Same problem in my Dell 7520: after taking a photo the message "There was an error playing video from the webcam" appear over a black background.
$ cheese libv4l2: error setting pixformat: Device or resource busy
(cheese:12775): cheese-WARNING **: Device '/dev/video0' is busy: gstv4l2object.c(2838): gst_v4l2_object_set_format (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:camera_source/GstBin:bin18/GstV4l2Src:video_source: Call to S_FMT failed for YU12 @ 1280x720: Device or resource busy
Same problem in my Dell 7520: after taking a photo the message "There was an error playing video from the webcam" appear over a black background.
$ cheese
libv4l2: error setting pixformat: Device or resource busy
(cheese:12775): cheese-WARNING **: Device '/dev/video0' is busy: gstv4l2object. c(2838) : gst_v4l2_ object_ set_format (): /GstCameraBin: camerabin/ GstWrapperCamer aBinSrc: camera_ source/ GstBin: bin18/GstV4l2Sr c:video_ source:
Call to S_FMT failed for YU12 @ 1280x720: Device or resource busy