Comment 12 for bug 910964

But then I tried shotwell again (without unplugging anything or resetting anything) and it gave the same error, then back to gphoto2 and received the following error (it hung as I was typing):
$ gphoto2 --shell
gphoto2: {/home/myusername} /> cd s
*** Error ***
PTP I/O error

*** Error ***
An error occurred in the io-library ('Unspecified error'): The supplied vendor or product id (0x0,0x0) is not valid.
ssto
ERROR: Invalid command.

I note that I imported all the photos on this camera from a card with 8 photos and it worked fine, so either more photos makes it worse, or there is something else that makes it work sometimes and not others.

Either way, it does look like this hits gphoto2 as well.