ok, it's a uvcvideo capable webcam and it looks like the modules loaded. is it a possibility that the picture settings of the webcam are just really dark? have you checked this out yet?
i have a logitch c260 and I use guvcview to capture facecam's and such and I never have a problem with skype. what version of skype are you using and where did you DL it from? can you please try out guvcview and see if you have a black screen there as well? and or try to issue
do you see a light come on on the webcam letting you know it's recording? after a minute or so, click ctrl-c for it to stop recording. now try to play that file using whatever media player you have installed. it's a file called webcam1.ts and would be located within whatever working directory you were in when you ran the command line command. (most likely your home directory.)
cat /dev/video0 > webcam1.ts