Comment 4 for bug 1392405

I verified this just now using gmtp instead of the default Ubuntu mtp tools. Gmtp can't see the device either, after it has been unplugged and idle for 15 minutes, and it doesn't get hung up on gvfs issues so it's usually much more reliable.

After a reboot, /usr/bin/mtp-server is normally running, but after being unplugged and idle for 15 minutes it wasn't running any more. I saw only the kernel's [f_mtp] process still going, which isn't sufficient to make mtp function.