It happens without any apparent cause to me too, even with the system is idle.
It just appears that under normal operation, it happens 2-4 times a day (completely random, no fixed interval between events); but if I start playing Portal, for example, it happens in less than 30 mins (again, at random, no defined interval).
Switching terminals also takes 10-15 seconds for me, and htop from the console also shows the same unresponsiveness. Shaking the mouse vigorously or flood-pinging from another machine alleviates the problem until it goes away (it makes sense: they produce interrupts that wake the process scheduler; this also explains the high system CPU usage: the scheduler never awakes for normal ticks since there is no timer, but it awakes to process hardware interrupts).
It happens without any apparent cause to me too, even with the system is idle.
It just appears that under normal operation, it happens 2-4 times a day (completely random, no fixed interval between events); but if I start playing Portal, for example, it happens in less than 30 mins (again, at random, no defined interval).
Switching terminals also takes 10-15 seconds for me, and htop from the console also shows the same unresponsiveness. Shaking the mouse vigorously or flood-pinging from another machine alleviates the problem until it goes away (it makes sense: they produce interrupts that wake the process scheduler; this also explains the high system CPU usage: the scheduler never awakes for normal ticks since there is no timer, but it awakes to process hardware interrupts).