tom@crustycrab:~$ dmesg | grep -i "ivtv"
[ 15.896527] ivtv: Start initialization, version 1.4.1
[ 15.896591] ivtv0: Initializing card 0
[ 15.896593] ivtv0: Autodetected Hauppauge card (cx23416 based)
[ 16.000283] ivtv 0000:02:08.0: PCI INT A -> Link[LNKA] -> GSI 19 (level, low) -> IRQ 19
[ 16.059888] ivtv0: Autodetected WinTV PVR 500 (unit #1)
[ 16.080562] cx25840 2-0044: cx25843-24 found @ 0x88 (ivtv i2c driver #0)
[ 16.099907] tuner 2-0060: chip found @ 0xc0 (ivtv i2c driver #0)
[ 16.121582] tuner 2-0043: chip found @ 0x86 (ivtv i2c driver #0)
[ 16.131488] tuner 2-0061: chip found @ 0xc2 (ivtv i2c driver #0)
[ 16.133357] wm8775 2-001b: chip found @ 0x36 (ivtv i2c driver #0)
[ 16.150923] IRQ 19/ivtv0: IRQF_DISABLED is not guaranteed on shared IRQs
[ 16.151174] ivtv0: Registered device video0 for encoder MPG (4096 kB)
[ 16.151216] ivtv0: Registered device video32 for encoder YUV (2048 kB)
[ 16.151255] ivtv0: Registered device vbi0 for encoder VBI (1024 kB)
[ 16.151293] ivtv0: Registered device video24 for encoder PCM (320 kB)
[ 16.151331] ivtv0: Registered device radio0 for encoder radio
[ 16.151333] ivtv0: Initialized card: WinTV PVR 500 (unit #1)
[ 16.151380] ivtv1: Initializing card 1
[ 16.151382] ivtv1: Autodetected Hauppauge card (cx23416 based)
[ 16.151697] ivtv 0000:02:09.0: PCI INT A -> Link[LNKB] -> GSI 17 (level, low) -> IRQ 17
[ 16.210386] ivtv1: Correcting tveeprom data: no radio present on second unit
[ 16.210388] ivtv1: Autodetected WinTV PVR 500 (unit #2)
[ 16.213567] cx25840 3-0044: cx25843-24 found @ 0x88 (ivtv i2c driver #1)
[ 16.224606] tuner 3-0043: chip found @ 0x86 (ivtv i2c driver #1)
[ 16.226765] tuner 3-0061: chip found @ 0xc2 (ivtv i2c driver #1)
[ 16.227545] wm8775 3-001b: chip found @ 0x36 (ivtv i2c driver #1)
[ 16.238220] IRQ 17/ivtv1: IRQF_DISABLED is not guaranteed on shared IRQs
[ 16.238472] ivtv1: Registered device video1 for encoder MPG (4096 kB)
[ 16.238512] ivtv1: Registered device video33 for encoder YUV (2048 kB)
[ 16.238552] ivtv1: Registered device vbi1 for encoder VBI (1024 kB)
[ 16.238590] ivtv1: Registered device video25 for encoder PCM (320 kB)
[ 16.238592] ivtv1: Initialized card: WinTV PVR 500 (unit #2)
[ 16.238633] ivtv: End initialization
[ 16.860017] ivtv 0000:02:09.0: firmware: requesting v4l-cx2341x-enc.fw
[ 16.936352] ivtv 0000:02:08.0: firmware: requesting v4l-cx2341x-enc.fw
[ 16.946688] ivtv1: Loaded v4l-cx2341x-enc.fw firmware (376836 bytes)
[ 16.957548] ivtv0: Loaded v4l-cx2341x-enc.fw firmware (376836 bytes)
[ 17.145190] ivtv1: Encoder revision: 0x02060039
[ 17.157768] ivtv0: Encoder revision: 0x02060039

tom@crustycrab:~$ ls /dev/vi* -l
crw-rw----+ 1 root video 81, 0 2010-07-23 01:03 /dev/video0
crw-rw----+ 1 root video 81, 5 2010-07-23 01:03 /dev/video1
crw-rw----+ 1 root video 81, 3 2010-07-23 01:03 /dev/video24
crw-rw----+ 1 root video 81, 8 2010-07-23 01:03 /dev/video25
crw-rw----+ 1 root video 81, 1 2010-07-23 01:03 /dev/video32
crw-rw----+ 1 root video 81, 6 2010-07-23 01:03 /dev/video33

v4l2-ctl -v width=720,height=480
v4lctl setinput "Composite 1"
ivtv-tune -c1
aplay -q --buffer-time=100 -f dat /dev/video24 &
mplayer -rawvideo format=hm12:h=480:w=720:fps=29.97 -nocache -demuxer 26 /dev/video32 -framedrop -vo xv -monitoraspect 16:10 -aspect 4:3
killall aplay