MTP, libgphoto2 & KFM

[Weng Xuetian]

As far as I know, this is the limitation of libmtp. There is no
"mount" for mtp in kio, it's just a standalone kio process talking to
it. As you can see, even for gvfs it is possible that you need to
manually kill some process.

http://sourceforge.net/p/libmtp/code/ci/master/tree/README#l165

Kill the kio process of mtp might help to release the device.

On Sat, Dec 5, 2015 at 3:21 AM, Damon Lynch <damonlynch at gmail.com> wrote:
> Hello,
>
> I'm developing a FOSS application [1] (Qt 5, python 3.4) that uses
> libgphoto2 to access cameras and camera-like devices, including smart phones
> / tablets that connect via MTP.
>
> I have noticed that when Dolphin has accessed the contents of an MTP device,
> libgphoto2 is unable to access the device, even if Dolphin browsing another
> location e.g. the user's home directory. The device becomes free when
> Dolphin is closed.
>
> To test this, do these steps:
>
> 1. To confirm the MTP device is accessible by libgphoto2, plug in an
> unlocked android 4.0 + phone (for example), and from a terminal execute
> gphoto2 --list-folders
>     That should work.
> 2. Open Dolphin and browse some folders on the phone.
> 3. Repeat step 1 while Dolphin is open. It fails.
>
> I am unaware of a way for the user to do the equivalent of a virtual
> "unmount" to ask Dolphin/Kdeinit5 via the GUI to relinquish exclusive
> control of the device. Is there a way, either through the GUI or the command
> line? GVFS supplies such a feature. I tried solid-hardware unmount udi
> (supplying the correct UDI), but solid-hardware reported the MTP device
> 'does not have the interface StorageAccess".
>
> Is there a way request kdeinit5 to relinquish exclusive control of the
> device from python code? It would be great if my application could
> automatically do a virtual "unmount" of the device so it can access it,
> without user intervention.
>
> Is there a case to be made for KDE applications to provide a virtual
> "unmount" of MTP and perhaps also PTP devices in its GUI?
>
> Thanks.
>
> Damon
>
> [1] https://code.launchpad.net/~dlynch3/rapid/zeromq_pyqt
>
> --
>
> http://www.damonlynch.net
>