DId you read the FAQ about this issue? On Mon, 3 Dec 2007, David Griffith wrote:
> > I'm running 2.6.22, specifically Ubuntu Gutsy. When I plug in a usb 2.0 > masss storage device, I get this in dmesg: > > [ 131.646942] usb 2-3: new high speed USB device using ehci_hcd and address 5 > [ 131.758810] usb 2-3: device descriptor read/64, error -71 > [ 131.974536] usb 2-3: device descriptor read/64, error -71 > [ 132.190286] usb 2-3: new high speed USB device using ehci_hcd and address 6 > [ 132.302148] usb 2-3: device descriptor read/64, error -71 > [ 132.517889] usb 2-3: device descriptor read/64, error -71 > [ 132.733653] usb 2-3: new high speed USB device using ehci_hcd and address 7 > [ 133.141157] usb 2-3: device not accepting address 7, error -71 > [ 133.253029] usb 2-3: new high speed USB device using ehci_hcd and address 8 > [ 133.660542] usb 2-3: device not accepting address 8, error -71 > > The drive does not appear to be recognized, nor does /dev/bus/usb/devices > say anything about it. If I do "modprobe -r ehci_hcd", the drive is > recognized as a USB 1.1 device. Not surprisingly, the throughput is a > horrid 1 megabyte per second or worse. This problem seems to crop up a lot > and then the bug report is closed when the problem mysteriously vanishes. > For example > https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.15/+bug/52551 > > Here's the relevant output from lsusb: > > Bus 003 Device 003: ID 067b:2506 Prolific Technology, Inc. > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 0 (Defined at Interface level) > bDeviceSubClass 0 > bDeviceProtocol 0 > bMaxPacketSize0 64 > idVendor 0x067b Prolific Technology, Inc. > idProduct 0x2506 > bcdDevice 1.00 > iManufacturer 1 > iProduct 2 > iSerial 3 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 32 > bNumInterfaces 1 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0xc0 > Self Powered > MaxPower 100mA > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 2 > bInterfaceClass 8 Mass Storage > bInterfaceSubClass 6 SCSI > bInterfaceProtocol 80 Bulk (Zip) > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x01 EP 1 OUT > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0040 1x 64 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 0x0040 1x 64 bytes > bInterval 0 > > > -- /------------------------------------+-------------------------\ |Stephen J. Gowdy, SLAC | CERN Office: 32-2-A22| |http://www.slac.stanford.edu/~gowdy/ | CH-1211 Geneva 23 | | | Switzerland | |EMail: [EMAIL PROTECTED] | Tel: +41 22 767 5840 | \------------------------------------+-------------------------/ ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
