On 05/21/2013 03:20 PM, Joe Julian wrote:
I have about 100 of these creditcard/check scanners that are dropping
events. I was able to find some overflows that I assume are probably
related to the problem, "usb 4-1: ctrl urb status -75 received".
Short of asking the vendor to fix their product or compiling a custom
kernel, are there any other options? Can the MaxPacketSize or the
buffer size be overridden somehow (/sys/bus/usb/devices... maybe)?
I have started a dialog with UIC (Uniform Industrial Corp) about a fix,
but I'm not very hopeful. Is there anything I can do to work around the
overflow?
Bus 004 Device 002: ID 6352:830a
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x6352
idProduct 0x830a
bcdDevice 1.00
iManufacturer 1 F/W ID: CKR02611
iProduct 2 ST8300 Series Check Reader
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 34
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 3 HID Device
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 1 Boot Interface Subclass
bInterfaceProtocol 1 Keyboard
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 63
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Device Status: 0x0000
(Bus Powered)
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