I installed Cyanogen Mod 11 on Nexus 7 tablet (2013 version), and enabled MTP access to storage in settings there (USB access is removed in that version). After that, when plugged into a USB, the device appears in KDE (current Debian testing) as "camera" device. I can delete files there, but when I try to copy anything from my computer to the device, it fails with KDE showing a message "writing to camera not supported". Am I missing something there, or MTP access doesn't allow transfer?

Thanks.

UPDATE1: Actually, device notifier shows two "File Manager" actions. First opened "camera" device, and second just did nothing. I found this advice: http://forums.opensuse.org/showthread.p ... ansfer-fix
Changing in /usr/share/kde4/apps/solid/actions/solid_mtp.desktop

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Exec=kioclient exec mtp:udi=%i/

to

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Exec=dolphin "mtp:/"

Made second File Manager option to work and now I can transfer files. For some reason it doesn't work with the root (Internal storage), but works with subdirectores.

About the above change. Is this a bug in KDE, or something is wrong with Debian?

The "Camera" interface is using the PTP protocol - it is likely that Android's implementation of PTP (upon which MTP is based I believe) is lacking the lower level bits it requires to upload files.

As an alternative, can you try installing kio_mtp and using it instead to access your device?

See my updated post, I found a workaround.

The above change you mentioned is likely a bug in KDE - specifically the MTP KIOSlave, as it is shipping a rule which doesn't work correctly.
Please file a bug at bugs.kde.org regarding that so it can be corrected.

Sure, I'll file a bug. Just for the reference, I also installed kio-mtp package, since it wasn't included in Debian/KDE by default (that's what brings in that .desktop file).