tried with r72.
dmesg out on load:

[ 1739.716000] Linux video capture interface: v2.00
[ 1740.012000] usbcam: registering driver r5u870 0.11.1SVN
[ 1740.012000] r5u870-0: Detected HP Pavilion Webcam (UVC - NO FW)
[ 1740.012000] r5u870-0: Found format 1: YUYV (5 frames)
[ 1740.012000] r5u870-0: Found resolution 1: 640x480 ival 416666
(14745600 B/s)
[ 1740.012000] r5u870-0: Found resolution 2: 352x288 ival 416666
(4866048 B/s)
[ 1740.012000] r5u870-0: Found resolution 3: 320x240 ival 416666
(3686400 B/s)
[ 1740.012000] r5u870-0: Found resolution 4: 176x144 ival 416666
(1216512 B/s)
[ 1740.012000] r5u870-0: Found resolution 5: 160x120 ival 416666
(921600 B/s)
[ 1740.012000] r5u870-0: Found UVC control Hue [-180,180] def:0 info:03
[ 1740.016000] r5u870-0: Added 9 WDM controls
[ 1740.016000] r5u870-0: control Hue/uvc 06 <= 0
[ 1740.016000] r5u870-0: control Brightness <= 63 [capture off]
[ 1740.016000] r5u870-0: control Contrast <= 63 [capture off]
[ 1740.016000] r5u870-0: control White Balance Red <= 127 [capture off]
[ 1740.016000] r5u870-0: control White Balance Green <= 127 [capture off]
[ 1740.016000] r5u870-0: control White Balance Blue <= 127 [capture off]
[ 1740.016000] r5u870-0: control Auto White Balance <= 1 [capture off]
[ 1740.016000] r5u870-0: control V-Flip <= 0 [capture off]
[ 1740.016000] r5u870-0: control H-Flip <= 0 [capture off]
[ 1740.016000] r5u870-0: control Privacy <= 0 [capture off]
[ 1740.016000] r5u870-0: registered as video0
[ 1740.016000] usbcore: registered new interface driver r5u870

Everything seems normal (to me)
Xawtv fails. Xawtv out:

v4l-conf had some trouble, trying to continue anyway
Warning: Cannot convert string
"-*-ledfixed-medium-r-*--39-*-*-*-c-*-*-*" to type FontStruct
ioctl: VIDIOC_S_STD(std=0x0 []): Invalid Argument
ioctl: VIDIOC_DQBUF(index=0;type=VIDEO_CAPTURE;bytesused=0;flags=0x0
[];field=ANY;;timecode.type=0;timecode.flags=0;timecode.frames=0;timecode.seconds=0;timecode.minutes=0;timecode.hours=0;timecode.userbits="";sequence=0;memory=unknown):
Input/Output error
v4l2: read: Input/Output Error

in this point (after xawtv shutdown) dmesg output is in this link:
http://dv6597.netia.es/up/dmesg.r72