Hi, I just recently moved an internal USB card reader from an ehci machine to an xhci machine, and dmesg is filled with this message over and over again: [ 1596.047684] usb 1-8: reset high-speed USB device number 4 using xhci_hcd [ 1596.090902] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88041b06d700 [ 1596.090904] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88041b06d740 This did not happen on the ehci machine. Oddly, the card reader still works, but it just keeps printing that message in the log. -Joe Yasi dmesg: [ 2.121631] usb 1-8: new high-speed USB device number 4 using xhci_hcd [ 2.479333] Switched to clocksource tsc [ 2.719236] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off [ 3.034283] usb 1-8: New USB device found, idVendor=054c, idProduct=01bd [ 3.034305] usb 1-8: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 3.034326] usb 1-8: Product: USB 2.0 MultiCard R/W [ 3.034341] usb 1-8: Manufacturer: Sony [ 3.034355] usb 1-8: SerialNumber: 2B1060000FAD [ 3.036450] usb-storage 1-8:1.0: USB Mass Storage device detected [ 3.036499] scsi8 : usb-storage 1-8:1.0 [ 3.036548] usbcore: registered new interface driver usb-storage -- snip -- [ 9.022011] usb 1-8: reset high-speed USB device number 4 using xhci_hcd [ 9.065195] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88041b7e4480 [ 9.065197] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88041b7e44c0 -- [ 11.392706] usb 1-8: reset high-speed USB device number 4 using xhci_hcd [ 11.435895] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88041b7e4480 [ 11.435899] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88041b7e44c0 -- [ 16.250041] usb 1-8: reset high-speed USB device number 4 using xhci_hcd [ 16.293239] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88041b7e4480 [ 16.293241] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88041b7e44c0 -- lsusb -vv -s 1:4 Bus 001 Device 004: ID 054c:01bd Sony Corp. MRW62E Multi-Card Reader/Writer Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x054c Sony Corp. idProduct 0x01bd MRW62E Multi-Card Reader/Writer bcdDevice 51.95 iManufacturer 1 Sony iProduct 2 USB 2.0 MultiCard R/W iSerial 3 2B1060000FAD bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 32 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 4 CARD READER bmAttributes 0x80 (Bus Powered) MaxPower 500mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 8 Mass Storage bInterfaceSubClass 6 SCSI bInterfaceProtocol 80 Bulk-Only iInterface 5 Bulk-In, Bulk-Out, Interface Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Device Qualifier (for other device speed): bLength 10 bDescriptorType 6 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 bNumConfigurations 1 Device Status: 0x0000 (Bus Powered) -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html