Hi Martin, On Saturday 31 March 2012 17:07:22 Martin Mokrejs wrote: > Hi, > when inspecting "lsusb -v" output I came across this UNRECOGNIZED message. > Anything to worry about? > > Bus 001 Device 003: ID 05ca:1820 Ricoh Co., Ltd > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 239 Miscellaneous Device > bDeviceSubClass 2 ? > bDeviceProtocol 1 Interface Association > bMaxPacketSize0 64 > idVendor 0x05ca Ricoh Co., Ltd > idProduct 0x1820 > bcdDevice c.27 > iManufacturer 1 CN01MWM9724871A4KB28A00 > iProduct 2 Laptop_Integrated_Webcam_FHD > [cut] > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 13 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 5 > Transfer Type Isochronous > Synch Type Asynchronous > Usage Type Data > wMaxPacketSize 0x1400 3x 1024 bytes > bInterval 1 > ** UNRECOGNIZED: 24 ff 42 49 53 54 00 01 05 02 10 00 00 00 00 00 01 > 06 b8 0b 02 07 b8 0b 03 08 b8 0b 04 09 4e 20 05 0a b8 0b That's a vendor-specific descriptor, as reported by the second byte being 0xff. Vendor-specific descriptors are not standard (and very often not documented), so lsusb doesn't know how to decode it. The uvcvideo driver happily ignores it completely. Such descriptors are used for various purposes, often to add proprietary extensions to the device. In this case, as the next 4 bytes decode to 'BIST' (most likely Built-In Self Test) in ASCII, I expect the descriptor to be used for production and QA purpose. > It is about the uvcvideo driver I think. The camera works, at least in skype > so probably I should not bother you asking this question at all. ;-) Getting a better understanding of Linux is always worth a question :-) > usb 1-1.5: new high-speed USB device number 3 using ehci_hcd > usb 1-1.5: skipped 1 descriptor after configuration > usb 1-1.5: skipped 6 descriptors after interface > usb 1-1.5: skipped 1 descriptor after endpoint > usb 1-1.5: skipped 19 descriptors after interface > usb 1-1.5: skipped 1 descriptor after endpoint > usb 1-1.5: default language 0x0409 > usb 1-1.5: udev 3, busnum 1, minor = 2 > usb 1-1.5: New USB device found, idVendor=05ca, idProduct=1820 > usb 1-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=0 > usb 1-1.5: Product: Laptop_Integrated_Webcam_FHD > usb 1-1.5: Manufacturer: CN01MWM9724871A4KB28A00 > usb 1-1.5: usb_probe_device > usb 1-1.5: configuration #1 chosen from 1 choice > usb 1-1.5: adding 1-1.5:1.0 (config #1, interface 0) > uvcvideo 1-1.5:1.0: usb_probe_interface > uvcvideo 1-1.5:1.0: usb_probe_interface - got id > uvcvideo: Found UVC 1.00 device Laptop_Integrated_Webcam_FHD (05ca:1820) > input: Laptop_Integrated_Webcam_FHD as > /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.0/input/input8 usb > 1-1.5: adding 1-1.5:1.1 (config #1, interface 1) -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
