Hi Gregor, On Thu, Nov 05, 2020 at 08:41:27AM +0100, Gregor Hlawacek wrote: [snip] > Hi Mauro and Laurent > > @Mauro: > > I think there is a confusion, which might be my fault as I talked about > a chicony cam in the external monitor. The chicony cam that shows up as > video0/1 is my internal laptop camera which is working fine. The > problematic one is the sunplusIT camera which has a chicony usb > identifier (0412). This is connected to video2-5 and also the one for > which I reported the above information. > > @Laurent: > > lsusb -v -d 0412:612b: [snip] Thank for the information. Nothing strikes me as weird. Could you - Set the uvcvideo trace parameter to 0xffff: sudo echo 0xffff > /sys/module/uvcvideo/parameters/trace - Unplug and replug the monitor - Open the video devices in turn with v4l2-ctl (use the video device nodes /dev/video* directly, not the by-id links) - Send send the output of 'sudo dmesg' You can clear the kernel log with 'sudo dmesg -c' before doing so to avoid including unrelated data (or just strip it from the dmesg output manually when copying it to an e-mail). -- Regards, Laurent Pinchart
