Windows 10: High CPU usage by ACPI.sys ("system" process)

Hello,


So here is my problem : in the task manager, the "system" process sometimes takes ~30% CPU (when it should take between 1 and 6% at most). This happens every time I start my computer after completly shutting it down. Putting it to sleep and wake it temporarily solves the problem, but it happens again at the next start, or it can also come back at random which is really problematic when i'm doing other CPU-hungry activities.





My config :

I have a HP OMEN 17-an029nf laptop:

1To HDD (no SSD)

Intel Core i5-7300HQ

GTX 1060 - 6 Go

8 Gb RAM


I saw many subject about similar issues, so I already tried some things :


First, i investigated what makes the system process take so much CPU with the Windows process explorer, here are the results :




I also saw a topic where people ran Windows Performance Recorder, so I did too to see if we had the same issue (we hadn't) :



(on a 30sec recording)


I already tried to disable fast boot, to disable every non-essential driver one by one (maybe I forgot one, but at least I tried most of them).

I already scanned my computer for threats.

I just completly reinstalled Windows and the issue still persists.

All drivers are obviously up to date, as well as Windows and BIOS.



Any help appreciated ! Thank you in advance.

:)

 

"System" process with high CPU usage

I have exactly the same issue (high CPU usage) on a brand new HP ProBook 440 G5 (i7-8550U, pre-installed Win 10 Pro).

I am pretty sure that there is a problem with audio drivers when the computer wakes up from a sleep mode. I first observed that process flow.exe (audio bloatware provided by HP/Conexant) was consuming (after waking up) ~10–15 % CPU. Here's what I did:

• I have updated Windows to 1709, build 16229.251 and installed all updates --> Nothing has changed.
  
• I have updated BIOS to the latest version provided by HP. --> Nothing has changed.
• I have run Windows troubleshooting and HP Support Assistant checks --> No problems found, nothing has changed
• I have manually updated Conexant ISST Audio Drivers (via Device Manager -> Update drivers). Windows installed a newer version. -->
  CPU usage by flow.exe has disappeared, but process called System in thread ACPI.sys+0x21cb0 started consuming ~20 % CPU.
• I have uninstalled all Conexant software&drivers and manually installed generic High Definition Audio Device drivers provided by Microsoft (Driver Date: 21.02.2018). --> ACPI.sys+0x21cb0 still consumes ~20 % CPU.

Same issues are discussed in these threads on HP site:

• https://h30434.www3.hp.com/t5/Business-Notebooks/ProBook-450-with-high-CPU-usage/td-p/6520063
  
• https://h30434.www3.hp.com/t5/Noteb...-Fan-issue/m-p/6567212/highlight/true#M442639

The result is I cannot use sleep mode (as advised by this post:
https://h30434.www3.hp.com/t5/Business-Notebooks/ProBook-450-with-high-CPU-usage/m-p/6611446/highlight/true#M149605).

 

System and compressed memory background process persistently consuming high CPU resources

Hi,

Thank you for posting in Microsoft Community.

Please answer these questions to get more clarity on this issue:

1. Did you make any changes to your computer prior to this issue?

2. Which anti-virus program is installed on the PC?

High CPU usage occurs for various reasons, for example: virus/malware infections, out-of-date drivers, anti-virus programs or other third-party programs, etc;

Method 1: Windows has a built-in troubleshooter to check and fix issues with system. I would suggest you to run this troubleshooter to check if the issue is with your System
Maintenance.

Refer these steps:

• Press Windows key +X, select Control panel

• Change the view by option on the top right to Large icons
• Click on troubleshooting and click on the view all option on the left panel

• Run the System Maintenance troubleshooter

Method 2: Check if the issue resolves in
Safe Mode.

Refer this article to boot to safe mode:

http://windows.microsoft.com/en-us/windows-10/change-startup-settings-in-windows-10#v1h=tab01

Steps to reduce the CPU usage.

1-Press "Ctrl," "Shift," and "Esc" on your keyboard. This brings up the task manager without any intermediary screen.

2-Click the "Processes" button on the task manager.

3-Click the "CPU" column header until the arrow next to the label points down.

4-Right-click a program you recognize that uses a high percentage of the CPU and click "End Process." Click "End Process" to reconfirm. This eases up on the CPU's load. Use this step if you're not using a process or if the process has stopped responding. Do
not use this procedure for windows processes.

Hope this helps. If the issue remains unresolved, please get back to us and we would be happy to help.

Thanks.

 

'System' process high CPU usage


Hello,

Since the past 3-4 days the process called 'System' has been constantly using approximately 35% of my CPU. The usage is pretty much constant all the time. Below you can find screenshots from task manager, resource monitor and process explorer.
In the past I've never seen this, leaving the PC idle dropped the usage down to almost zero, now the CPU is running at full clock 24/7, heating it up ~55C, which is mildly undesirable.

Attempts done so far to fix the issue, none has worked:
- Waiting. I leave the PC to run overnight, but it does not seem to help it.
- Restarting, done multiple times, no effect whatsoever.
- sfc /scannow, nothing found.
- Full virus scan, nothing found.
- The update settings has been set already to not to receive from other pc's. All updates are installed what windows update has to offer.

PC specs:
Acer VN7 laptop, running Win 10 Home 64bit. HW: i5-6300HQ, 16GB, GTX960M. All drivers up to date.