System and System Interrupts- high cpu utilization

2017 and I yet have the same issue!

A windows Process is using high CPU on my MacBook Pro

I have not much to add except that I have exactly the same problem: tried Yosemite public beta on my late 2013 MacBook Pro 13 inch (8GB RAM, 256GB SSD). Now I have done a clean install of Windows 8.1 with Boot Camp. Immediately after finishing the install I see System Interrupts in Task Manager consistently consuming a lot of CPU. Sysinternal's Process Explorer shows that the culprit is ACPI.sys.

I suspect that I had this problem before trying Yosemite as I often found the MacBook quite warm when running Windows 8.1 but did not think of investigating this then.

One more point: I reinstalled Windows 8.1 and confirmed that the problem starts immediately after the base OS install, not after installing Boot Camp.

(Deleted - double post.)

You can tempority fix by uninstalling any of intel graphic driver and use default generic display card driver by microsoft

Same thing is happening to me on my 2014 Macbook Air for Windows 7 Pro x64

25% of CPU is being used on idle due to System Interrupts.

I looked at the Event Viewer and there is an error every 3 minutes:

I uninstalled the Intel graphics drivers as mentioned above. The CPU idles low, but now I cant have max resolution, so this is not a fix. I currently have driver version 10.18.10.3907 installed for my Intel HD Graphics 5000, which was installed via Windows Update (after I uninstalled). I tried installing the latest drivers from the Intel website (10.18.10.3960), but fails.

Edit: After a few tries, I was able to install driver version 10.18.10.3960, but the CPU usage and error event is still present.

Same here. I first removed Intel's display driver installed with the Windows 8.1 installation and confirmed after rebooting that System and System Interrupts no longer are consuming a lot of CPU. Then I also tried the latest driver available from Intel which unfortunately brings back the problem.

Googling for 'Intel Iris 5100 Windows 8.1 High CPU' does not return any useful hits so this is probably a problem specific to the MacBook Pro. 😟

As I said before, this is a temp fix, it's only solve for longer battery usage

That's it

I found old drivers for HD 5000, but they all still have the 25% CPU usage on idle and event errors:

10.18.10.3960

10.18.10.3907

10.18.10.3496

10.18.10.3412

09.18.10.3165

Ill just use the stock Windows drivers, since battery life is important to me. We need a fix!

This problem also just started for me in boot camp with Windows 8.1 after upgrading my system from Mavericks to Yosemite.

I discovered a temporary workaround for this issue on another site - close the lid of your macbook/let it go to sleep once after booting into boot camp. When you wake the system back up, you should find that the System/System Interrupts are back to normal, sub 1% usage levels. I did NOT need to downgrade or uninstall my graphics drivers for this to work.

rMBP 13" Late 2013 2.6GHz 16GB Windows 8.1 Pro

Confirmed! I am back to the HD 5000 driver 10.18.10.3907. After a fresh boot into Windows 7, I put the computer to Sleep, woke it up, and CPU idle is now back to normal (0-5%). This also works for hibernation. Remember to set the power setting when you close the lid to hibernate or sleep.

Thanks, it works great! But we still need a fix.

I have the same issue..

Windows 8.1 showing System and System Interrupt taking up 25% CPU on idle.

Was not an isue until I updated the mac partition to 10.10.

Just did a clean install with the same issue, sleeping then waking the unit provides a temp fix...

May need to alert Apple engineering...

Hi, i have the exact same issue.

Both Macbook Pro 13´´ Retina (Late 2013 and Mid 2014) are at about 30% cpu usage constantly using Windows 8.1 via Bootcamp.

I wasnt able to figure it out whats causing that. Have tried everything i know to get it fixed under Windows. I recognized this issue after installing Yosemite, but i dont have any idea, if this was happing before the update.

Please fix it, the Battery life is quiet poor and the Macbook gets really warm while running constantly with 30% load, when it should be in idle.

Thx for a fast fix

Greetings from Germany

Jaws1200,

can you please post the side where you found the temporarily workaround?

Thanks alot!