Description
update Di 6. Nov 14:56:42 CET 2012
This makes an USB keyboard almost unusable. E.g. a missing a key-up event causes an endless rrrrrrrrrepeating of the key.
Tested with several keyboards and rPIs (vB2.0/Sony), Vcc (TP1/2) is exact 5.0V.
vcgencmd version
Oct 31 2012 17:57:31
Copyright (c) 2012 Broadcom
version 347415 (release)
uname -a
Linux raspberrypi 3.2.27+ #257 PREEMPT Mon Nov 5 00:01:55 GMT 2012 armv6l GNU/Linux
dmesg shows for a keyboard (~ 10x/min):
[11022.474455] usb 1-1.3.4: reset low-speed USB device number 11 using dwc_otg
[11029.513811] usb 1-1.3.4: reset low-speed USB device number 11 using dwc_otg
[11064.970674] usb 1-1.3.4: reset low-speed USB device number 11 using dwc_otg
...
After disconnecting the mouse dongle,
Nov 6 14:22:50 raspberrypi kernel: [14931.073728] usb 1-1.3.1: USB disconnect, device number 12
Nov 6 14:22:50 raspberrypi kernel: [14931.263161] usb 1-1.3.4: reset low-speed USB device number 11 using dwc_otg
the keybord starts working again as expected (without other kernel message).
The same hardware works flawlessly on an Ubuntu/Fedora Linux machine.
lsusb -vs 009
Bus 001 Device 009: ID 046d:c526 Logitech, Inc. Nano Receiver
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 32
idVendor 0x046d Logitech, Inc.
idProduct 0xc526 Nano Receiver
bcdDevice 5.00
iManufacturer 1 Logitech
iProduct 2 USB Receiver
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 59
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 4 RQR05.00_B0023
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 98mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 1 Boot Interface Subclass
bInterfaceProtocol 2 Mouse
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 67
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 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 79
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0014 1x 20 bytes
bInterval 1
Device Status: 0x0000
(Bus Powered)