hdpvr Input/output error on cat /dev/video0[solved]

[newtonian]

Hi -

I bought a Haughpauge hdpvr (usb) to record video to my hard disk.
I think I should be able to simply run this command and have video written to a file:

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cat /dev/video1 > test.ts

However when I run this command when I get this:

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cat /dev/video0 > test.ts
cat: /dev/video0: Input/output error

I'm thinking that it is just a misconfigured kernel but I'm not sure where to go from here to debug.
Here are the modules that show up right now in my 2.6.30-gentoo-r8 kernel:

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zebra log # lsmod
Module                  Size  Used by
nvidia               7220220  28 
hdpvr                  18420  0 
v4l2_common            11956  1 hdpvr
videodev               29704  2 hdpvr,v4l2_common
i2c_nforce2             6320  0 

I downloaded and installed the latest firmware as per the myth-tv hdpvr guide.
http://www.mythtv.org/wiki/Hauppauge_HD-PVR


here is my dmesg:

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[    6.257746] i2c-adapter i2c-0: nForce2 SMBus adapter at 0x4d00
[    6.257805] i2c-adapter i2c-1: nForce2 SMBus adapter at 0x4e00
[    6.339131] Linux video capture interface: v2.00
[    6.361815] hdpvr 1-6:1.0: usb_probe_interface
[    6.361826] hdpvr 1-6:1.0: usb_probe_interface - got id
[    6.365623] hdpvr 1-6:1.0: untested firmware version 0x12, the driver might not work
[    6.390596] usb 4-4:1.0: uevent
[    6.390972] usb 4-4: uevent
[    6.407392] usb 4-4:1.0: uevent
[    6.407787] usb 4-4: uevent
[    6.637402] hdpvr 1-6:1.0: device now attached to /dev/video0
[    6.637472] usbcore: registered new interface driver hdpvr
[    7.178694] path_id used greatest stack depth: 4828 bytes left
[    7.362609] nvidia: module license 'NVIDIA' taints kernel.
[    7.362619] Disabling lock debugging due to kernel taint
[    7.458709] usb 1-6:1.0: uevent
[    7.459053] usb 1-6: uevent
[    7.658619] ACPI: PCI Interrupt Link [SGRU] enabled at IRQ 23

Any hints appreciated.

Cheers,

[newtonian]

Had some help from the mythtv-users forum and figured out the problem.

It was probably a bad video cable or poor connection to my video input. I changed the video input with modprobe and got it to work. Here's what I did:

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rmmod hdpvr #remove the module
modprobe hdpvr hdpvr_debug=7 # re-add hdpvr module with increased debug

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tail -f /var/log/kernel/current #watched for hdpvr debug messages in log
found this is log: hdpvr 1-3:1.0: no valid video signal or device init failed

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rmmod hdpvr # removed the module to try on a different input
modprobe hdpvr hdpvr_debug=1 default_video_input=1 #reset to s-video

And all was right in the world.

Cheers,