In kernel 2.6.19 onwards, two new ioctls were added to the v4l2 API: 
http://www.linuxtv.org/downloads/video4linux/API/V4L2_API/spec/x15102.htm#AEN15973
These may not be available in the R5U870 driver. Yes, they need to be added if 
not present. But, in addition to this; wouldn't it be better if gstreamer 
didn't require these ioctls to be present? If the ioctl faisl, it could revert 
to the old method. The API documentation marks them as experimental, so one 
can't expect it to work with all hardware right now,

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R5U870 webcam not working
https://bugs.launchpad.net/bugs/136625
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