I've got a Casio QV-3000EX camera. I plugged it into my laptop running the
1.5Y snapshot and the following was reported:

umass0 at uhub1 port 1 configuration 1 interface 0
umass0: CASIO product 0x1001, rev 1.00/90.09, addr 2
umass0: using SFF8070i over CBI-I
atapibus1 at umass0 channel 0: 2 targets
probe(umass0:0:0): invalid return code from adapter: 3

Any hints on how to proceed? USB relevant parts of the dmesg follow:

ohci0 at pci0 dev 1 function 2: Silicon Integrated System 5597/5598 USB
host controller (rev. 0x07)
ohci0: interrupting at irq 11
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: Silicon Integra OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 3 ports with 3 removable, self powered
ohci1 at pci0 dev 1 function 3: Silicon Integrated System 5597/5598 USB
host controller (rev. 0x07)
ohci1: interrupting at irq 11
ohci1: OHCI version 1.0, legacy support
usb1 at ohci1: USB revision 1.0
uhub1 at usb1
uhub1: Silicon Integra OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 3 ports with 3 removable, self powered

-- 
Stephen Borrill