lsusb
dmesg
xawtv -hwscan

Röviden ez az út, amit érdemes bejárni. (xawtv helyett motv is jó.)

# lsusb
Bus 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 0c45:60b0 Microdia Genius VideoCam Look
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

xawtv -hwscan
This is xawtv-3.95.dfsg.1, running on Linux/x86_64 (2.6.26-1-amd64)
looking for available devices
/dev/video0: OK                        [ -device /dev/video0 ]
    type : v4l2
    name : SN9C1xx PC Camera
    flags:  capture

Aztán csak feketeséget látok:
# xawtv
This is xawtv-3.95.dfsg.1, running on Linux/x86_64 (2.6.26-1-amd64)
xinerama 0: 1280×1024+0+0
WARNING: No DGA support available for this display.
/dev/video0 [v4l2]: no overlay support
v4l-conf had some trouble, trying to continue anyway
Warning: Cannot convert string „-*-ledfixed-medium-r-*–39-*-*-*-c-*-*-*” to type FontStruct
ioctl: VIDIOC_G_STD(std=0x7fcfe663788a [PAL_B1,PAL_H,PAL_K,PAL_60,NTSC_M,NTSC_M_JP,?,SECAM_B,SECAM_D,SECAM_K1,SECAM_L,(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null)]): Érvénytelen paraméter
ioctl: VIDIOC_S_STD(std=0x0 []): Érvénytelen paraméter
no way to get: 384×288 32 bit TrueColor (LE: bgr-)

xawtv -nodga

# xawtv -nodga
This is xawtv-3.95.dfsg.1, running on Linux/x86_64 (2.6.26-1-amd64)
xinerama 0: 1280×1024+0+0
WARNING: No DGA support available for this display.
/dev/video0 [v4l2]: no overlay support
v4l-conf had some trouble, trying to continue anyway
Warning: Cannot convert string „-*-ledfixed-medium-r-*–39-*-*-*-c-*-*-*” to type FontStruct
ioctl: VIDIOC_G_STD(std=0x7f49222aa88a [PAL_B1,PAL_H,PAL_K,PAL_60,NTSC_M_JP,?,SECAM_D,SECAM_H,SECAM_K1,(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null)]): Érvénytelen paraméter
ioctl: VIDIOC_S_STD(std=0x0 []): Érvénytelen paraméter
no way to get: 384×288 32 bit TrueColor (LE: bgr-)

Csak feketeség, mint korábban 🙁

Ha szeretsz forrást patchelni:
http://www.linux-projects.org/modules/newbb/viewtopic.php?forum=3&topic_id=229