Massive number of unexplained wakeups on Thinkpad X60s

[Arjan van de Ven]

John Fremlin wrote:
>>> So
>>> cur_usage[2]=1. Then there is a wake-up and it goes back to C0. Your
>>> calculation will say there were two wake-ups.
>> because there were two...
> 
> So what were they!? They are not explained by adding up the known
> wake-up causes!

for one, we know that DMA traffic can/will wake the cpu out of C3... 
and there is no way to really find DMA traffic.

I'll see if we can get a counter added to the kernel for this...