Problem: saa7113 (saa7115) vs. "conrad usb grabber usb-472"

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System: Debian Jessie x64. (Using qv4l2).

I've got a USB video grabber called "conrad usb grabber usb-472", 
essentially it's a no-name-branding. It's recognized as saa7113 by the 
saa7115 driver.

The device has one video input (chinch, yellow) and a stereo input (red 
and white). The driver does recognize three video inputs 
(green/yellow/red), neither of them works: No frame recognized. I verified 
the camera to supply a correct signal.

Trying to use MMIO, qv4l2 will hang and needs to be killed.
Trying to use read(), I get a black screen.

(Sorry if this isn't the correct list.

I'm OK with just throwing the thing away, but if fixing it is an option, 
I'll help.)

uname -a
Linux be10 3.16.0-4-amd64 #1 SMP Debian 3.16.39-1 (2016-12-30) x86_64 
GNU/Linux


lsusb:
Bus 003 Device 002: ID 0573:0400 Zoran Co. Personal Media Division (Nogatech) D-Link V100

dmesg:
[ 7518.194350] usb 3-2: new full-speed USB device number 2 using ohci-pci
[ 7518.371408] usb 3-2: New USB device found, idVendor=0573, idProduct=0400
[ 7518.371420] usb 3-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 7519.217042] usbvision_probe: D-Link V100 found
[ 7519.217461] USBVision[0]: registered USBVision Video device video1 [v4l2]
[ 7519.217505] usbcore: registered new interface driver usbvision
[ 7519.217507] USBVision USB Video Device Driver for Linux : 0.9.11
[ 7519.902857] saa7115 5-0025: saa7113 found @ 0x4a (usbvision-3-2)



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