I couldn't write to that debug file, no matter what. I hope these commands are 
equivalent:

sudo service mythtv-backend stop
sudo modprobe -r cx18
sudo modprobe cx18 debug=15
v4l2-ctl -i 1
mplayer /dev/video0 -cache 16384
mplayer /dev/video0

> How rapidly does the A-V difference grow with unbuffered playback? With 
> buffered playback, how rapidly does the cache fill sink to 0%?

Unbuffered: A-V reaches 10 in as fast as 30 seconds:

Too many video packets in the buffer: (4096 in 7965612 bytes).
Maybe you are playing a non-interleaved stream/file or the codec failed?
For AVI files, try to force non-interleaved mode with the -ni option.
Cannot sync MAD frame
A:  45.2 V:  35.0 A-V: 10.198 ct:  1.519 1026/1026  3%  0% 91.9% 266 0 

Buffered: cache reaches 0 in 2 min 30 sec:

Too many video packets in the buffer: (4096 in 7959616 bytes).
Maybe you are playing a non-interleaved stream/file or the codec failed?
For AVI files, try to force non-interleaved mode with the -ni option.
Cannot sync MAD frame
A: 292.7 V: 282.5 A-V: 10.188 ct: 12.419 8460/8460  3%  0% 24.8% 176 0 0% 

> With those debug settings I mentioned above, how often in the log to you get 
> the  "Possibly falling behind" messages and messages about putting buffers 
> back into rotation?

I see only two "Possibly falling behind" messages and none about putting 
buffers back into rotation. I have attached the dmesg log.

> I would think that sharing an interrupt with the nvidia hardware/driver is 
> not what you want to do.  Maybe changing to a slot that doesn't use that PCI 
> IRQ line would help.  Note slots 4 and slot 5 in a chassis may not rotate the 
> interrupt line traces on the motherboard, so changing between those slots 
> won't help.

I moved the card to 18, but don't see any effect on the video.

[EMAIL PROTECTED]:~$ grep cx18 /proc/interrupts
 18:       4608       4582   IO-APIC-fasteoi   uhci_hcd:usb3, ehci_hcd:usb4, 
uhci_hcd:usb7, cx18-0

What I find strange is how things work fine from the tuner card but not 
s-video. I mean, its basically the same video stream. Different code I guess? 
If the quality wasn't so poor on the tuner card, that would be my solution! 
Thanks again.
_________________________________________________________________

[  140.751487] cx18:  Start initialization, version 1.0.3
[  140.751538] cx18-0: Initializing card #0
[  140.751539] cx18-0: Autodetected Hauppauge card
[  140.751541] cx18-0 info: base addr: 0xf8000000
[  140.751543] cx18-0 info: Enabling pci device
[  140.751552] cx18 0000:05:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[  140.751561] cx18-0 info: cx23418 (rev 0) at 05:00.0, irq: 16, latency: 64, 
memory: 0xf8000000
[  140.751563] cx18-0 info: attempting ioremap at 0xf8000000 len 0x04000000
[  140.752394] cx18-0: cx23418 revision 01010000 (B)
[  140.849372] cx18-0 info: GPIO initial dir: 0000cffe/0000ffff out: 
00003001/00000000
[  140.849381] cx18-0 info: activating i2c...
[  140.928052] cx18-0 info: Active card count: 1.
[  140.969354] cx18-0: Autodetected Hauppauge HVR-1600
[  140.969355] cx18-0 info: NTSC tuner detected
[  140.969356] cx18-0: VBI is not yet supported
[  141.043237] cx18-0 info: Loaded module tuner
[  141.045828] cx18-0 info: Loaded module cs5345
[  141.046877] tuner 1-0061: chip found @ 0xc2 (cx18 i2c driver #0-1)
[  141.046892] cs5345 0-004c: chip found @ 0x98 (cx18 i2c driver #0-0)
[  141.049826] cx18-0 info: Allocate encoder MPEG stream: 63 x 32768 buffers 
(2016kB total)
[  141.049861] cx18-0 info: Allocate TS stream: 32 x 32768 buffers (1024kB 
total)
[  141.049877] cx18-0 info: Allocate encoder YUV stream: 16 x 131072 buffers 
(2048kB total)
[  141.049889] cx18-0 info: Allocate encoder PCM audio stream: 63 x 16384 
buffers (1008kB total)
[  141.049921] cx18-0: Disabled encoder IDX device
[  141.049989] cx18-0: Registered device video0 for encoder MPEG (2 MB)
[  141.049991] DVB: registering new adapter (cx18)
[  141.090124] cx18-0 info: load segment a00000-a07fff
[  141.100760] cx18-0: DVB Frontend registered
[  141.100782] cx18-0: Registered device video32 for encoder YUV (2 MB)
[  141.100806] cx18-0: Registered device video24 for encoder PCM audio (1 MB)
[  141.100808] cx18-0: Initialized card #0: Hauppauge HVR-1600
[  141.100821] cx18:  End initialization
[  141.115732] cx18-0 info: load segment ae0000-ae00ff
[  141.115910] cx18-0 info: load segment b00000-b1a65f
[  141.189087] cx18-0: loaded v4l-cx23418-apu.fw firmware V00120000 (141200 
bytes)
[  141.796728] cx18-0: loaded v4l-cx23418-cpu.fw firmware (158332 bytes)
[  141.801495] cx18-0 info: 1 MiniMe Encoder Firmware 0.0.74.0 (Release 
2007/03/12)
[  141.801500] cx18-0: FW version: 0.0.74.0 (Release 2007/03/12)
[  142.002336] cx18-0 info: load segment a00000-a07fff
[  142.024527] cx18-0 info: load segment ae0000-ae00ff
[  142.024702] cx18-0 info: load segment b00000-b1a65f
[  142.710674] cx18-0 info: 1 MiniMe Encoder Firmware 0.0.74.0 (Release 
2007/03/12)
[  142.904012] cx18-0 info: Changing input from 1 to 0
[  142.904016] cx18-0 info: Mute
[  142.904019] cx18-0 info: cmd 4008646f triggered fw load
[  143.087888] cx18-0: loaded v4l-cx23418-dig.fw firmware (16382 bytes)
[  143.087931] cx18-0 info: decoder set video input 7, audio input 8
[  143.089357] cx18-0 info: decoder set video input 7, audio input 8
[  143.089435] cx18-0 api: CX18_APU_RESETAI
[  143.090125] cx18-0 api: mailbox error 200800ff for command CX18_APU_RESETAI
[  143.090129] cx18-0 info: Unmute
[  143.090132] cx18-0 info: Switching standard to 1000.
[  143.090134] cx18-0 info: changing video std to fmt 1
[  143.090150] cx18-0 info: PLL regs = int: 15, frac: 2876158, post: 4
[  143.090152] cx18-0 info: PLL = 108.000014 MHz
[  143.090154] cx18-0 info: PLL/8 = 13.500001 MHz
[  143.090156] cx18-0 info: ADC Sampling freq = 14.317384 MHz
[  143.090158] cx18-0 info: Chroma sub-carrier freq = 3.579545 MHz
[  143.090161] cx18-0 info: hblank 122, hactive 720, vblank 26 , vactive 487, 
vblank656 26, src_dec 543,burst 0x5b, luma_lpf 1, uv_lpf 1, comb 0x66, sc 
0x087c1f
[  143.095030] cx18-0 info: Mute
[  143.095033] cx18-0 info: v4l2 ioctl: set frequency 1076
[  143.096452] cx18-0 info: Unmute
[  495.399277] cx18-0 info: Changing input from 0 to 1
[  495.399282] cx18-0 info: Mute
[  495.399284] cx18-0 info: decoder set video input 1296, audio input 8
[  495.400487] cx18-0 info: decoder set video input 1296, audio input 0
[  495.400562] cx18-0 api: CX18_APU_RESETAI
[  495.400662] cx18-0 api: mailbox error 200800ff for command CX18_APU_RESETAI
[  495.400664] cx18-0 info: Unmute
[ 1934.190202] cx18-0 info: Start encoder stream encoder MPEG
[ 1934.190207] cx18-0 api: CX18_CPU_SET_VIDEO_MUTE
[ 1934.190341] cx18-0 api: CX18_CREATE_TASK
[ 1934.190395] cx18-0 api: CX18_CPU_SET_CHANNEL_TYPE
[ 1934.190448] cx18-0 api: CX18_CPU_SET_VER_CROP_LINE
[ 1934.190501] cx18-0 api: CX18_CPU_SET_MISC_PARAMETERS
[ 1934.190554] cx18-0 api: CX18_CPU_SET_MISC_PARAMETERS
[ 1934.190626] cx18-0 api: CX18_CPU_SET_MISC_PARAMETERS
[ 1934.190679] cx18-0 api: CX18_CPU_SET_MISC_PARAMETERS
[ 1934.190729] cx18-0 api: CX18_CPU_SET_CAPTURE_LINE_NO
[ 1934.190783] cx18-0 api: CX18_CPU_SET_INDEXTABLE
[ 1934.190837] cx18-0 api: CX18_CPU_SET_VIDEO_IN
[ 1934.190910] cx18-0 api: CX18_CPU_SET_VIDEO_RESOLUTION
[ 1934.190975] cx18-0 api: CX18_CPU_SET_STREAM_OUTPUT_TYPE
[ 1934.191031] cx18-0 api: CX18_CPU_SET_ASPECT_RATIO
[ 1934.191103] cx18-0 api: CX18_CPU_SET_GOP_STRUCTURE
[ 1934.191157] cx18-0 api: CX18_CPU_SET_AUDIO_PARAMETERS
[ 1934.191223] cx18-0 api: CX18_CPU_SET_AUDIO_MUTE
[ 1934.191287] cx18-0 api: CX18_CPU_SET_VIDEO_RATE
[ 1934.191368] cx18-0 api: CX18_CPU_SET_FILTER_PARAM
[ 1934.191424] cx18-0 api: CX18_CPU_SET_FILTER_PARAM
[ 1934.191479] cx18-0 api: CX18_CPU_SET_FILTER_PARAM
[ 1934.191534] cx18-0 api: CX18_CPU_SET_MEDIAN_CORING
[ 1934.191594] cx18-0 api: CX18_CPU_SET_SPATIAL_FILTER_TYPE
[ 1934.191653] cx18-0 api: CX18_CPU_SET_FILTER_PARAM
[ 1934.191707] cx18-0 api: CX18_CPU_SET_FILTER_PARAM
[ 1934.191759] cx18-0 api: CX18_CPU_SET_FILTER_PARAM
[ 1934.191815] cx18-0 api: CX18_CPU_SET_SKIP_INPUT_FRAME
[ 1934.191866] cx18-0 api: CX18_CPU_SET_VIDEO_MUTE
[ 1934.191937] cx18-0 api: CX18_CPU_SET_MISC_PARAMETERS
[ 1934.191995] cx18-0 api: CX18_CPU_DE_SET_MDL_ACK
[ 1934.196333] cx18-0 api: CX18_CPU_CAPTURE_START
[ 1936.905693] cx18-0 warning: Possibly falling behind: CPU self-ack'ed our 
incoming CPU to EPU mailbox (sequence no. 26125)
[ 1936.905699] cx18-0 api: incoming: req 0x0000660d ack 0x0000660d cmd 
0x02040001 err 0x00000000 args 0x00000000 0x00dc0c48 0x00000001 0x00000000 
0x00000000 0x00000000
[ 1942.030431] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 1943.628081] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 1951.252106] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 1953.324145] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 1956.375820] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 1987.445205] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 1992.196778] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 1992.412220] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 2004.621056] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 2022.079030] cx18-0 warning: sending CX18_CPU_DE_SET_MDL timed out waiting 12 
msecs for RPU acknowledgement
[ 2216.658101] cx18-0 warning: Possibly falling behind: CPU self-ack'ed our 
incoming CPU to EPU mailbox (sequence no. 37412)
[ 2216.658109] cx18-0 api: incoming: req 0x00009224 ack 0x00009224 cmd 
0x02040001 err 0x00000000 args 0x00000000 0x00dc0c40 0x00000001 0x00000000 
0x00000000 0x00000000
[ 2220.261901] cx18-0 info: close stopping capture
[ 2220.261908] cx18-0 info: Stop Capture
[ 2220.261911] cx18-0 api: CX18_CPU_CAPTURE_STOP
[ 2220.560012] cx18-0 api: CX18_CPU_DE_RELEASE_MDL
[ 2220.860007] cx18-0 api: CX18_DESTROY_TASK
[ 5593.964025] cx18-0 info: Removing Card #0
[ 5593.964030] cx18-0 info: Stopping all streams
[ 5593.964038] cx18-0 info: Preparing for firmware halt.
[ 5593.965558] cx18-0: unregister DVB
[ 5593.965905] cx18-0 info: releasing enc_mem
[ 5593.966146] cx18 0000:05:00.0: PCI INT A disabled
[ 5593.966148] cx18-0: Removed Hauppauge HVR-1600, card #0
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