System and System Interrupts- high cpu utilization

We use Windows for "normal working", not OS X. While working in Visual Studio typical CPU load on all "not Apple" computers is about 1-2%. On our Macbooks BEFORE EFI update it was the same, 1-2%, battery lasts 7-8 hours. But AFTER EFI update one CPU core loaded 100% all the time, so on our MBP15 late 2014 with 8 virtual cores total CPU load is about 12%, battery lasts about 2 hours, MBP became very noisy and hot. EFI security upgrades are good things, but side effects like this are inacceptable.

Have you looked at Control Panel -> Power Options -> your power plan -> Advanced Settings -> Processor Power Management settings to try and tune the Maximum and Minimum. I would also suggest testing W10 on these. Is your Windows installation EFI/UEFI or BIOS?

Processor Power Management has nothing common with system interrupts. THE SAME issue is with Linux. Both Windows/Linux installed with EFI/UEFI. But in Linux it is possible to block this system interrupts (this is not a solution, just papertape quick fix, we see this interrupts go from Intel Iris Graphics). And both Windows/Linux have no issue with old EFI firmware. I have not tested Windows 10, but I 99.9% sure it also have this issue with new EFI firmware and don't have issue with old firmware.

On a 2012 13-in MBP with Intel HD4K W8.1 64-bit, I do not see this behavior at all. EFI and BIOS on dual-GPU installations behave differently exposing one or both GPUs. The other challenge with Intel GPUs is that they share VRAM with main memory so any cache coherency for such shared RAM propagates both ways causing CPU context switches and generates interrupts. Are these IO interrupts or something else?

This issue exists only on MBP15 late 2014 as I remember (we use only MBPs without NVidia graphics because Apple didn't prowide graphic switching support under Windows/Linux). The same issue was on MBP13 late 2014 after 10.10.2 EFI upgrade, but they say it was fixed by latest EFI upgrade in 10.10.3.

It's quiet here. Looks like most of users has solved their problems. Recently i've got a eGPU setup and the problem is that nVidia eGPU disabled the 'sleep' mode in Windows. Now i have no workaround at all! Please help! 😝

I've tried the latest Intel drivers. I've upgraded MacOS to the latest 10.10.5 version. Still nothing.

It's not solved from where I'm sitting. I still sit hit anxiously waiting for a fix on my late 2014 MBP running bootcamp Windows 8.1. Drives me nuts!

Is your installation an EFI or a BIOS installation?

Problem still persist and many other than Macbook users have exactly the same problems for years on other brands of laptops also. Seems you here are the ones on the whole internet that is closest to nailing the core of the problem by the looks of it...

I am on a early 2015 Macbook Pro 15" with only Intel Iris (except when running eGPU) running Windows 10 on an external USB drive EFI boot (because win7 would not work). Closing the lid and hibernating does not help, it just hides the all the processes running in kernel mode so it look like the problem is solved. My CPU is still at 85-90 Celsius at "idle" (no processes showing in task manager using CPU) while real idle in Yosemite is 30 Celsius.

This is most likely the last Mac I will buy... Apple have really gone downhill like sabotaging so when you use any other monitor than an Apple Cinema display you get horrible aliasing problems and colors that is totally wrong, and now this on top of it with no solution for over a year...

The same problem with 80-100% usage of one CPU core also persist in difrent Linux versions with those who have this problem in windows on all kinds of brands of laptops, not just Apple. This sounds more and more like a hardware problem with Intel graphics or CPU and not software, but no one will take responsibilty for it... Intel just say it is Apples problem and totally ignores that it is not just Mac hardware that have this exact problem. It seems Mac OS is the only one that don`t have this problem among those affected in linux and windows with one core running wild with 100% CPU usage 24/7...

Latest version, aka El Capitan, on Windows 10 still doesn't fix this issue.

So...

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(There's only a tiny CPU bug, but you don't have to worry because Apple would never let you without a fix.)

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I did a clean reinstall of Windows 10. All was ok no "system interupts" using 100% of CPU 0 when I logged on Windows 10. But as soon as I installed the drivers using Bootcamp tool in windows 100% CPU usage of CPU 0 was back... If i start Windows in safe mode all is ok and I have tried uninstalling all drivers down to even loosing my keyboard without anything helping. Uninstalling the Intel graphics drivers does not help as they reinstall themselves...

I have found out that on my early 2015 Macbook Pro 15" with Intel Iris graphics only that if I disable Intel Iris graphics in device manager the 100% CPU usage on CPU-0 (with system interrupts) stops. I have tried disabling everything else including USB so I lost mouse and keyboard and that is the only thing that worked.

After I installed an eGPU using Thunderbolt connection my windows 10 install simply refuses to hibernate so the hibernate to stop 100% CPU usage on one core don`t work anymore.

still no solution... Apple sends me to Intel and Microsoft and Microsoft and Intel to Apple. This is hopeless!