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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Hello pioto123,
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.
@pioto wrote: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).
I found the same issue with it reporting x1, and did a similar experiment with the 'Memory Bandwidth' benchmark in xpu-smi:
xpu-smi diag -d 0 --singletest 5
In my case, it said it failed (pretty sure it's fine though) but still reported 11.108 GBPS which makes sense for PCIe 3.0 x16 + overhead (which is correct).
Just wanted to add the benchmark for other people's piece of mind.
Thanks,
Steve
