How to catch information from a device?
I'm playing with an old VGA webcam and I'm not an expert with Linux.
My question is: is there any way to get some information about what's happening to the camera?
I mean: on the top of my webcam there's a button but nothing happens if I try to push it whilst, say, `cheese` is opened, for instance.
Moreover, if I launch from the shell dmesg that's the output -since the moment I plug the webcam-
but nothing more is printed out if then I push the button which is on the top of the webcam. Why? I mean, is dmesg the right tool to investigate this kind of information, or it's the webcam that does not react?
[ 4636.720294] usb 2-1.2: new full-speed USB device number 4 using ehci_hcd
[ 4636.814502] usb 2-1.2: New USB device found, idVendor=093a, idProduct=2600
[ 4636.814508] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4636.814511] usb 2-1.2: Product: VGA Single Chip
[ 4636.814514] usb 2-1.2: Manufacturer: Pixart Imaging Inc.
[ 4636.814904] gspca_main: pac7311-2.14.0 probing 093a:2600
[ 4636.817089] input: pac7311 as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/input/input13
Note: I'm using Ubuntu 12.10 (64 bit).