System and System Interrupts- high cpu utilization

The site where I found this suggestion is here (had to dig through History on Mobile Safari on my iPhone to find it! ^_^):

https://social.technet.microsoft.com/Forums/en-US/939a0467-28e1-494c-b609-d1a81c 20886d/system-interrupts-making-w10-x86-unusable?forum=WinPreview2014Setup

(Scroll down to entries by: ShotSkydiver Starbucks Co.)

It would seem the issue does stem from something with the graphics sub-system, as this forum thread also describes (fixing the issue temporarily by "disabling transparency"):

https://airmail.tenderapp.com/help/discussions/airmail-beta-259/46-windowserver- 40-cpu-os-x-yosemite-becomes-sluggish

I also had an "Intel Corporation - Graphics Adapter WDDM1.1, Graphics Adapter WDDM1.2, Graphics Adapter WDDM1.3 - Intel(R) Iris(TM) Graphics 5100" Windows Update driver update install today, hoping this would fix the issue, but alas it didn't. However, I was at normal CPU usage before installing the driver (thanks to "Sleep" trick mentioned before), and then back at high CPU usage after the driver was installed (didn't make me reboot the system). Another Sleep cycle brought me back down to normal usage rates, but it would seem something with the Yosemite update (likely some update to the system EFI/BIOS [I know the retinas don't use "BIOS" but some people might not know what EFI is yet...]) likely mucked up something with the graphics in Windows boot-camp.

Anyone specific in Apple Engineering that this should be reported to?

Hi,

thx alot, im currently reinstalling Maverricks. I´ll report after I´ve finished the installation of Windows 8.1 via Bootcamp.

On the other Macbook Pro (still with Yosemite) the workaround just lasts for 10-15 min. After that period the 2 processes start causing high CPU usage (about 30%) again.

Greetings

Sorry to hear that, however I can report that the fix has worked over multi-hour sessions in Windows for me.

Hi,

installed Win 8.1 via Bootcamp once again using Mavericks.

Same thing :/

Any ideas how to fix this annoying issue?

You forgot that the EFI has been updated by Yosemite. I think this operation is irreversible.

Hi,

that was not the answer i was hoping to get 😀

I still think the MacbookPro is the best built Laptop on the market, but I need to get Windows running on that thing with a good battery life.

So who has to do the work now? Apple, Intel, Microsoft or someone else?

Greetings

Welp, chatted to Apple.

Was advised Apple will not assist with downgrading EFI, refused to acknowledge any issue I'm having, then referred myself to Microsoft.

A clean install of Windows 8.1 + The provided bootcamp drivers = the issue straight away.

How is this a Microsoft Issue. If it's not within OS X, they will not help.

Is the only option to wait for some updated Intel 5100 driver?

Might just be in the market for a Surface Pro 3 now....

Well then its just luck if we get a fix or not?

Thats not true, is it? Somebody has to fix it.

I can't believe that Apple or MS aren't still aware of this problem. Up to now three machines (two of my own and one of a friend) have this annoying issue running Windows 8.1 via Bootcamp.

If i´ve the time this evening, i´ll test it once again with a fresh and clean Windows 7 Installation.

If there´s no fix in the foreseeable future, i´ll have to switch back to a native Windows Notebook 😟

Hi there ,

i have the same issue , with Windows & Linux too ,

am willing to bet it's a Firmware issue that apple can solve with an update ,

the issue started after updating to OSX 10.10 ,

someone should inform apple

Hi,

and how can we inform Apple?

(I havent had the time yet to try Windows 7)

Greetings

there should be a technical support email or telephone number ,

am outside the us , so i don't know

Hi,

i´ll try to contact Apple tomorrow, hopefully they can help.

Anyone tried older bootcamp drivers yet?

i´ve found a site where you can find the software package in a whole.

Apple – Support – Downloads

Maybe this will help?

Or as anybody found a different fix?

Greetings

Hi;

For what it's worth, I'm seeing the same thing on the new Mac Mini (2.6Ghz standard configuration, Yosemite as standard) with Windows 7 Home Premium 64-bit. I'm given to understand that the Minis are essentially just MacBook Pros internally, anyway.

For me, it tends to clear up after a reboot, but comes back again after a wake from sleep (or intermittently).

(I'm also seeing a number of other issues - audio/networking not working when waking from sleep - but I assume these are unrelated).

I'll keep an eye on this thread and let you know if I find anything...

Hello,

Is this problem reported to Apple Support ?

Hi,

i´ve researched the Internet and what i´ve found doesn't make me happy...

It seems, that not only our Macs have this issue. The Surface 3 Pro seems to have this problem since July. No fix yet and its the end of October.

I also found a report with the same issue on a HP-Notebook.

http://answers.microsoft.com/en-us/surface/forum/surfpro3-surfusingpro/surface-p ro-3-high-cpu-load-when-idle-high-sysytem/d17d1332-3c00-402d-9f15-fecee27d1c45

http://www.borncity.com/blog/2014/08/06/windows-8-1-hohe-cpu-last-durch-systemun terbrechungen/

This evening i´ll contact Apple Support and ask for help. We will see....