Well, it turned out that I was using an USB3 port while my version of
libgphoto works fine only with USB2:
http://sourceforge.net/mailarchive/forum.php?thread_name=CAPjDBppty2MmCJWCpWY_Ko7PTZqk7nQ_9CN8C%2Br38eLy_6xJqg%40mail.gmail.com&forum_name=gphoto-user
As you can read there:
We had an issue in the kernel and in libgphoto2 where on USB 3 ports
it would only take 1 connection and then hang (needed a replugging in).
libgphoto2 2.5.2 has fixed this.
2013/10/21 Federico Bruni <[email protected]>
> Hi
>
> I'm following the user manual:
> http://www.darktable.org/usermanual/ch04s04.html.php#d0e6504
>
> and I can run any command except:
>
> gphoto2 --capture-tethered
>
> IIUC, I should click on the shooting button on the camera and the image
> should be downloaded on the disk. But I get an error:
>
> *** Error ***
> PTP I/O error
> libusbx: debug [libusb_release_interface] interface 0
> libusbx: debug [libusb_close]
> libusbx: debug [usbi_remove_pollfd] remove fd 11
>
> *** Error ***
> An error occurred in the io-library ('Unspecified error'): No error
> description available
> *** Error (-1: 'Unspecified error') ***
>
>
> Nikon D5000 uses only PTP.
> AFAICS, the camera is supported:
> http://www.gphoto.org/doc/remote/
>
> I'm using this debian package:
>
> $ apt-cache policy libgphoto2-2
> libgphoto2-2:
> Installed: 2.4.14-2.3
> Candidate: 2.4.14-2.3
> Version table:
> *** 2.4.14-2.3 0
> 900 http://http.debian.net/debian/ unstable/main amd64 Packages
> 100 /var/lib/dpkg/status
>
> Any help appreciated.
> I'm giving a talk about Darktable at Linux Day in Florence next Saturday.
> I hope I can solve this issue.. or maybe I'll use another camera which I'm
> sure it works.
>
> Thanks
> Federico
>
>
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