Hi,
I'm having some problems reading from /dev/video0 when using my Logitech
QuickCam Orbit MP camera. I'm using an ubuntu 2.6.15-28-386 kernel.
At module insertion time, with trace set to 15, I see the following in
dmesg:
[17179739.156000] Linux video capture interface: v1.00
[17179739.172000] uvcvideo: Adding mapping Brightness to control
00000000-0000-0000-0000-000000000101/2.
[17179739.172000] uvcvideo: Adding mapping Contrast to control
00000000-0000-0000-0000-000000000101/3.
[17179739.172000] uvcvideo: Adding mapping Hue to control
00000000-0000-0000-0000-000000000101/6.
[17179739.172000] uvcvideo: Adding mapping Saturation to control
00000000-0000-0000-0000-000000000101/7.
[17179739.172000] uvcvideo: Adding mapping Sharpness to control
00000000-0000-0000-0000-000000000101/8.
[17179739.172000] uvcvideo: Adding mapping Gamma to control
00000000-0000-0000-0000-000000000101/9.
[17179739.172000] uvcvideo: Adding mapping Backlight Compensation to
control 00000000-0000-0000-0000-000000000101/1.
[17179739.172000] uvcvideo: Adding mapping Gain to control
00000000-0000-0000-0000-000000000101/4.
[17179739.172000] uvcvideo: Adding mapping Power Line Frequency to control
00000000-0000-0000-0000-000000000101/5.
[17179739.172000] uvcvideo: Adding mapping Hue, Auto to control
00000000-0000-0000-0000-000000000101/16.
[17179739.172000] uvcvideo: Adding mapping Pan (relative) to control
63610682-5070-49ab-b8cc-b3855e8d2256/1.
[17179739.172000] uvcvideo: Adding mapping Tilt (relative) to control
63610682-5070-49ab-b8cc-b3855e8d2256/1.
[17179739.172000] uvcvideo: Adding mapping Pan/Tilt (reset) to control
63610682-5070-49ab-b8cc-b3855e8d2256/2.
[17179739.172000] uvcvideo: Adding mapping Exposure, Auto to control
00000000-0000-0000-0000-000000000001/2.
[17179739.172000] uvcvideo: Adding mapping Exposure (Absolute) to control
00000000-0000-0000-0000-000000000001/4.
[17179739.172000] uvcvideo: Adding mapping White Balance Temperature, Auto
to control 00000000-0000-0000-0000-000000000101/11.
[17179739.172000] uvcvideo: Adding mapping White Balance Temperature to
control 00000000-0000-0000-0000-000000000101/10.
[17179739.172000] usbcore: registered new driver uvcvideo
[17179739.172000] USB Video Class driver (v0.1.0)
And when I plug in the USB cable, I see:
[17179760.888000] usb 5-7: new high speed USB device using ehci_hcd and
address 4
[17179761.196000] uvcvideo: Probing known UVC device 7 (046d:08c2)
[17179761.200000] uvcvideo: Found format MJPEG.
[17179761.200000] uvcvideo: - 160x120 (30.0 fps)
[17179761.200000] uvcvideo: - 176x144 (30.0 fps)
[17179761.200000] uvcvideo: - 320x240 (15.0 fps)
[17179761.200000] uvcvideo: - 352x288 (30.0 fps)
[17179761.200000] uvcvideo: - 432x240 (30.0 fps)
[17179761.200000] uvcvideo: - 480x360 (30.0 fps)
[17179761.200000] uvcvideo: - 512x288 (30.0 fps)
[17179761.200000] uvcvideo: - 640x360 (30.0 fps)
[17179761.200000] uvcvideo: - 640x480 (15.0 fps)
[17179761.200000] uvcvideo: - 704x576 (15.0 fps)
[17179761.200000] uvcvideo: - 864x480 (15.0 fps)
[17179761.200000] uvcvideo: - 960x720 (15.0 fps)
[17179761.200000] uvcvideo: Found format Uncompressed.
[17179761.200000] uvcvideo: - 1024x576 (10.0 fps)
[17179761.200000] uvcvideo: - 1280x960 (7.5 fps)
[17179761.200000] uvcvideo: Found a Status endpoint (addr 87).
[17179761.200000] uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c2)
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/2 to device 7 entity 2
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/3 to device 7 entity 2
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/7 to device 7 entity 2
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/8 to device 7 entity 2
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/9 to device 7 entity 2
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/1 to device 7 entity 2
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/4 to device 7 entity 2
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/5 to device 7 entity 2
[17179761.200000] uvcvideo: Added control
63610682-5070-49ab-b8cc-b3855e8d2256/1 to device 7 entity 9
[17179761.200000] uvcvideo: Added control
63610682-5070-49ab-b8cc-b3855e8d2256/2 to device 7 entity 9
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000001/2 to device 7 entity 1
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000001/4 to device 7 entity 1
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/11 to device 7 entity 2
[17179761.200000] uvcvideo: Added control
00000000-0000-0000-0000-000000000101/10 to device 7 entity 2
[17179761.200000] uvcvideo: Scanning UVC chain: OT 5 (-> 8 10 9) <- Unit 4
<- Unit 3 <- Unit 2 <- IT 1
[17179761.200000] uvcvideo: Found a valid video chain (1 -> 5).
[17179761.212000] uvcvideo: UVC device initialized.
[17179762.384000] 4:3:1: cannot set freq 0 to ep 0x86
[17179763.384000] 4:3:2: cannot set freq 0 to ep 0x86
[17179764.388000] 4:3:3: cannot get freq at ep 0x86
[17179764.468000] usbcore: registered new driver snd-usb-audio
As far as I can tell the above looks correct, and once plugged in the
/dev/video0 device is created by udev. However, when I go to read from
the /dev/video0 device, it fails:
[EMAIL PROTECTED] ~]$ ls -l /dev/video0
crw-rw---- 1 root video 81, 0 Mar 23 13:23 /dev/video0
[EMAIL PROTECTED] ~]$ cat /dev/video0 > /tmp/foo.mpg
cat: /dev/video0: No such device
No additional lines appear in dmesg after attempting to read from
/dev/video0.
Does anyone know what the problem might be? I have two cameras of
the same make and model, but ran into the same problem with both.
Thanks,
-mct
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