Hello. On pondělí 25. března 2024 8:52:57, CET Ricardo Ribalda wrote: > Hi Oleksandr > > On Sat, 23 Mar 2024 at 13:16, Oleksandr Natalenko > <oleksandr@xxxxxxxxxxxxxx> 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 > ``` ``` $ cat /sys/module/uvcvideo/parameters/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. ``` $ ./yavta -c /dev/video1 Device /dev/video1 opened. Device `HD Pro Webcam C920' on `usb-0000:0f:00.3-3.4' (driver 'uvcvideo') supports video, capture, without mplanes. Video format: MJPEG (47504a4d) 1920x1080 (stride 0) field none buffer size 4147200 … 100 (4) [-] none 100 200717 B 212.919114 213.079004 33.727 fps ts mono/SoE 101 (5) [-] none 101 200889 B 213.003703 213.114996 11.822 fps ts mono/SoE 102 (6) [-] none 102 200926 B 213.035571 213.146999 31.379 fps ts mono/SoE 103 (7) [-] none 103 200839 B 213.067424 213.179003 31.394 fps ts mono/SoE 104 (0) [-] none 104 200692 B 213.293180 213.214991 4.430 fps ts mono/SoE 105 (1) [-] none 105 200937 B 213.322374 213.247001 34.254 fps ts mono/SoE 106 (2) [-] none 106 201013 B 213.352228 213.279005 33.496 fps ts mono/SoE … 168 (0) [-] none 168 200914 B 215.183707 215.347066 33.676 fps ts mono/SoE 169 (1) [-] none 169 201141 B 215.271693 215.379066 11.365 fps ts mono/SoE 170 (2) [-] none 170 201005 B 215.303449 215.415057 31.490 fps ts mono/SoE 171 (3) [-] none 171 201195 B 215.335295 215.447062 31.401 fps ts mono/SoE 172 (4) [-] none 172 200933 B 215.557731 215.479072 4.496 fps ts mono/SoE 173 (5) [-] none 173 200973 B 215.587033 215.515063 34.127 fps ts mono/SoE 174 (6) [-] none 174 200698 B 215.616811 215.547063 33.582 fps ts mono/SoE 175 (7) [-] none 175 201290 B 215.646196 215.579075 34.031 fps ts mono/SoE 176 (0) [-] none 176 200807 B 215.675857 215.615073 33.714 fps ts mono/SoE … ``` Does the above mean the webcam is affected? Thank you. > > > Thanks! > -- Oleksandr Natalenko (post-factum)
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