https://bugzilla.kernel.org/show_bug.cgi?id=213839 Jonathan McDowell (noodles@xxxxxxxx) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |noodles@xxxxxxxx --- Comment #5 from Jonathan McDowell (noodles@xxxxxxxx) --- I've just ended up with one of these devices and see the same behaviour; on Linux (5.10.70 from Debian) only 3 ports are operational, whereas when plugged into a Windows laptop all 7 ports work. It seems this is a knock-off hub - it was sold as 480Mb/s capable, but is only reporting itself as full-speed (12Mb/s). As Tomas reports it shows up as 2 USB hubs - lsusb -vv output as follows: Bus 003 Device 080: ID 0a05:7211 Unknown Manufacturer hub Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 9 Hub bDeviceSubClass 0 bDeviceProtocol 0 Full speed (or root) hub bMaxPacketSize0 8 idVendor 0x0a05 Unknown Manufacturer idProduct 0x7211 hub bcdDevice 1.00 iManufacturer 0 iProduct 1 USB2.0 HUB iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 0x0019 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xe0 Self Powered Remote Wakeup MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 9 Hub bInterfaceSubClass 0 bInterfaceProtocol 0 Full speed (or root) hub iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0001 1x 1 bytes bInterval 255 Apparently the chip involved is a Micov MW7211 which is a single chip full-speed hub solution. I've no particular interest in seeing this work, given that it's not high-speed capable, but figured the additional information might be helpful as there's obviously some difference in the way Windows is driving the hub compared to Linux. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
