(bisected) Logitech C920 (uvcvideo) stutters since 3.9

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Hi,

There is periodic stutter (seen in vlc, for example) since 3.9 where
the stream stops for around half a second every 3-5 seconds or so.
Bisecting points to 1b18e7a0be859911b22138ce27258687efc528b8 "v4l:
Tell user space we're using monotonic timestamps". I've verified the
problem is there on stock Ubuntu 14.04 kernel, 3.16.7 from kernel.org
and when using media_build.git . The commit does not revert on newer
kernels as that code changed, but checking out a commit before the one
mentioned gives properly working kernel.

I'm using Logitech C920 which can do h264 compression and playing the
video using vlc:
cvlc v4l2:///dev/video0:chroma=h264:width=1280:height=720

-- 
Gražvydas
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