VoxForge
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NOTE: While anyone can plug in a USB device, you often need to be the root user to view the system log files.
[...]
Tail the system log file:
tail -f /var/log/messages
and them plug in a Philips USB camera, Logitech QuickCam 3000 Pro, or PWC supported USB camera.
You should see something like the following messages in /var/log/messages:
kernel: hub.c: USB new device connect on bus1/2, assigned device number 3
kernel: pwc Logitech QuickCam 3000 Pro USB webcam detected.
kernel: pwc Registered as /dev/video0.
kernel: usbaudio: device 3 audiocontrol interface 1 has 1 input and 0 output AudioStreaming interfaces
kernel: usbaudio: device 3 interface 2 altsetting 0 FORMAT_TYPE descriptor not found
kernel: usbaudio: valid input sample rate 44100
kernel: usbaudio: device 3 interface 2 altsetting 1: format 0x00000010 sratelo 44100 sratehi 44100 attributes 0x00
kernel: usbaudio: valid input sample rate 22050
kernel: usbaudio: device 3 interface 2 altsetting 2: format 0x00000010 sratelo 22050 sratehi 22050 attributes 0x00
kernel: usbaudio: valid input sample rate 11025
kernel: usbaudio: device 3 interface 2 altsetting 3: format 0x00000010 sratelo 11025 sratehi 11025 attributes 0x00
kernel: usbaudio: valid input sample rate 8000
kernel: usbaudio: device 3 interface 2 altsetting 4: format 0x00000010 sratelo 8000 sratehi 8000 attributes 0x00
kernel: usbaudio: registered dsp 14,19
kernel: usbaudio: registered mixer 14,16
/etc/hotplug/usb.agent: Setup pwc audio for USB product 46d/8b0/2
/etc/hotplug/usb.agent: Module setup pwc for USB product 46d/8b0/2
hotplug/usb/pwc[7273]: Phillips webcam setup
hotplug/usb/pwc[7277]: Phillips webcam complete
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dmesg is used to examine or control the kernel ring buffer.The program helps users to print out their bootup messages. Instead of copying the messages by hand, the user need only:
dmesg > boot.messages
and mail the boot.messages file to whoever can debug their problem.
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