Framerate is consistently divided by 2.5

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Hi,

After patching the kernel, the rate that images are captured from the
camera reduce by a factor of 2.5. Here are a list of frame rates I
have tried followed by the resulted frame-rate:

10 fps --> 4 fps
15 fps --> 6 fps
25 fps --> 10 fps
30 fps --> 12 fps

Note that all of the rates are consistently divided by 2.5. This seems
to be a clocking issue to me. Is there any multipliers in V4L2 (or
UVC?) code in framerate calculation which depends on the hardware and
be cause of this?

Bests,
Isaac
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