Hello.I had this problem, I fixed it running folding@home with nice 19 instead of SCHED_IDLE, the same should be possible for BOINC or other programs that stress the system.
Maybe this is related (or the same) to bug #517449. Hope this helps. Thanks. -- Ivan Baldo - ibaldo@adinet.com.uy - http://ibaldo.codigolibre.net/
From Montevideo, Uruguay, at the south of South America.
Freelance programmer and GNU/Linux system administrator, hire me! Alternatives: ibaldo@codigolibre.net - http://go.to/ibaldo