Since I installed Kubuntu 11.10, I've noticed amule "goes to sleep" after the computer is left idle for 20 minutes.
Upon returning to the computer, the amule window takes some time to respond to mouse clicks and the "Statistics" pane clearly shows it has been doing nothing but sleeping.
This didn't happen in Kubuntu 11.04 and other long running applications (like JDownloader) and services (SSH) don't show this behavior in 11.10.
I also tried leaving amule maximized, minimized and minimized to the systray with no difference at all (I don't think it has anything to do with the window manager).
The screensaver is activated after 5 minutes of inactivity and the screen is put to sleep after 10 (it doesn't seem to be power-saving related either).
To see what's going on, I've opened an SSH console and run 'top' as well as this little script:
Exactly after 20 minutes, CPU usage goes to 0 in 'top' and the script shows no increment in 'cputime'.
c=0; while true; do echo $c `ps -C amule -o %cpu,cputime`; sleep 10; let c=c+10; done
Does anyone know what's going on here? Has this happened to anyone else?