linux-kernel - Re: [PROBLEM] uvcvideo: Failed to query (GET

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Date:   Mon, 9 Dec 2019 03:18:04 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jeffrin Jose <jeffrin@...agiritech.edu.in>
Cc:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] uvcvideo: Failed to query (GET_INFO) UVC control

Hello Jeffrin,

On Sat, Dec 07, 2019 at 11:51:52PM +0530, Jeffrin Jose wrote:
> hello,
> 
> i get this  output piece from "dmesg -l err" of kernel 5.4.2
> 
> 
> -------------------x---------------------------x------------------
> uvcvideo: Failed to query (GET_INFO) UVC control 6 on unit 1: -32 (exp. 1).
> uvcvideo: Failed to query (GET_INFO) UVC control 7 on unit 1: -32 (exp. 1).
> -------------------x----------------------------x-----------------
> 
> Additional information:
> Linux debian 5.4.2 #17 SMP Sat Dec 7 01:39:12 IST 2019 x86_64 GNU/Linux
> 
> Relevant file:
> drivers/media/usb/uvc/uvc_video.c

Does the camera otherwise fail to operate correctly ? Was the problem
present in older kernel versions, or did it appear with v5.4.2 ? Are the
above messages output every time you plug the camera (or load the driver
in case the camera is built in), or only randomly ? What is the exact
camera model, and could you please send me the lsusb -v output for it
(running as root if possible) ?

-- 
Regards,

Laurent Pinchart