I have a NUC7iBNH and I want to connect more than 64 USB devices. I tried to disable the xHCI from the BIOS but I didn't see any feature there, also I used "lspci -H1 -d xxxx:xxxx d0.l=0" command on the Ubuntu to disable the feature but it is not working also. Is it any way to upgrade the number of USB devices to 127? or is it any way to add a USB BUS to that?
Hello, hmasoumi. Thank you very much for sharing your issue with the Intel Communities Team. I will be more than glad to assist you.
You can add more USB devices to the NUC if you use a USB HUB. Please take into consideration that you can add as many devices as the power limit of the USB port allows you to. You can double check the power of the port in the https://www.intel.com/content/dam/support/us/en/documents/boardsandkits/NUC7i5BN_NUC7i7BN_TechProdSp... Technical Product Specifications of the NUC, page 28.
I'm using 5 x Cambrionix pp15 USB HUB( in 2 layers) and they have the sufficient power for all devices , but I got the message that number of devices are more than 64. I tried this on the other desktop computers, and I got the xHCI limitation error. By disabling the xHCI feature it works. But in NUC computer it was totally different. The error was about the number of devices that connected. (More than 64).
Hello, hmasoumi. Thank you for your response.
Allow me to investigate further into this issue. Once I have an update I will be back to you.
Hello, hmasoumi. Thank you very much for your patience.
Allow me to inform you that the NUC is capable of handle 128 endpoints, which means, 64 devices. In order to have this better explained, please refer to the fifth post by rguevara in the following thread: /thread/120473 https://communities.intel.com/thread/120473
Thank you for your information, The main problem is the limitation of number of endpoint, each devices that I am using, have 4-8 endpoints and I get the error for number of endpoints also. If I can disable the xHCI on the system, USB port work as USB2.0 that is fine. How can I disable the xHCI feature.
Thank you for your response.
Looking into your case I would make reference to other this thread /thread/124596 https://communities.intel.com/thread/124596 where you can see that the option to disable the xHCI on not available on the BIOS.