On 15.08.21 01:32, Eyal Lebedinsky wrote: > I searched the hub model and IDs but did not find relevant information. > Is there an official list of supported hubs (or devices)? No, any hub by implementing the hub specification is supported. > Attaching the phone does not add a device. Just for the sake of completeness, could you post 'lsusb -v' for that hub? > ## plug phone: > (no new messages) That suggests a bug in the hub firmware. specifically that under unknown circumstances it fails to generate events for connection changes. > Aug 15 09:07:07 e7 kernel: usb 1-5.2.1: new high-speed USB device > number 57 using xhci_hcd > Aug 15 09:07:07 e7 kernel: usb 1-5.2.1: New USB device found, > idVendor=04e8, idProduct=6860, bcdDevice= 4.00 > Aug 15 09:07:07 e7 kernel: usb 1-5.2.1: New USB device strings: Mfr=2, > Product=3, SerialNumber=4 > Aug 15 09:07:07 e7 kernel: usb 1-5.2.1: Product: SAMSUNG_Android In other respects it does work. Based on a hunch, could you test whether the circumstances this device fails under is related to runtime PM? In order to do so you boot with usbcore.autosuspend=-1 on the kernel command line. Regards Oliver
