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System (ACPI.sys) process taking lot of CPU

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Hi All,

I have installed Windows 8 Ent edition. All went good , but machine has been very slow from the time of installation. I have disabled and I saw that system process is taking lot of CPU. Why is system process using CPU continuously?

I have read other forums threads and it says it might be due to anti virus, or bad drivers. How can we figure which driver has problem?

I used process explorer and found that it is ACPI.sys which is taking CPU

Please let me know how to go about this issue.

Thanks & Regards

VV

Wednesday, April 10, 2013 6:20 AM

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Make a xperf trace to see the cause. Install the WPT (http://social.technet.microsoft.com/wiki/contents/articles/4847.install-the-windows-performance-toolkit-wpt-en-us.aspx), open a CMD prompt with admin rights and type this S(top ProcessExplorer first!):

xperf -on latency -stackwalk profile -buffersize 1024 -MaxFile 512 -FileMode Circular && timeout -1 && xperf -d highCPUUsage.etl

after you captured 30s of the cpu usage, go back to CMD prompt and press a key to stop the logging. Now compress the highCPUUsage.etl as 7z (LZMA2, ULTRA) to reduce the size. Upload this file to your SkyDrive or Dropbox and post a link here.
"A programmer is just a tool which converts caffeine into code"
Wednesday, April 10, 2013 5:45 PM

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hello i think i got same problem like Vic Vega

Now uploading the etl file

hope someone can help, i can play any game smoothly because of this

update :

here is the link : dropbox.com/s/hua3gd9wsuh5lnq/highCPUUsage.7z

and the dxdiag : dropbox.com/s/swml337fian7bzz/DxDiag.txt

please help
- Edited by wafflepancake Tuesday, April 16, 2013 5:23 AM
Tuesday, April 16, 2013 4:39 AM
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the trace is incomplete. Don't rename the kernel.etl. the xperf -d is important.
"A programmer is just a tool which converts caffeine into code"

Tuesday, April 16, 2013 5:31 AM

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how long to complete?
you said 30s

but okay i'll make the etl again

thx for reply
here is the new ETL : dropbox.com/s/p7j61dr9enyys46/kernel.7z
- Edited by wafflepancake Tuesday, April 16, 2013 7:47 AM
Tuesday, April 16, 2013 6:22 AM
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you did again the opposite from what I told you. DON'T upload the Kernel.etl. This file is useless on other PCs!

"A programmer is just a tool which converts caffeine into code"

Tuesday, April 16, 2013 9:02 AM

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wew..sorry man but I type exactly like you told

the output is kernel.etl

i dont know what's wrong

i'll be looking for what's wrong

thank you for your reply

Tuesday, April 16, 2013 9:23 AM
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no, the kernel.etl is only a temporary file in your root drive.

Run explorer, go to C: make a new folder xperf, go into this folder. Under File->Open cmd select to open a CMD prompt with admin rights.

Now run the command, wait at least 30s (this is required to capture enough data) go back to the CMD window and press a key. Now you see a file called highCPUUsage.etl. I need this file, no kernel.etl.
"A programmer is just a tool which converts caffeine into code"

Tuesday, April 16, 2013 10:33 AM

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OMG..I've been so stupid, the right file is in system32 folder lol

I hope this is the ETL file u need, need 1 hour to upload 50mb with my connection.

dropbox.com/s/hua3gd9wsuh5lnq/highCPUUsage.7z

thank you so much after all

Tuesday, April 16, 2013 12:16 PM
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ok, the CPU is getting to hot and Windows tries to throttle the CPU.

http://en.wikipedia.org/wiki/CPU_throttling

This throttling shows up as ACPI.sys usage (regular usage by SYSTEM and DPC usage).

Update the BIOS/Firmware and try tools like Speedfan to increase the CPU cooler fan speed to cool the CPU more.

"A programmer is just a tool which converts caffeine into code"

Tuesday, April 16, 2013 6:20 PM

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Whew.. I never think that before, because I "hear" the fan works ok so I though that's not the problem

My Bios the latest one from Asus, is it ok to increase the fan?

And should I send it to the service center?

Thanks you so much man.

Wednesday, April 17, 2013 3:11 AM
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Use Software tools like Speedfan and increase the CPU fan speed. Does this improve it?
"A programmer is just a tool which converts caffeine into code"

Wednesday, April 17, 2013 5:06 AM

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I think increase the speedfan can't solve it

Now I try to downgrade the BIOS version, because I tried back to W7 before and nothings changed

If bios don't work, I just give up and send it to the service center

Is there any more advice?

Wednesday, April 17, 2013 6:12 AM
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Mine is also latest BIOS version. I see ACPI.sys is taking CPU in process explorer. Why it happens in Windows 8 and never in windows 7?

Wednesday, April 17, 2013 6:26 AM
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I see ACPI.sys is taking CPU in process explorer. Why it happens in Windows 8 and never in windows 7?

give me the xperf trace and I can tell you more.
"A programmer is just a tool which converts caffeine into code"

Wednesday, April 17, 2013 5:53 PM

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Not only in 8 it also appears in 7

That's my case

@Andre.Ziegler

Thank you man for your reply and help, I downgraded my BIOS and still can't solve it. Now my notebook is dead >.<

I will RMA it today

Thursday, April 18, 2013 3:50 AM
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I have System process running at 40% CPU all the time.
I see that ACPI is the cause.

The only way to stop the CPU activity is to put the computer to Sleep and after the resume the CPU is down to 0%.

Here is my trace as requested.

https://s3-us-west-1.amazonaws.com/meshare/highCPUUsage.etl

Thanks!

Monday, June 1, 2015 11:35 PM