thank you, lagagnon.
libgphoto2 version in VL soho 5.8 iso is 2.2, I updated it to 2.3 through slapt-get from 5.8's pool, then I can find F30 in the camera list.
But, I tried all ways to access my f30 camera, it always tell me "failed to access the camera, please ensure the device was connected to computer correctly".
In fact the connection is no problem. I kept the camera's line untouched, and rebooted to pclinuxos and its digikam can work well with my camera.
For this problem, I've re-installed the system a few times, but it is not solved yet.