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drkadrkadjon
Paper Tape
Posts: 3
Registered: ‎09-25-2013
Location: vancouver
Views: 4,544
Message 1 of 5

T430s ntoskrnl.exe high CPU usage when idle on Windows 8 Pro 64 bit

This issues has been plaguing me for months and I couldn't sort it out. When laptop is idle (after 5 to 10 mins), the CPU usage spikes to a steady 25% and stays there for ever until some interrupt is genereated (ie i start using laptop again). fans go crazy and tho whole experience is quite annoying.

 

I read some posts that wlan drivers could cause such scenarios. After a reboot the issue disappears sometimes for a day, however it comes back again as a taxman does.  I also checked device drivers in the control panel and there is no  single faulty driver. At the moment I disabled wlan and I'm using cable in a hope to isolating the problem in case it is due to the wlan driver as many said (Intel Centrino R Ultimate-N 6300 AGN).

 

I used process explorer by Sysinternals and tracked the issue down to a kernel/device driver function with an exotic name ExEnterCriticalRegionAndAcquireResourceExclusive. Too bad we in the linux world don't have such functions with extraordinarily amusing names.

 

I've attached the Process explorer snapshot. Any help is highly appreciated!

 

criticalregion.png

drkadrkadjon
Paper Tape
Posts: 3
Registered: ‎09-25-2013
Location: vancouver
Views: 4,509
Message 2 of 5

Re: T430s ntoskrnl.exe high CPU usage when idle on Windows 8 Pro 64 bit

I've just noticed that Intel COM4 appeared as a faulty driver in the device manager. I tried to update it however Windows thinks that is up to date. I also tried to remove it but it came back.

 

Does anyone know how to solve this issue?

 

amt.png

ltctech
Punch Card
Posts: 27
Registered: ‎01-25-2009
Location: Seattle, WA
Views: 4,492
Message 3 of 5

Re: T430s ntoskrnl.exe high CPU usage when idle on Windows 8 Pro 64 bit

Is this driver installed:

http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS032434

 

Even if it is, maybe try reinstalling it...

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 4,483
Message 4 of 5

Re: T430s ntoskrnl.exe high CPU usage when idle on Windows 8 Pro 64 bit

If you don't use AMT, uninstall it.

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
drkadrkadjon
Paper Tape
Posts: 3
Registered: ‎09-25-2013
Location: vancouver
Views: 4,476
Message 5 of 5

Re: T430s ntoskrnl.exe high CPU usage when idle on Windows 8 Pro 64 bit

Now the issue appeared when the laptop went from sleep to normal operational mode. I had to reboot in order to bring the CPU usage down. The same driver function caused the loop.

 

I first tried installing the driver as suggested, however device manager showed faulty driver again.

 

How do you uninstall the feature. From device manager? Tried that but somehow windows recognizes the h/w changes and brings it back as shown on the 2nd picture.

 

Thanks for the suggestions.

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