is resolved. thank you.

 

best regards

Piotr

 

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Jean_Intel
Moderator
3,385 Views

Hello pioto123,


This was a mistake, and my previous comment was not intended to be posted on this thread. I do apologize for this inconvenience.


We are still investigating your issue.


Once again, I am sorry for my mistake.


Best regards.

Jean O.

Intel Customer Support Technician.


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pioto123
Beginner
3,383 Views

Hi Jean,

 

No worries, it has been a long week, and we all need a break:)

Thank you for the clarification though.

 

many thanks.

Piotr

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Jean_Intel
Moderator
3,253 Views

Hello pioto123,

 

We appreciate your patience. We would like to thank you for the feedback and information about the issue.

 

We would like to let you know that this is a reporting issue, and the card is running at proper PCIe specs.

 

It is not 100% sure this is a firmware issue; however, due to being just a reporting issue and not a functional issue, it won't receive high priority for our debug team to investigate further until the new firmware is officially out.

 

There is a new firmware update in the works, but we are refining the deployment method, so stay tuned for updates on downloadcenter.intel.com.

 

 Also, we would like to know if you are having any other issues with your card.

 

Best regards.

Jean O.

Intel Customer Support Technician.


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pioto123
Beginner
3,237 Views

Hi Jean,

 

I thought as well that it was reporting only bug. Hopefully it will be solved. Anyway the card works, so feel free to close the bug if that makes it easier. Thank you for the update.

B. regards,

Piotr

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Jean_Intel
Moderator
3,205 Views

Hello pioto123,


Thanks for your response.


We are glad to hear that the card is working fine despite the reporting issue. Since you agree, we will close this thread now. If you need any additional information, please submit a new question, as this thread will no longer be monitored.  


Best regards.

Jean O.

Intel Customer Support Technician.


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Jean_Intel
Moderator
2,752 Views

Hello pioto123,


We appreciate your patience.


After reviewing this matter internally, we would like to remark that this does not affect the PCIe port speed, and it does not affect the card’s operation or performance. Unfortunately, there is no PCIe standard-compliant way of resolving this at the moment. Instead, and as a workaround, we recommend using tools (such as GPU-Z) that have other means to retrieve this information and show the correct values. 


Best regards.

Jean O.

Intel Customer Support Technician.


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pioto123
Beginner
2,718 Views

Hi Jean,

 

Thanks for the update. I do not think there is a GPU-Z on Linux. The closest  I could find was CPU-X and it reports the same speed as lspci.

pioto123_0-1681936413835.png

Anyway, as I said earlier the card works well otherwise, so not a big deal.

Thanks.

Piotr

 

 

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Jean_Intel
Moderator
2,687 Views

Hello pioto123,

 

Thanks for the information provided.

 

We understand that, as per your understanding, there is a GPU-Z option for Linux-based Operating Systems. We recommend you contact the GPU-Z developer team to confirm if they have a chance to use their tool on a Linux environment or if there is any alternative solution that has the same means to retrieve this information and show the correct values.

 

Also, we are glad to hear that the video card is working as expected. As we mentioned previously, this issue does not affect the PCIe port speed, and it should not affect performance. We are planning to keep this thread open to see if you have any other questions about this matter, don't hesitate to let us know any questions you may have.

 

Best regards.

Jean O.

Intel Customer Support Technician.


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