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Old 04-22-2022, 07:45 PM   #1
kj76
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Smile Calibre accessing MTP device under KDE5 solution

Hi,

I was having issues accessing my device under KDE with Calibre - I went through the debug device detection, then installed mtp-tools (since that was missing from a fresh Ubuntu install) and was running "mtp-detect" to see what the issue was. After a bit of Google searching I found:

There is a dbus-1 service here (for the most recent KDE5 versions) for the MTP daemon:
/usr/share/dbus-1/services/org.kde.kmtpd5.service

Older versions it might be: org.kde.kmtp.daemon.service

By creating a local file to prevent KDE's mtp daemon from working I did the following (older versions of KDE will be different):
mkdir -p ~/.local/share/dbus-1/services/
nano ~/.local/share/dbus-1/services/org.kde.kmtpd5.service

Add the following text:
[D-BUS Service]
Hidden=true
Name=org.kde.kmtpd5

And save the file - a logout or reboot will then disable the KDE MTP daemon.

Now "mtp-detect" works and so does Calibre
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Old 04-22-2022, 09:48 PM   #2
kovidgoyal
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Yes, on non-windows OSes only one program can access an MTP device at a time. SO you have to prevent your desktop enviroment from automounting MTP devices to use them with calibre. I'm surprised there is not a more user friendly way to exclude mtp devices from being automounted in KDE.
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Old 04-23-2022, 08:50 AM   #3
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It varies by desktop. On some you can switch off MTP automount, either in the control panel or filemanager but on some (Mate on Mint) you can't so I use the System Monitor (accessed by right click at start of task buttons on Place bar) pause the gvf-mtp-volume-monitor before connecting USB. Select processes and find it, right click and Stop (not Kill as it would respawn), which is same as Pausing it.

Some MTP devices will be seen by Calibre simply by right-click and eject on the desktop USB gadget device, works for ancient Sony phone but not Boyue Mars as it can't remount without cable removal and re-insertion after an eject on desktop.
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