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From: Ricardo Ribalda <ribalda@chromium.org>
To: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	 Mauro Carvalho Chehab <mchehab@kernel.org>,
	linux-media@vger.kernel.org,  linux-kernel@vger.kernel.org,
	"hn.chen" <hn.chen@sunplusit.com>,
	 Hans Verkuil <hverkuil@xs4all.nl>,
	Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: Re: [PATCH v10 3/6] media: uvcvideo: Quirk for invalid dev_sof in Logitech C922
Date: Mon, 25 Mar 2024 08:52:57 +0100	[thread overview]
Message-ID: <CANiDSCsnOdTaW0Eg68+-niPXwPhYc3Br6cWoGiHytZrFOGmcZA@mail.gmail.com> (raw)
In-Reply-To: <2722561.mvXUDI8C0e@natalenko.name>

Hi Oleksandr

On Sat, 23 Mar 2024 at 13:16, Oleksandr Natalenko
<oleksandr@natalenko.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!

  reply	other threads:[~2024-03-25  7:53 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-23 10:48 [PATCH v10 0/6] uvcvideo: Fixes for hw timestamping Ricardo Ribalda
2024-03-23 10:48 ` [PATCH v10 1/6] media: uvcvideo: Support timestamp lists of any size Ricardo Ribalda
2024-03-23 10:48 ` [PATCH v10 2/6] media: uvcvideo: Ignore empty TS packets Ricardo Ribalda
2024-03-23 10:48 ` [PATCH v10 3/6] media: uvcvideo: Quirk for invalid dev_sof in Logitech C922 Ricardo Ribalda
2024-03-23 12:16   ` Oleksandr Natalenko
2024-03-25  7:52     ` Ricardo Ribalda [this message]
2024-03-25  9:23       ` Oleksandr Natalenko
2024-03-25  9:25         ` Ricardo Ribalda
2024-03-25 12:50           ` Oleksandr Natalenko
2024-03-25 14:13             ` Ricardo Ribalda
2024-03-23 10:48 ` [PATCH v10 4/6] media: uvcvideo: Allow hw clock updates with buffers not full Ricardo Ribalda
2024-03-23 10:48 ` [PATCH v10 5/6] media: uvcvideo: Refactor clock circular buffer Ricardo Ribalda
2024-03-23 10:48 ` [PATCH v10 6/6] media: uvcvideo: Fix hw timestamp handling for slow FPS Ricardo Ribalda

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