I've notice many people reporting this problem and I'm suffering from it too on Ubuntu 12.04. I'm using GVFS for android support, but I rarely connect to any GVFS devices yet this problem appears all the time.
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 32100 ea 20 0 38700 2872 2412 S 102 0.1 25:57.01 gvfs-afc-volume 6775 ea 20 0 2848 1172 880 R 6 0.1 0:00.05 top 1 root 20 0 3748 1992 1292 S 0 0.1 0:06.86 init (rest are idle)
I kill the process and everything is fine, but it seems to happen about once or twice an hour. I haven't seen anything in particular that triggers it. Often I'm just programming with no audio apps running (audio is muted too) or USB activity.
I saw this bug report https://bugzilla.redhat.com/show_bug.cgi?id=679988 but nothing is happening there.
I could install cpulimit, but I want to try to fix the issue. Does anyone know what to do? Is there any way to disable this process and what would it harm?