1.1.8-1: jmtpfs fails with -6PTP_ERROR_IO

[Tom Roche]

[Apologies in advance if this is the wrong place to ask for jmtpfs support--if there is a more appropriate venue, please let me know.]

summary: When I connect my MotoG to my Debian laptop, the laptop detects the MotoG via both nautilus and jmtpfs -l. However my attempt to mount the MotoG with jmtpfs fails with -6PTP_ERROR_IO: failed to open session, trying again after resetting USB interface

details:

Per http://sourceforge.net/p/libmtp/feature-requests/126 I recently installed libmtp packages with version=1.1.8-1 on a Debian box, which now has

$ cat /etc/debian_version
jessie/sid
$ uname -rv
3.11-2-amd64 #1 SMP Debian 3.11.8-1 (2013-11-13)
$ gcc --version | head -n 1
gcc (Debian 4.8.2-1) 4.8.2
$ aptitude versions --disable-columns mtp | grep -e '^Package\|^i' | grep -vie 'dovecot\|mtpaint\|smtp'
Package gmtp:
Package gmtp:i386:
Package jmtpfs:
i  0.5-2  100
Package kio-mtp:
Package kio-mtp-dbg:
Package kio-mtp-dbg:i386:
Package kio-mtp:i386:
Package libmtp-common:
i  1.1.8-1  100
Package libmtp-dbg:
Package libmtp-dbg:i386:
Package libmtp-dev:
Package libmtp-dev:i386:
Package libmtp-doc:
i  1.1.8-1  100
Package libmtp-runtime:
i  1.1.8-1+b1  100
Package libmtp-runtime:i386:
Package libmtp9:
i  1.1.8-1+b1  100
Package libmtp9:i386:
i  1.01-3 testing 500
Package mtp-tools:
i  1.1.6-20-g1b9f164-1 testing 500
Package mtp-tools:i386:
Package python-pymtp:
Package uucp-lmtp:

Before connecting any MTP devices to the Debian box, I see

$ date ; jmtpfs -l
Sun Apr  5 20:08:46 EDT 2015
Unable to open ~/.mtpz-data for reading, MTPZ disabled.
Available devices (busLocation, devNum, productId, vendorId, product, vendor):

I then connected a (working) Moto G phone to the Debian box with a USB cable. A nautilus window opens showing the (browsable) contents of location='mtp://[usb:001,040]/' with device name='XT1028'. I can also see

$ date ; jmtpfs -l
Sun Apr  5 20:09:06 EDT 2015
Unable to open ~/.mtpz-data for reading, MTPZ disabled.
Device 0 (VID=22b8 and PID=2e82) is a Motorola Moto G (ID2).
Available devices (busLocation, devNum, productId, vendorId, product, vendor):
1, 41, 0x2e82, 0x22b8, Moto G (ID2), Motorola

However, I am unable to mount the device with

$ mkdir -p ~/Android_transfer/
$ sudo jmtpfs ~/Android_transfer/
Unable to open ~/.mtpz-data for reading, MTPZ disabled.
Device 0 (VID=22b8 and PID=2e82) is a Motorola Moto G (ID2).
ignoring libusb_claim_interface() = -6PTP_ERROR_IO: failed to open session, trying again after resetting USB interface
LIBMTP libusb: Attempt to reset device
Android device detected, assigning default bug flags
$ ls -al ~/Android_transfer/
ls: cannot access /home/me/Android_transfer/: Permission denied
$ sudo fusermount -u /home/me/Android_transfer

Should I use something other than jmtpfs to mount the device? If so, what do you advise?

If not, how to fix or further debug?

[Marcus Meissner]

is there another program acessing it, like gvfs? ps auxw|grep gvfs.*mtp

if yes, kill that other program