ProBook 450 with high CPU usage

[fhgut]

I've manually downloaded the latest version from Update Catalog and installed it.

After some testing, the problem is back: high CPU usage and only Scan for hardware changes can help.

[FNodes]

Thank you, Gary-CH!

based on your explorations I tried a few different things and finally found a solution for the ACPI problem => the solutions works on 2 notebooks that were bugged by the system.exe / ACPI 12% (1 core) cpu load.

In the device manager I just disabled the PCI Express Root Port #12 => boom, cpu load instantly decreased and never appeared again (it's now working for about a week without the issue reappearing - on 2 previously bugged notebooks).

Probably now the card reader isn't working, but I actually don't need it ..

btw: before, I tried a million things, different driver version for nearly every susipicious device (like sound or fingerprint or intel management devices or graphivcs cards...) - even uninstalling drivers and deactivating didn't help... the issue mostly reappeared the next day.

But disabling PCI Express Root Port #12 now finally got me an acceptable solution - havn't had any negative side effects until now..

[JK80]

Until now, I don't have any troubles with 9.0.203.0. I even activated Fast Boot. Did you have installed the latest Bios and ME Firmware from the HP-Support Page?

Since now, the high CPU Usage did not came back, even after Sleep.

[FNodes]

For my part:

Last time I checked (maybe 2 weeks ago) everthing was on the newest versions, even BIOS and everyting.

With 9.0.203.0 you're probably referring to sound card drivers, right?

I even tried deactivating the whole sounddevice before, even that didn't help...  after what I've seen, I don't believe it depends on the sound card (but thats surely not guaranteed).

And: for me the problem is not a problem anymore (see my previous post) so now I stopped investigating things that HP should get solved - wasted way to much time on this issue...

PS: to be honest i'm currently on 9.0.180.10 (obviously I lastly checked _before_ May, 09) - with no problem (by deactivating "Mobile 6th/7th Generation Intel(R) Processor Family I/O PCI Express Root Port #12 - 9D1B"...

[JK80]

Yes, version 9.0.203.0 is referring to the sound card driver. And the driver of my Realtek PCIE Cardreader (which is located at the PCI Express Root Port #12) is "10.0.16299.21304".

The other versions I updated in the last few days was the Realtel USB Audio Driver to Version "6.3.9600.171" / sp87614, because I'm using the Elite USB-C Dock G3. And I updated the Intel Graphic Card Driver to Version "15.65.5018" / sp87556.

And I updated the Intel Management Engine Firmware to Version "11.8.50.3470". This Updates was dated to 17.05.2018, but disappeeared from the Support Pages. But after this update, I tested the Laptop, but the issue did not disappear.

Only after the update of the Sound Card Driver to 9.0.203.0 it disappear. Maybe it's the whole combination?

Update: And a few seconds after my reply, the problem start's again.  I don't know what it triggered. Fastboot and everthing else worked as expected. I think we have to wait for HP and Microsoft, because someone metioned, they are aware of the problem.

[Martin111]

Same problem here on ProBook 450 G5. Simulate problem is easy: just disconnect AC cable and system (ACPI.sys) start take 12% from CPU (1 full core, Intel i7). I have also latest Windows 10 x64 (build 1803), lastest updates and problem persist. It's happening only if notebook run on batteries. If you connect cable back - it doesn't fix problem. You must go to Sleep and wake up on AC then CPU problem disappear.

From posted solutions here on the forum - this one was working for me:  Disable device "Mobile 6th/7th Generation Intel(R) Processor Family I/O PCI Express Root Port #12 - 9D1B". I don't know what will stop working but we will see later.

[nathan1470]

Same model - same issue. Problem exists in Win10 1709 and the new 1803.

I'm using older HP models (e.g. Elitebook 840 G3) with 1803 and none of them show the same behaviour.

In total, wasted a couple of days trying to figure out what's wrong with the new HP device.

So far, the trick with "Scan for hardware changes" in Device Manager is the only task that - temporarely - solves my issue - at leats until the next power up from Sleep or Hibernation mode. - But frankly, this can't be the final solution.

What did NOT solve my problem:

1) Updating Intel drivers

2) Uninstall Intel RST

3) Uninstall Intel ME

4) Disable Conexant ISST Audio

5) Disable "Wake on LAN" in the Power Settings of the network cards

6) Disable "Turbo Mode" in BIOS - it resolved only the high CPU clock rate and therefore overheating of the system -> the fan does not need to run permanently now

7) ... some teaks I alreday forgot

[FNodes]

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can confirm everything nathan1470 wrote... I had tried everyting in that list (and several different power saving settings und even downgrading some drivers and whatnot)..

multiple times I thought the problem was gone, but it reappeared the next day or within minutes.

"Scan for hardware changes" is only a temporary fix, often the cpu-load reappeared within minutes - even a scheduled job that regularly "scanned  for hardware changes" every 15 minutes was not sufficient to keep the cpu load low..

But again: disabling PCI Express Root Port #12 permanently "solved" it (for over a week now - also on a colleagues notebook..)

[JK80]

Today Microsoft released a new Cumulative Update for WIndows 1803 which states:

Addresses an issue with power regression on systems with NVMe devices from certain vendors.

Maybe this resolves our issue. 

[ArtemSnezhny]

No, it doesn't