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 -- David Griffith [EMAIL PROTECTED] A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? ------------------------------------------------------------------------- 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
