I'm getting a black screen from my Ezonics ez.com usb webcam:
$ xawtv
This is xawtv-3.94, running on Linux/i686 (2.6.10-ac8)
xinerama 0: 1600x1200+0+0
xinerama 1: 1280x854+0+1200
/dev/video0 [v4l]: no overlay support
v4l-conf had some trouble, trying to continue anyway
ioctl: VIDIOCGFBUF(base=(nil);height=0;width=0;depth=0;bytesperline=0): Invalid argument
ioctl: VIDIOCSPICT(brightness=32768;hue=32768;colour=32767;contrast=32768;whiteness=0;depth=24;palette=RGB24): Invalid argument
ioctl: VIDIOCSPICT(brightness=32767;hue=32768;colour=32768;contrast=32768;whiteness=0;depth=24;palette=RGB24): Invalid argument
ioctl: VIDIOCSPICT(brightness=32768;hue=32767;colour=32768;contrast=32768;whiteness=0;depth=24;palette=RGB24): Invalid argument
ioctl: VIDIOCSPICT(brightness=32768;hue=32768;colour=32768;contrast=32767;whiteness=0;depth=24;palette=RGB24): Invalid argument
The directory /proc/cpia exists but is empty, which means cpia-control isn't working.
Is this a sysfs issue? dmesg says "Please fix your driver for proper sysfs support, see http://lwn.net/Articles/36850/";
Cheers, Dave
Details:
I'm running Debian sid with kernel 2.6.10-ac8 and
libsysfs1 1.2.0-4 sysfsutils 1.2.0-4
$ v4l-conf v4l-conf: using X11 display :0 dga: version 2.0 mode: 1600x2054, depth=24, bpp=32, bpl=7168, base=0xec000000 /dev/video0 [v4l2]: ioctl VIDIOC_QUERYCAP: Invalid argument /dev/video0 [v4l]: no overlay support
# dmesg:
cpia: Ignoring new-style parameters in presence of obsolete ones
V4L-Driver for Vision CPiA based cameras v1.2.3
Since in-kernel colorspace conversion is not allowed, it is disabled by default now. Users should fix the applic
ations in case they don't work without conversion reenabled by setting the 'colorspace_conv' module parameter to
1<6>USB driver for Vision CPiA based cameras v1.2.3
USB CPiA camera found
videodev: "CPiA Camera" has no release callback.
Please fix your driver for proper sysfs support, see http://lwn.net/Articles/36850/
usbcore: registered new driver cpia
# lspci:
0000:00:0b.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 50)
0000:00:0b.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 50)
0000:00:0b.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 51)
# lsusb
Bus 002 Device 004: ID 0553:0002 STMicroelectronics Imaging Division (VLSI Vision) CPiA WebCam
Bus 002 Device 003: ID 06bd:0001 AGFA-Gevaert NV SnapScan 1212U
Bus 002 Device 002: ID 0451:1446 Texas Instruments, Inc. TUSB2040/2070 Hub
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 002: ID 046d:c00c Logitech, Inc. Optical Wheel Mouse
Bus 001 Device 001: ID 0000:0000
# lsusb -vvv
Bus 002 Device 004: ID 0553:0002 STMicroelectronics Imaging Division (VLSI Vision) CPiA WebCam
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0553 STMicroelectronics Imaging Division (VLSI Vision)
idProduct 0x0002 CPiA WebCam
bcdDevice 1.00
iManufacturer 0
iProduct 1
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 73
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
MaxPower 250mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0000 bytes 0 once
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x01c0 bytes 448 once
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x02c0 bytes 704 once
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 3
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x03c0 bytes 960 once
bInterval 1
# usbview
USB Camera Speed: 12Mb/s (full) USB Version: 1.00 Device Class: 00(>ifc ) Device Subclass: 00 Device Protocol: 00 Maximum Default Endpoint Size: 8 Number of Configurations: 1 Vendor Id: 0553 Product Id: 0002 Revision Number: 1.00
Config Number: 1 Number of Interfaces: 1 Attributes: 80 MaxPower Needed: 250mA
Interface Number: 0
Name: cpia
Alternate Number: 0
Class: ff(vend.)
Sub Class: 0
Protocol: 0
Number of Endpoints: 1 Endpoint Address: 81
Direction: in
Attribute: 1
Type: Isoc
Max Packet Size: 0
Interval: 1ms Interface Number: 0
Name: cpia
Alternate Number: 1
Class: ff(vend.)
Sub Class: 0
Protocol: 0
Number of Endpoints: 1 Endpoint Address: 81
Direction: in
Attribute: 1
Type: Isoc
Max Packet Size: 448
Interval: 1ms Interface Number: 0
Name: cpia
Alternate Number: 2
Class: ff(vend.)
Sub Class: 0
Protocol: 0
Number of Endpoints: 1 Endpoint Address: 81
Direction: in
Attribute: 1
Type: Isoc
Max Packet Size: 704
Interval: 1ms Interface Number: 0
Name: cpia
Alternate Number: 3
Class: ff(vend.)
Sub Class: 0
Protocol: 0
Number of Endpoints: 1 Endpoint Address: 81
Direction: in
Attribute: 1
Type: Isoc
Max Packet Size: 960
Interval: 1ms# v4l-info
### video4linux device info [/dev/video0] ###
general info
VIDIOCGCAP
name : "CPiA Camera"
type : 0x201 [CAPTURE,SUBCAPTURE]
channels : 1
audios : 0
maxwidth : 352
maxheight : 288
minwidth : 48
minheight : 48channels
VIDIOCGCHAN(0)
channel : 0
name : "Camera"
tuners : 0
flags : 0x0 []
type : CAMERA
norm : 0tuner ioctl VIDIOCGTUNER: Invalid argument
audio ioctl VIDIOCGAUDIO: Invalid argument
picture
VIDIOCGPICT
brightness : 32768
hue : 32768
colour : 32768
contrast : 32768
whiteness : 0
depth : 24
palette : RGB24buffer ioctl VIDIOCGFBUF: Invalid argument
window
VIDIOCGWIN
x : 0
y : 0
width : 352
height : 288
chromakey : 0
flags : 0
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