Re: [Linux-uvc-devel] [SVN] Made kernel logging more modular

[Laurent P. <lau...@sk...>]

> Is it possible to add a new trace to be able to see the resolution
> supported by the webcam. Sometimes the YUYV format is not reported because
> i've a mouse on the same usb bus, or i don't remember the resolution.

> Why not return -ENOBUFS when the queue is empty (when dequeing frame) ?
> Please see the path attached.

(From the V4L2 specs, VIDIOC_DQBUF)

EINVAL
    The buffer type is not supported, or the index is out of bounds, or no
    buffers have been allocated yet, or the userptr or length are invalid.

That's why :-)

I'll add the supported resolutions to the UVC_TRACE_DESCR trace. You can also 
use lsusb to read the USB descriptors directly.

Laurent Pinchart