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[Bug 1314556] Re: Unable to mount Android MTP device


Tested with mainline kernels


On the most recent kernel v4.2-rc8-unstable problem persists (lsusb hangs, MTP/ADB do NOT work)

On kernel v3.17.8-vivid no problem (lsusb is instant, MTP/ADB DO WORK)

On kernel v3.18-rc1-utopic the problem appers for the 1st time (lsusb hangs, MTP/ADB do NOT work)

to install, download deb and run
sudo dpkg -i linux-image-3.17.8-031708-generic_3.17.8-031708.201501081837_amd64.deb
the new kernel item will go to grub menu

So, the regression was added to the kernel during v3.17.8-vivid ->
v3.18-rc1-utopi transition. Someone who is competent could try to make a
diff or something.

Aslo, as a side note, it seems that on 3.16/3.17 kernels 2 other annoying problems from the default Ubuntu 14.04 installation with kernel 3.19 are gone:
- mouse cursor did disappear for some time almost after desktop load, then appeared with no visible reason
- keyboard switcher could stop working at some random moment for some time and randomly returned back to life

This may have the same source in hanging usb subsystem which may block
mouse/keyboard calls in some way for some time and then return.

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  Unable to mount Android MTP device

Status in gvfs package in Ubuntu:

Bug description:
  I have the same problem on 3 computers with 14.04:

  So I tried,
  Unable to open ~/.mtpz-data for reading, MTPZ disabled.libmtp version: 1.1.6

  Listing raw device(s)
  Device 0 (VID=04e8 and PID=6860) is a Samsung Galaxy models (MTP).
     Found 1 device(s):
     Samsung: Galaxy models (MTP) (04e8:6860) @ bus 1, dev 10
  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
  inep: usb_get_endpoint_status(): Resource temporarily unavailable
  outep: usb_get_endpoint_status(): Device or resource busy
  ignoring libusb_claim_interface() = -6LIBMTP PANIC: failed to open session on second attempt
  Unable to open raw device 0

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: gvfs-backends 1.20.1-1ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Apr 30 11:18:12 2014
  EcryptfsInUse: Yes
  ExecutablePath: /usr/lib/gvfs/gvfs-mtp-volume-monitor
  InstallationDate: Installed on 2013-02-12 (441 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
   PATH=(custom, user)
  SourcePackage: gvfs
  UpgradeStatus: Upgraded to trusty on 2014-04-02 (27 days ago)

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