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[209.85.221.175]) by smtp.gmail.com with ESMTPSA id 16-20020a056122081000b004d33d93758asm958499vkj.23.2024.03.25.00.53.14 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Mar 2024 00:53:14 -0700 (PDT) Received: by mail-vk1-f175.google.com with SMTP id 71dfb90a1353d-4d44beade3cso1417128e0c.1 for ; Mon, 25 Mar 2024 00:53:14 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCV+Q9kF25AKXOxdOA4Ew03huwjbuhAVQ/GGkJavjgJieWyEJ3QCebA2KB9gPN9VeYhzhb03NZSso7E54gPFaTQ834IfXXI95p14zeA= X-Received: by 2002:a05:6122:468d:b0:4c0:1918:27de with SMTP id di13-20020a056122468d00b004c0191827demr3569976vkb.16.1711353194258; Mon, 25 Mar 2024 00:53:14 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20240323-resend-hwtimestamp-v10-0-b08e590d97c7@chromium.org> <20240323-resend-hwtimestamp-v10-3-b08e590d97c7@chromium.org> <2722561.mvXUDI8C0e@natalenko.name> In-Reply-To: <2722561.mvXUDI8C0e@natalenko.name> From: Ricardo Ribalda Date: Mon, 25 Mar 2024 08:52:57 +0100 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v10 3/6] media: uvcvideo: Quirk for invalid dev_sof in Logitech C922 To: Oleksandr Natalenko Cc: Laurent Pinchart , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, "hn.chen" , Hans Verkuil , Sergey Senozhatsky Content-Type: text/plain; charset="UTF-8" Hi Oleksandr On Sat, 23 Mar 2024 at 13:16, Oleksandr Natalenko 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!