On Sun, Aug 15, 2021 at 09:32:06AM +1000, Eyal Lebedinsky wrote: > I have an external 4-way USB3.0 hub (I actually have two of them) That do not behave as expected. > It is an XCD XCDESSUSBH4BK. It is unpowered. I am on fedora 34, kernel 5.13.8-200.fc34.x86_64 > > For starters, I found that attaching a USB SSD does not allow booting from it. That is up to your BIOS, not Linux. > I then found that when attaching my phone it is not recognized. In what way? > I searched the hub model and IDs but did not find relevant information. > Is there an official list of supported hubs (or devices)? No, as any list would instantly be out of date. > Here is what it looks like. > > When the hub is attached (no phone) I see > Bus 001 Device 048: ID 0bda:5411 Realtek Semiconductor Corp. RTS5411 Hub > and > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M > |__ Port 5: Dev 5, If 0, Class=Hub, Driver=hub/4p, 480M > |__ Port 2: Dev 48, If 0, Class=Hub, Driver=hub/4p, 480M > Attaching the phone does not add a device. > > Detaching/attaching the hub (with the phone already plugged in) I get > Bus 001 Device 052: ID 04e8:6860 Samsung Electronics Co., Ltd Galaxy A5 (MTP) > Bus 001 Device 051: ID 0bda:5411 Realtek Semiconductor Corp. RTS5411 Hub > and > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M > |__ Port 5: Dev 5, If 0, Class=Hub, Driver=hub/4p, 480M > |__ Port 2: Dev 51, If 0, Class=Hub, Driver=hub/4p, 480M > |__ Port 1: Dev 52, If 1, Class=Communications, Driver=cdc_acm, 480M > |__ Port 1: Dev 52, If 2, Class=CDC Data, Driver=cdc_acm, 480M > |__ Port 1: Dev 52, If 0, Class=Imaging, Driver=, 480M > |__ Port 1: Dev 52, If 3, Class=Vendor Specific Class, Driver=, 480M > and the phone is recognized and accessible as MTP device. Great, so when does this not work? This shows a successful device found. thanks, greg k-h
