Source of High CPU Usage @idle System Interrupts

gang I have G4-1117dx, llano-based notebook from HP, which I outfitted with mem and a crucial ssd, fresh install .
the system gives no interesting errors via the error log and performs ok, except that the CPU is constantly cranking at ~30-40% even sitting idle. Process Explorer and/or Task manager show system Interrupts high, but drilling into the stack of stuff I can't find the culprit.

I've disabled all the USB onboard stuff via device Manager - no luck.
disabled and uninstalled network devices - no change.
disabled Defender - no effect.
uninstalled/reinstalled the AMD stack - no change.
Uninstalled all Synaptics software - no change except my touchpad is jumpy now
I tried to uninstall the SATA device - it uninstalled, but the same driver was back on the next boot so I'm not so sure what's up there. this system unfortunately has no setup controls on SATA. looking into Properties via Dev. Manager, there are no Advanced settings - I cannot force it to DMI-o.nly.

looking at the I/O columns I don't see anything unusual, but I'm a novice with Process Explorer

stumped. all I read says its certainly an ill-configured device, but I can't find the bugger

help!

 

Try uninstalling your WLAN adapter drivers and allow Windows update to do it automatically (if possible).

 

already tried, no effect.
and the NIC; no effect.

 

How recent is that fresh install of Windows and do you have the .net framework packages installed. On brand new and sparkling install of Windows with .net. You'll have some binaries that will be compiled in the background at idle and Windows will also be indexing stuff at first. I remember freaking out a couple of years back because my CPU usage was spiking and it was just background stuff that needed time to complete and it never bothered me again afterwards.

If it's been persisting after an hour or two of idling, then it's definitely something else and sorry I was of no help.

One thing you could do, is boot in safe mode and see if the behavior is still there. Then disable everything at startup, start re-enabling them one by one and see if you can pinpoint the source of the problem.

 

I had an issue with the Logitech software package using up CPU resources for no reason, had to deinstall it.

 

it was the SATA drivers from AMD. buggy.
I should have known that, and someone else suggested, but my memory was backwards.
in this case, the MS AHCI driver is WAY better.

I'm using Windows 10, and in the Device Manager, the defaulted "AMD SATA Device" settings had no settings,, to speak of - the whole 'advanced properties' tab was absent - that should have been a clue. couldn't find a way to gracefully switch, but finally figured it out.

my 'idle' CPU utilization dropped from MID-30's to 1%.
like a different system now