Hi Oleksandr On Mon, 25 Mar 2024 at 10:23, Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx> wrote: > > 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? Looks like it.... could you try applying this patch and run with rmmod uvcvideo; modprobe uvcvideo hwtimestamps=1 quirks=0x4000 to see if that fixes it for you? Thanks! > > Thank you. > > > > > > > Thanks! > > > > > -- > Oleksandr Natalenko (post-factum) -- Ricardo Ribalda
