I've ran some experiments that may be useful. If, after pasting into the phone's folder in Nautilus, I close the nautilus window, the copy seems to work more often than not. I've tried this three times with success, once without, same data.
I've never had it work if I leave the Nautilus window open. I get an error after about 30 seconds or so "libmtp error: Could not send object.". This puts the MTP connection into the unusable state and it can't be re-mounted, even after unplugging the cable. It has never worked when leaving the window open, although it could be luck rather than something directly connected to the problem. Restarting the computer appears to have no effect. I've tried the a couple of times. Restarting the phone appears to recover from the fault instantly (giving the SD card a few seconds to mount up). I've tried this several times now. I also downgraded the backports and proposed packages, this appears to have had no effect at all. The results are not entirely consistent, but I hope this apparent pattern might lead to some useful speculation. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to libmtp in Ubuntu. https://bugs.launchpad.net/bugs/1468812 Title: HTC One M8 MTP fails while copying files Status in libmtp package in Ubuntu: New Bug description: Usually this device mounts with both internal and SD card storage appearing in an "Android Phone" folder in nautilus. Sometimes this does not work straight away. During copying several megabytes of images, with the phone screen on and unlocked, a message appears indicating an error copying. Most files are copied, even though the progress bar seems to stop at around 30%. All attempts to access the device in nautilus result in and empty set of results where the files normally appear. Removing then re-inserting the USB plug gives the message "Unable to mount Android Phone Unable to open MTP device '[usb:002,008]'" in a pop-up message. mtp-detect reports: Unable to open ~/.mtpz-data for reading, MTPZ disabled.libmtp version: 1.1.6 Listing raw device(s) Device 0 (VID=0bb4 and PID=0f25) is UNKNOWN. Please report this VID/PID and the device model to the libmtp development team Found 1 device(s): 0bb4:0f25 @ bus 2, dev 8 Attempting to connect device(s) ignoring libusb_claim_interface() = -6PTP_ERROR_IO: failed to open session, trying again after resetting USB interface LIBMTP libusb: Attempt to reset device LIBMTP PANIC: failed to open session on second attempt Unable to open raw device 0 OK. I have tried adding the following udev rule to resolve this: $ cat /etc/udev/rules.d/69-libmtp.rules # HTC One M8 ATTR{idVendor}=="0bb4", ATTR{idProduct}=="0f25", SYMLINK+="libmtp-%k", MODE="660", GROUP="audio", ENV{ID_MTP_DEVICE}="1", ENV{ID_MEDIA_PLAYER}="1" I've tried using a different USB port but this has no effect. Eventually, after removing and re-inserting the USB cable and being patient, it starts working again and it's possible to access the files again, but the problem re-occurs very quickly. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: libmtp-common 1.1.6-20-g1b9f164-1ubuntu2 ProcVersionSignature: Ubuntu 3.13.0-55.94-generic 3.13.11-ckt20 Uname: Linux 3.13.0-55-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.11 Architecture: amd64 CurrentDesktop: Unity Date: Thu Jun 25 16:52:57 2015 Dependencies: EcryptfsInUse: Yes InstallationDate: Installed on 2013-05-03 (783 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) PackageArchitecture: all SourcePackage: libmtp UpgradeStatus: Upgraded to trusty on 2014-05-21 (399 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libmtp/+bug/1468812/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
