konrads@coltsfoot:/usr/local/lib/libgphoto2/2.2.1$ strace -o /tmp/gphoto2-st -- /usr/local/bin/gphoto2 --port "usb:" --summary --auto-detect

*** Error ***
This camera does not support summaries.
Model                          Port
----------------------------------------------------------
Mass Storage Camera            disk:/media/usbdisk
Canon PowerShot A95 (PTP mode) usb:
Canon PowerShot A95 (PTP mode) usb:005,004