I have a device which has two built-in camera: font and rear (Acer Switch). However, I'm not able to use this second input device in any application, e.g cheese.

Not sure, but looks like a second video input was detected:

$ ls /dev/video*
/dev/video1    /dev/video2

I also tried to record directly from the device using ffmpeg as explained here:

$ ffmpeg -f video4linux2 -s 320x240 -i /dev/video1 out.mp4
... recorded and created file "out.mp4" as expected

$ ffmpeg -f video4linux2 -s 320x240 -i /dev/video2 out.mp4
FAIL: /dev/video2: Inappropriate ioctl for device

Any ideas? Using Ubuntu 18.10 GNOME 3.30.1

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