On Mon, Dec 09, 2019 at 03:18:04AM +0200, Laurent Pinchart wrote:
> 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) ?
>
i think the camera normally work properly.iam sending this mail
because i was looking for error or errors in kernel. i think it started
appearning in the Linux kernel 5.4.2 for me.this is a built in webcam for
my laptop(ASUS VivoBook). i think this may randomly(not sure)  appear.

output files attached
--------------x-------------
$sudo lsusb -v > lsusb.txt
$sudo lsusb -v 2> lsusb-error.txt
-----------x---------------------

some related things...

------------x-----------------x-----------------x--------------
root>cat stats 
frames:  2098
packets: 2105431
empty:   1674589
errors:  0
invalid: 0
pts: 1 early, 2097 initial, 2098 ok
scr: 2098 count ok, 2098 diff ok
sof: 0 <= sof <= 2047, freq 1.000 kHz
root>pwd
/sys/kernel/debug/usb/uvcvideo/1-2-1
root>

$sudo dmesg | grep uvc
[sudo] password for jeffrin: 
[   46.558999] uvcvideo: Found UVC 1.00 device USB2.0 VGA UVC WebCam (13d3:5a11)
[   46.559307] uvcvideo: Failed to query (GET_INFO) UVC control 6 on unit 1: -32 (exp. 1).
[   46.560068] uvcvideo: Failed to query (GET_INFO) UVC control 7 on unit 1: -32 (exp. 1).
[   46.563584] uvcvideo 1-6:1.0: Entity type for entity Extension 4 was not initialized!
[   46.563648] uvcvideo 1-6:1.0: Entity type for entity Processing 2 was not initialized!
[   46.563660] uvcvideo 1-6:1.0: Entity type for entity Camera 1 was not initialized!
[   46.565127] usbcore: registered new interface driver uvcvideo
$
------------------x-----------------x-------------------x--------

--
software engineer
rajagiri school of engineering and technology