this is the beginning of the dmesg output:
http://dv6597.netia.es/up/dmesg.r74.init

after a while seeing myself xawtv halted with this error:

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):
Error de entrada/salida
v4l2: read: Error de entrada/salida

and dmesg output (end of it)

[ 5072.644000] r5u870-0: urbstream[6] processing f6343f60
[ 5072.648000] r5u870-0: urbstream[6] urb complete: f6343ba0/0
[ 5072.648000] r5u870-0: urbstream[6] processing f6343ba0
[ 5072.648000] r5u870-0: capture abort: too many empty pkts
[ 5072.648000] r5u870-0: urbstream[6] stopping
[ 5072.652000] r5u870-0: urbstream[6] urb complete: f6343b40/0
[ 5072.652000] r5u870-0: urbstream[6] request canceled, ignoring
[ 5072.656000] r5u870-0: urbstream[6] urb complete: f6343f60/0
[ 5072.656000] r5u870-0: urbstream[6] request canceled, ignoring
[ 5072.656000] r5u870-0: urbstream[6] stopped
[ 5072.656000] r5u870-0: minidriver aborting all frames
[ 5072.656000] r5u870-0: completing frame 0 STATE_ERROR
[ 5072.656000] r5u870-0: urbstream[6] stopping
[ 5072.656000] r5u870-0: urbstream[6] stopped