Win 8.1: Device becomes un-responsive during MTP transfer of multiple files

[Richard Huddie]

ENVIRONMENT:
krillin ubuntu-rtm/14.09-proposed build 13.
mtp-server 0.0.4+14.10.20140827-0ubuntu1
Windows 8.1

SUMMARY:

During MTP transfer of multiple files, the Ubuntu device becomes unresponsive and the transfer stops responding. Eventually Windows presents a message "The device either stopped responding or has been disconnected".

STEPS:
1) Connect Ubuntu device to Windows 8.1 over USB
2) Copy multiple audio files from Windows to Ubuntu device (however same problem can also been seen with pictures)

EXPECTED RESULT:
1) Ubuntu device is recognised as MTP device
2) All files are copied to Ubuntu device successfully

ACTUAL RESULT:
After approx 500MB, the transfer becomes unresponsive. Windows eventually presents a message "The device either stopped responding or has been disconnected".

[Mathieu Trudel-Lapierre (cyphermox)]

I'm seeing something like this; but only with very specific files: in the case of my test, it's one very large (2.4+GB) file.

Could you please re-test this, and see if it always happens with the same filenames, or with files that have specific attributes?

Thanks.

[Richard Huddie (rhuddie)]

This problem seems to occur more with directory structures. I copied a large series of files in the same directory and it worked ok. But when the files are spread across a directory structure, the problem seems to occur more quickly.

The music files I am copying have a directory structure: artisit/album/tracks.

I will also do some more testing around the filenames/attributes to see if there is anything that triggers it.

[Mathieu Trudel-Lapierre (cyphermox)]

I re-transfered files (about 2Gb worth of data in multiple files) on Windows 8 and it seems to work properly, I will re-test with one very large file again, just to be safe.

[Richard Huddie (rhuddie)]

I have re-tested this again, but I still see the same issue. I'm attaching some test data image files which reproduces the problem quite easily (for me at least!). These I am copying into the Pictures folder and after only a few seconds the device becomes unresponsive. Then after a couple of minutes there is the same error from Windows saying the device is disconnected.

[Richard Huddie (rhuddie)]

re-testing on krillin rtm image 30 was much better and I didn't see this issue