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Intel DSA and Intel Arc Control both think Resizable BAR is not supported, but it is enabled.

jpesteban
Novice
1,230 Views

Hi,

I've noticed that the Intel Driver Support Assistant and Intel Arc Control are reporting that Resizable BAR is not only not enabled in my system, but completely unsupported. See screenshots for the reports.

However, in my UEFI, I definitely have all the Resizable BAR requirements enabled (Above 4G Decoding, CSM disabled, ReBAR enabled) and GPU-Z reports ReBAR as enabled in Windows.

Is this just a reporting error, or is my Arc A770 going to really function as if ReBAR is not working on my system?

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Jean_Intel
Employee
1,201 Views

Hello jpesteban,

 

Thank you for posting on the Intel️® communities. We would be more than glad to help you with your issue.

 

We are investigating this issue. It appears to be a reporting issue since Resizable BAR is enabled; your system performance should not be affected. Since you are using an AMD platform, you can try as a temporary workaround the following:

 

  • Update BIOS (contact computer/motherboard manufacturer for assistance).
  • Boot into BIOS.
  • Disable the Above 4G Decodin' and Resizable BAR support options.
  • Disable Secure Virtual Machine (SVM) option.
  • Save and Exit.
  • Restart the computer.
  • Boot into BIOS.
  • Re-enable Above 4G Decoding and Resizable BAR support.
  • Save and Exit.
  • Restart the computer.
  • Boot into Windows and verify if Arc Control reports Resizable BAR as supported.

 

Best regards,

Jean O. 

Intel Customer Support Technician


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Jean_Intel
Employee
1,158 Views

Hello jpesteban,


We 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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jpesteban
Novice
1,121 Views

Hello, thank you for the advice and follow-up.

Unfortunately I have not been able to try these steps yet because, the day after I posted the opening post, my PC crashed and would not power on again. I've taken it to a repair shop since then and they suspect a defective motherboard, though I have also asked them to thoroughly test my Intel Arc A770LE to see if it still functions properly.

I'll be unable to provide a resolution to this support case if the motherboard in question is indeed non-functional. Feel free to consider it closed for now.

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Jean_Intel
Employee
1,093 Views

Hello jpesteban,


Thanks for the information provided.


Since you have taken the system to a repair shop. As per your request, we will now close this thread. If you have any further inquiries, please submit a new question since this thread will no longer be monitored for updates


Best regards, 

Jean O.  

Intel Customer Support Technician


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