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[Bug 1410506] Re: MTP looping between start and stopping causing constant ~10% cpu load

 

Note my PC is running utopic with the following mtp version

$ lsb_release -rd
Description:	Ubuntu 14.10
Release:	14.10

$ uname -a
Linux andy-Pangolin-Performance 3.19.0-031900rc4-generic #201501112135 SMP Sun Jan 11 21:36:48 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

$ apt-cache policy libmtp9 
libmtp9:
  Installed: 1.1.6-20-g1b9f164-1ubuntu5
  Candidate: 1.1.6-20-g1b9f164-1ubuntu5
  Version table:
 *** 1.1.6-20-g1b9f164-1ubuntu5 0
        500 http://gb.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages
        100 /var/lib/dpkg/status

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https://bugs.launchpad.net/bugs/1410506

Title:
  MTP looping between start and stopping causing constant ~10% cpu load

Status in mtp package in Ubuntu:
  New

Bug description:
  When unplugged from USB, I notice when running $ top that init, dbus-
  daemon, mpdecision are constantly using in total ~10% CPU.

  The steps I have performed to cause this:
  1) Ensure the device is off
  2) Plug a USB cable into the device and a computer with MTP support
  3) Boot the device
  4) Unlock the device, run the terminal and the command $ top
  5) Wait until the CPU settles, then unplug the USB cable
  6) Now notice that init, dbus-daemon, mpdecision start using ~10% CPU

  This is the output from running dbus-monitor [0]

  Note that when I plugged my device into a PC the CPU usage reduced
  back to normal, but then when I unplugged it again it increased back
  to ~10% again.

  0 - http://pastebin.ubuntu.com/9734788/

  $ system-image-cli -i
  current build number: 161
  device name: mako
  channel: ubuntu-touch/ubuntu-rtm/devel-proposed
  alias: ubuntu-touch/ubuntu-rtm/14.09-proposed
  last update: 2015-01-13 18:37:40
  version version: 161
  version ubuntu: 20150113
  version device: 20141119
  version custom: mako-1.1

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References