linux-kernel - Re: [PATCH v10 3/6] media: uvcvideo: Quirk for invalid dev

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Message-ID: <CANiDSCsnOdTaW0Eg68+-niPXwPhYc3Br6cWoGiHytZrFOGmcZA@mail.gmail.com>
Date: Mon, 25 Mar 2024 08:52:57 +0100
From: Ricardo Ribalda <ribalda@...omium.org>
To: Oleksandr Natalenko <oleksandr@...alenko.name>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...r.kernel.org, 
	linux-kernel@...r.kernel.org, "hn.chen" <hn.chen@...plusit.com>, 
	Hans Verkuil <hverkuil@...all.nl>, Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH v10 3/6] media: uvcvideo: Quirk for invalid dev_sof in
 Logitech C922

Hi Oleksandr

On Sat, 23 Mar 2024 at 13:16, Oleksandr Natalenko
<oleksandr@...alenko.name> wrote:

>
> How do I check whether C920 (046d:082d) is affected too? I have got one, I can run tests on it as long as those will not blow the webcam up.
>
> Thanks.
>

First of all you need to enable the hwtimestamps in the driver. You
could do that with

```
rmmod uvcvideo; modprobe uvcvideo hwtimestamps=1
```

Then capture some frames with yavta
```
yavta -c /dev/video0
```

After around 5 seconds all the frames should have a stable fps, the
fps is not stable then your camera is affected with this bug.


Thanks!