Weird green patterns on video

[Alexandre-Xavier L-L]

Hello,

Someone sent me a picture of a device that he tried to add support for
in V4L2. The device causes a kind of diagonal pattern made of green
lines on his image. I wonder what could be causing this. Has anyone
seen this before?

The device is a the first ever model of Ion Video 2 PC that uses a TM6010 chip.

What he got: https://sebbro.nl/ION_Video2PC-TM6010_BOARD_GENERIC.png

Expected result (captured from another device):
https://sebbro.nl/VCR-reference.png

The support for the device was added by adding
{ USB_DEVICE(0x15e4, 0x0140), .driver_info = TM6010_BOARD_GENERIC },
to tm6000-cards.c.

Thanks in advance for any clues.
Alexandre-Xavier