In kubuntu 12.40, Linux 3.2.0-34-generic (and older in 3.2.0-x builds), kde 4.9.4 and older (as I can remember all 4.9.x have this issue)

1). I can't copy file to device using Dolphin (kio_obexftp?) mater again I can't copy anything 
2). dmesg 
[97710.792010] Bluetooth: hci0 command tx timeout
3). evently the same event stored into syslog 

but further 
4). I can easily browse the device using Dolphin and may even create new folders
5). I can send files to device using bluedevil-sendfile or KDE Send Files dialog.
6). I can send files to device using console obexftp tool. The Bluez probablu working as expected

so the problem more likely somewhere into kio_obexftp or into bluedevil...



Reproducible: Always

Steps to Reproduce:
1. Using Dolphin file manager start browsing device and navigate do any folder on the device's file system you have permissions  write into.
2. Drag any local file and drop it on the folder you opened at step 1.


Actual Results:  
nothing happens, even more after same time you'll loose ability to browse the folder or even device fs

Expected Results:  
1. The job progress indicator should became visible on the system tray
2. the file should be copied to device's folder and visible there via device interface or via KDE's browse device feature

As for me this bug appeared at KDE 4.9.x  the Kubuntu 11.10 with KDE 4.8.x worked just fine

see also discussion here
https://forum.kde.org/viewtopic.php?f=18&t=107671&p=255126


List of installed packages related to bluetooth system
ii  bluedevil                                                   1.2.2-0ubuntu1                               KDE Bluetooth stack
ii  bluez                                                       4.98-2ubuntu7                                Bluetooth tools and daemons
ii  bluez-alsa                                                  4.98-2ubuntu7                                Bluetooth ALSA support
ii  bluez-alsa:i386                                             4.98-2ubuntu7                                Bluetooth ALSA support
ii  bluez-cups                                                  4.98-2ubuntu7                                Bluetooth printer driver for CUPS                  
ii  libbluedevil1                                               1.9.1-0ubuntu1                               A Qt wrapper for bluez
ii  libbluetooth3                                               4.98-2ubuntu7                                Library to use the BlueZ Linux Bluetooth stack     
ii  pulseaudio-module-bluetooth                                 1:1.1-0ubuntu15.1                            Bluetooth module for PulseAudio sound server       
ii  libmulticobex1                                              0.23-1build3                                 multi-protocol cable OBEX library                  
ii  libobexftp0                                                 0.23-1build3                                 object exchange file transfer library              
ii  libopenobex1                                                1.5-2build1                                  OBEX protocol library                              
ii  obex-data-server                                            0.4.6-0ubuntu1                               D-Bus service for OBEX client and server side functionality                                                                        
ii  obexd-client                                                0.44-0ubuntu1                                D-Bus OBEX client
ii  obexfs                                                      0.11-1                                       mount filesystem of ObexFTP capable devices
ii  obexftp                                                     0.23-1build3                                 file transfer utility for devices that use the OBEX protocol
ii  obextool                                                    0.35-0ubuntu2