Pour mieux d'explication voila ce qu'il se passe qd je branche la webcam :
hub.c: new USB device 00:04.3-1, assigned address 9
drivers/usb/spca50x.c: USB SPCA50x camera found. Aiptek PocketDVII 1.3Mp
drivers/usb/spca50x.c: Ignoring Interface 1 of Aiptek PocketDVII
usbaudio: device 9 audiocontrol interface 2 has 1 input and 0 output AudioStreaming i
nterfaces
usbaudio: device 9 interface 3 altsetting 1 channels 1 framesize 2 configured
usbaudio: valid input sample rate 0
usbaudio: device 9 interface 3 altsetting 1: format 0x00000010 sratelo 0 sratehi 0 at
tributes 0x00
usbaudio: device 9 interface 3 altsetting 2 channels 1 framesize 2 configured
usbaudio: valid input sample rate 0
usbaudio: device 9 interface 3 altsetting 2: format 0x00000010 sratelo 0 sratehi 0 at
tributes 0x00
usbaudio: device 9 interface 3 altsetting 3 channels 1 framesize 2 configured
usbaudio: valid input sample rate 0
usbaudio: device 9 interface 3 altsetting 3: format 0x00000010 sratelo 0 sratehi 0 at
tributes 0x00
usbaudio: device 9 interface 3 altsetting 4 channels 1 framesize 2 configured
usbaudio: valid input sample rate 0
usbaudio: device 9 interface 3 altsetting 4: format 0x00000010 sratelo 0 sratehi 0 at
tributes 0x00
usbaudio: device 9 interface 3 altsetting 5 channels 1 framesize 2 configured
usbaudio: valid input sample rate 0
usbaudio: device 9 interface 3 altsetting 5: format 0x00000010 sratelo 0 sratehi 0 at
tributes 0x00
usbaudio: device 9 interface 3 altsetting 6 channels 1 framesize 2 configured
usbaudio: valid input sample rate 0
usbaudio: device 9 interface 3 altsetting 6: format 0x00000010 sratelo 0 sratehi 0 at
tributes 0x00
usbaudio: device 9 interface 3 altsetting 7 channels 1 framesize 2 configured
usbaudio: valid input sample rate 48000
usbaudio: device 9 interface 3 altsetting 7: format 0x00000010 sratelo 48000 sratehi
48000 attributes 0x00
usbaudio: registered dsp 14,35
usbaudio: constructing mixer for Terminal 4 type 0x0101
usbaudio: no mixer controls found for Terminal 4
usb_audio_parsecontrol: usb_audio_state at c601c640
et ds /var/log/syslog il me rajoute ça :
/etc/hotplug/usb.agent: Setup spca50x audio for USB product 8ca/104/100
/etc/hotplug/usb.agent: missing kernel or user mode driver spca50x
/etc/hotplug/usb.agent: missing kernel or user mode driver audio
/etc/hotplug/usb.agent: Setup spca50x audio for USB product 8ca/104/100
/etc/hotplug/usb.agent: missing kernel or user mode driver spca50x
/etc/hotplug/usb.agent: missing kernel or user mode driver audio
kernel: usb-uhci.c: ENXIO 80000980, flags 0, urb cfae4f40, burb cfae45c0
kernel: usbdevfs: USBDEVFS_CONTROL failed dev 9 rqt 128 rq 6 len 18 ret -6
voila la meme chose deux fois ds le log 
FORUM HardWare.fr
