I won't change my entire system from Nouveau to Nvidia just to experiment with the camera (especially because the problem seems unrelated with the display).
I looked like a black man in Cheese. The problem is (mostly) already resolved however.
sudo uvcdynctrl -s 'Backlight Compensation' 10
more or less solves the problem (I am no more a black man), but it is just a hack: when I move before the camera, the brightness yet "jumps" sometimes.
Any proper way to configure it?
I've bought SIGMA HD WEBCAM (8mp, USB).
Works right after connecting to Ubuntu Linux 18.10. (Some minor Skype config required.)
It seems to automatically adjust the brightness (as the brightness "jumps" as I move before the camera) and does it wrong (cheked in Skype and Cheese). It makes me to...