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From: Byte on 8 Jul 2010 11:04
Sleep will shut down power to USB ports if device is marked to conserve
power. When you SLEEP you may be depowering some USB device that is
interrupting the system trying to initialize after a full power up.

Guessing here, but .......

"Lorne" <lorne_anderson(a)hotmail.com> wrote in message
news:Okb#cbSHLHA.1052(a)TK2MSFTNGP02.phx.gbl...
> "Lorne" <lorne_anderson(a)hotmail.com> wrote in message
> news:##TfZMQHLHA.5920(a)TK2MSFTNGP05.phx.gbl...
>> "Lorne" <lorne_anderson(a)hotmail.com> wrote in message
>> news:eAFlOUPHLHA.4596(a)TK2MSFTNGP06.phx.gbl...
>>> I have Windows 7 home premium running on an AMD X6-1055 6 core
>>> processor. If I start Windows and leave it doing nothing except the
>>> background processes loaded at boot time the CPU runs continuously at
>>> 14/15%.
>>>
>>> When I inspect task manager it tells me system idle process is 99%, and
>>> none of the 80 running processes register above 0%, but at the bottom
>>> CPU use is still 14%+.
>>>
>>> When I look at the performance tab one processor (always the same one)
>>> is running at 85-90% and the others near zero.
>>>
>>> When I use a motherboard utility it shows the same thing - one processor
>>> at 85%+ and the others near zero.
>>>
>>> How do I find out what is running to cause this when task manager does
>>> not show the process? I have run Malwarebytes - it shows nothing
>>> unpleasant on the computer.
>>
>> I made some progress. I found windows system monitor and it shows me
>> that the cpu usage is caused by system interrupts. What I now need is to
>> work out which interrupt is causing the problem. any idea how to do
>> that?
>
> An interesting additional effect is that if I put the computer into sleep
> mode and wake it up the problem disappears - cpu down to 1 or 2% and use
> of cpu by interrupts under effectively zero.
>
> Does anybody have detailed knowledge of what sleep mode actually does
> that may change the behavior of interrupts?
>
>
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