On Fri, 2017-06-02 at 15:10 +0200, Gregor Jasny wrote:
> Hello,
> 
> On 6/2/17 12:24 PM, Victor Porton wrote:
> > libv4l2: error turning on stream: Input/output error
> > libv4l2: error turning on stream: Input/output error
> 
> are there any errors in the Kernel message buffer visible? Please
> type
> dmesg and look for errors.

I found no relevant errors. I looked for "video" and "v4l" strings.

> Could you please try qv4l2 and check if it displays proper video?

It prints

libv4l2: error turning on stream: Input/output error
VIDIOC_STREAMON: Input/output error

and displays a window whose content is entirely black.

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