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ACPI.sys Maxing out one CPU Core on ASUS motherboards possible solution - explanation please?!

Hey! I felt I needed to make a new thread for this, since this is crazy and I really need some explanations here.

 

I'm running an ASUS ROG Strix B460-F motherboard (brand new PC build) and I've had the problem with high CPU idle usage, slightly too high temperatures and one core using 100% of its' power ALWAYS.

I've been trying to fix this for a week without sleeping much and I've basically tried EVERYTHING. People have been telling me my CPU is fine and the idle usage of 10% is ok, but I kept thinking that my old budget rig was using less CPU whilst idling and realized something has to been wrong.

 

Now, just before giving up today I did the following (and I could really need some explanation here)

 

1. I went into ASUS UEFI and turned on Discrete Thunderbolt Support (or something like that) under Platform Misc. under Advanced settings. I have NO idea what this does, but I guess it activates some sort of TB support.

2. Suddenly the process usage was down to 0-1%, and my cores weren't working AND my temps were lower. SUCCESS! 

BOOM, after restart the problem was back.

3. I navigated to Device Manager and refreshed device changes -> Boom the problem went away... but only for 2 seconds before coming back again.

4. I started deactivating PCI Express Roots in Device Manager (under System devices), one by one until suddenly, the CPU went silent and my problem was solved.

 

here.png.cf24bec5ef2201c023d82ea8238c7db3.png

 

I thought the thunderbolt thing in BIOS didn't matter anymore and went ahead and turned it off again. BOOM - problem back, and the device disappeared from device manager. So obviously this device activates by turning on thunderbolt in BIOS.

I repeated the process again, and it now works. I have restarted once since and CPU usage and temps are now stable and low.

I hope it stays this way.

 

My questions are:

1. What the HELL have I done? And WHY does turning on a device in BIOS and then deactivating it in Windows reduces latency and usage of ACPI.sys in the process tree "System"?

2. Does this affect my system at all? And is there an easier way to do this? And can I uninstall the device completely?

3. How do I prevent this issue from coming back?

 

What this fixed for me:

CPU idle usage from 10% to 1%

My idle CPU temperatures went from 48C to 32C.

Intel SpeedStep and TurboBoost started working properly (how is this even related)

 

 

 

For reference, here are some ppl with the same problem:

https://superuser.com/questions/1126452/acpi-sys-system-process-maxes-out-one-cpu-core-on-windows-10

https://superuser.com/questions/577008/system-acpi-sys-is-always-using-about-15-20-of-my-cpu

https://rog.asus.com/forum/showthread.php?100600-Single-core-100-CPU-high-interrupts-on-ACPI

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Thank you!

Its like i was going to make exact same forumthread as you describe here.

I have been going nuts with CPU 0 going 100% after a restart. When PC has been shut down 4+  hoursm i have normal idle process and cpu is running 2%.

I have exactly the same config as you have, i build brand new ROG PC with B460-F motherboard with Intel 10400F CPU and this issue has been since i built this PC half week ago. What is ASUS doing? i have tried latest beta BIOS and now went back to latest stable, same issue. I tried litterly everything in Windows OS but lost hope and starting to track via Windows Performance Recorder/Analyzer and ACPI.sys causing this on ASUS motherboard is not new.

You did this thread 7 hours ago and it was like my forumthread in the future.

 

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4 hours ago, Ekenn9113 said:

Thank you!

Its like i was going to make exact same forumthread as you describe here.

I have been going nuts with CPU 0 going 100% after a restart. When PC has been shut down 4+  hoursm i have normal idle process and cpu is running 2%.

I have exactly the same config as you have, i build brand new ROG PC with B460-F motherboard with Intel 10400F CPU and this issue has been since i built this PC half week ago. What is ASUS doing? i have tried latest beta BIOS and now went back to latest stable, same issue. I tried litterly everything in Windows OS but lost hope and starting to track via Windows Performance Recorder/Analyzer and ACPI.sys causing this on ASUS motherboard is not new.

You did this thread 7 hours ago and it was like my forumthread in the future.

 

Did you try my solution?

 

It's crazy. I'm never going ASUS again. I am 100% sure there are thousands of people out there with similar builds that simply don't KNOW that this bug is running and constantly using their CPUs and raising the temps.

I would still love if someone could explain my solution a bit, and maybe show other alternatives.

 

This is BEFORE:

threads.png.6f1d08e4eee8923fe7bad09f486c6325.png

618074132_CoreUsage.png.56f500d5daaadc47bb0b4b3cc6050035.png

 

This is AFTER:

 

lol.png.0a5d90d3d11e0856e6ec5a0c2eb2d2d9.png

 

aftert.png.a2b6269b76462f9ff6c5b9594eac1437.png

 

 

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I read the TB issue thread yesterday but mine was disabled as default already.

Should i turn it on in BIOS and then disable PCIE Root Port as you did?

My system was fine when i started it up this morning and did a reboot just recently and we back to this xD

 

image.png.5810ccdb7b9517df8a87f8a1802b1fc8.png

 

Core 0 spiking.

 

image.thumb.png.0c012823eb4a9525375043be521cdcff.png

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Just now, Ekenn9113 said:

I read the TB issue thread yesterday but mine was disabled as default already.

Should i turn it on in BIOS and then disable PCIE Root Port as you did?

My system was fine when i started it up this morning and did a reboot just recently and we back to this xD

 

image.png.5810ccdb7b9517df8a87f8a1802b1fc8.png

 

Core 0 spiking.

 

image.thumb.png.0c012823eb4a9525375043be521cdcff.png

Literally the EXACT problem as me. (och du är svensk!)

Yes, try my solution. Turn on discrete thunderbolt support then go to device manager in windows and turn off the newly added PCI Express Root Port.

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THIS DID THE TRICK! (Ps. Vilken legend du är!)

I rebooted and turned on Thunderbolt Descrete option. Rebooted and as you mentioned, refreshed device manager and issue was gone fore 2 seconds and then back again.

Disabled  image.png.d98d16ad3e29fac50cd5b3bf4c2d2457.png

 

All back to normal.

 

image.thumb.png.5e06ed897cd2834587e37e35a3678730.png

 

YES!!!!

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4 minutes ago, Ekenn9113 said:

THIS DID THE TRICK! (Ps. Vilken legend du är!)

I rebooted and turned on Thunderbolt Descrete option. Rebooted and as you mentioned, refreshed device manager and issue was gone fore 2 seconds and then back again.

Disabled  image.png.d98d16ad3e29fac50cd5b3bf4c2d2457.png

 

All back to normal.

 

image.thumb.png.5e06ed897cd2834587e37e35a3678730.png

 

YES!!!!

 

Omg. This is so weird. I was literally just about to give up and ready to run with this bug for ever.

Can someone tell ASUS to fix this? This is the only fix I've ever found to work. I can't imagine how many ppl run with this unknowingly.

 

What I'm scared of now is windows update messing and installing some ASUS update that overuns it all.

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This feeling 🙂 Yes ASUS need to fix this.

This forumthread should go for investigation.

 

image.thumb.png.46e8184630dce6f9f159621fb28811ac.png

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Just now, Ekenn9113 said:

This feeling 🙂 Yes ASUS need to fix this.

This forumthread should go for investigation.

 

image.thumb.png.46e8184630dce6f9f159621fb28811ac.png

Let's hope it stays this way. My temperatures are also down 10C since this fix.

So far, it's worked for 13 hours with numerous computer restarts for me. ✊

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FWIW, I'm not convinced this is an Asus bug and more of a Windows-with-Thunderbolt bug, because my Dell work laptop has the same issue. I'm going to try some of these solutions the next time it happens (it isn't constant) to see if I can fix it without restarting.

Main System (Byarlant): Ryzen 7 5800X | Asus B550-Creator ProArt | EK 240mm Basic AIO | 16GB G.Skill DDR4 3200MT/s CAS-14 | XFX Speedster SWFT 210 RX 6600 | Samsung 990 PRO 2TB / Samsung 960 PRO 512GB / 4× Crucial MX500 2TB (RAID-0) | Corsair RM750X | Mellanox ConnectX-3 10G NIC | Inateck USB 3.0 Card | Hyte Y60 Case | Dell U3415W Monitor | Keychron K4 Brown (white backlight)

 

Laptop (Narrative): Lenovo Flex 5 81X20005US | Ryzen 5 4500U | 16GB RAM (soldered) | Vega 6 Graphics | SKHynix P31 1TB NVMe SSD | Intel AX200 Wifi (all-around awesome machine)

 

Proxmox Server (Veda): Ryzen 7 3800XT | AsRock Rack X470D4U | Corsair H80i v2 | 64GB Micron DDR4 ECC 3200MT/s | 4x 10TB WD Whites / 4x 14TB Seagate Exos / 2× Samsung PM963a 960GB SSD | Seasonic Prime Fanless 500W | Intel X540-T2 10G NIC | LSI 9207-8i HBA | Fractal Design Node 804 Case (side panels swapped to show off drives) | VMs: TrueNAS Scale; Ubuntu Server (PiHole/PiVPN/NGINX?); Windows 10 Pro; Ubuntu Server (Apache/MySQL)


Media Center/Video Capture (Jesta Cannon): Ryzen 5 1600X | ASRock B450M Pro4 R2.0 | Noctua NH-L12S | 16GB Crucial DDR4 3200MT/s CAS-22 | EVGA GTX750Ti SC | UMIS NVMe SSD 256GB / Seagate 1.5TB HDD | Corsair CX450M | Hauppauge ImpactVCB-PCIe | Mellanox ConnectX-2 10G NIC | LG UH12NS30 BD-ROM | Silverstone Sugo SG-11 Case | Sony XR65A80K

 

Camera: Sony ɑ7II w/ Meike Grip | Sony SEL24240 | Samyang 35mm ƒ/2.8 | Sony SEL50F18F | Sony SEL2870 (kit lens) | PNY Elite Perfomance 512GB SDXC card

 

Network:

Spoiler
                           ┌─────────────── Office/Rack ────────────────────────────────────────────────────────────────────────────┐
Google Fiber Webpass ────── UniFi Security Gateway ─── UniFi Switch 8-60W ─┬─ UniFi Switch Flex XG ═╦═ Veda (Proxmox Virtual Switch)
(500Mbps↑/500Mbps↓)                             UniFi CloudKey Gen2 (PoE) ─┴─ Veda (IPMI)           ╠═ Veda-NAS (HW Passthrough NIC)
╔═══════════════════════════════════════════════════════════════════════════════════════════════════╩═ Narrative (Asus USB 2.5G NIC)
║ ┌────── Closet ──────┐   ┌─────────────── Bedroom ──────────────────────────────────────────────────────┐
╚═ UniFi Switch Flex XG ═╤═ UniFi Switch Flex XG ═╦═ Byarlant
   (PoE)                 │                        ╠═ Narrative (Cable Matters USB-PD 2.5G Ethernet Dongle)
                         │                        ╚═ Jesta Cannon*
                         │ ┌─────────────── Media Center ──────────────────────────────────┐
Notes:                   └─ UniFi Switch 8 ─────────┬─ UniFi Access Point nanoHD (PoE)
═══ is Multi-Gigabit                                ├─ Sony Playstation 4 
─── is Gigabit                                      ├─ Pioneer VSX-S520
* = cable passed to Bedroom from Media Center       ├─ Sony XR65A80K (Google TV)
** = cable passed from Media Center to Bedroom      └─ Work Laptop** (Startech USB-PD Dock)

 

Retired/Other:

Spoiler

Laptop (Rozen-Zulu): Sony VAIO VPCF13WFX | Core i7-740QM | 8GB Patriot DDR3 | GT 425M | Samsung 850EVO 250GB SSD | Blu-ray Drive | Intel 7260 Wifi (lived a good life, retired with honor)

Testbed/Old Desktop (Kshatriya): Xeon X5470 @ 4.0GHz | ZALMAN CNPS9500 | Gigabyte EP45-UD3L | 8GB Nanya DDR2 400MHz | XFX HD6870 DD | OCZ Vertex 3 Max-IOPS 120GB | Corsair CX430M | HooToo USB 3.0 PCIe Card | Osprey 230 Video Capture | NZXT H230 Case

TrueNAS Server (La Vie en Rose): Xeon E3-1241v3 | Supermicro X10SLL-F | Corsair H60 | 32GB Micron DDR3L ECC 1600MHz | 1x Kingston 16GB SSD / Crucial MX500 500GB

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38 minutes ago, AbydosOne said:

FWIW, I'm not convinced this is an Asus bug and more of a Windows-with-Thunderbolt bug, because my Dell work laptop has the same issue. I'm going to try some of these solutions the next time it happens (it isn't constant) to see if I can fix it without restarting.

I don't use thunderbolt. But maybe you're right. What's obvious is there's a conflict with the MB:s TB configuration and Windows

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  • 4 weeks later...

I had to create an account here just so I could thank you! I've been going crazy over the past few days trying to fix this issue. This did it!

So thank you for saving me so much time and effort! Cheers!

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  • 3 months later...

Many thanks for posting this, I have a ASUS ROG Strix B460-F motherboard with an Intel 10400F CPU and I've had this issue for quite a while. Went down the Windows Performance Analyzer route without success, only a hint that ACPI.SYS was involved.

 

I would never have found this solution without your post, very much appreciated. 👍

 

EDIT:

 

A followup for Linux users, this device is the cause of two issues; high CPU usage at idle (same as Windows) and also suspend/resume problems.

 

One workaround for the high CPU usage (kworker/X:Y+kacpid can use 50-80% of one core at idle) is to add this to root's crontab:

@reboot echo "mask" > /sys/firmware/acpi/interrupts/gpe6F 2>/dev/null

Another option is to add "acpi_mask_gpe=0x6F" to the kernel boot parameters.

 

How did I know it was gpe6F? Check /sys/firmware/acpi/interrupts (e.g. "grep enabled -r /sys/firmware/acpi/interrupts/") and see which one has an interrupt counter (the number in column 1) that rapidly increases.

 

The suspend/resume issue I had was that the machine suspended and then woke up after a couple of seconds. Some Googling led me to /proc/acpi/wakeup, I tried disabling wakeup for the listed (enabled) devices until I found the culprit, this one:

 

RP05      S4    *enabled   pci:0000:00:1c.4

 

Checking PCI devices with lspci and 00:1c.4 turned out to be ... you guessed it ... "PCI Express Root Port #05" (or "Intel Corporation Device a394" on a different distro), aka the device that shows up in Windows device manager when the discrete Thunderbolt support is enabled in BIOS.

 

You disable/enable wakeup for a device by echoing the name of the device to /proc/acpi/wakeup.

 

It can be automated by a script that systemd runs at bootup. The script looks something like this:

#!/bin/bash
 
declare -a devices=("RP05") # <-- List of devices to disable, space separated
for device in "${devices[@]}"; do
    if grep -qw ^$device.*enabled /proc/acpi/wakeup; then
        sudo sh -c "echo $device > /proc/acpi/wakeup"
    fi
done

Save it to /usr/local/bin/disable_acpi_wakeup.sh and make it executable.

 

The systemd unit file looks something like this:

[Unit]
Description=Disable ACPI wakeup for specified devices
 
[Service]
ExecStart=/usr/local/bin/disable_acpi_wakeup.sh
Type=oneshot
 
[Install]
WantedBy=multi-user.target

Save it to /etc/systemd/system/disable_acpi_wakeup.service.

 

Enable the service, example:

sudo systemctl enable disable_acpi_wakeup.service

That should take care of it.

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  • 3 weeks later...

OMG!!!THANK U VERY MUCH BROO!!< 3

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  • 2 weeks later...

This problem has troubled me for several months, and I have tried many methods. Finally back to normal,thanks!image.png.f869b4d2691bfc64a1ce7c9ff06f2111.png

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  • 1 month later...

Thank you so very much to the poster!!!!!! I was suffering with this problem since November 2019 and have reset/wiped my computer multiple times thanks to the 'help' from Dell and Intel. Words can't express how thankful I am to you!

 

This posted solution solution works with the Dell G7 7790 (i7-9750H, Bios 1.15.3, 16 GB RAM, 256GB NVME + 1TB HDD)

driver.PNG.b16aeeb5b95dcd10fc7817ceb7e8133d.PNG

 

PLEASE NOTE: You MUST turn on thunderbolt in the BIOS if you already turned it off as noted in the original post; the driver is hidden when thunderbolt is turned off.

 

cores.PNG.2e20ef2d201a03703e9e6c5a94614654.PNG

Laptop is now sitting at 45-48 degrees Celsius on idle, previously at 65 degrees celcuis. This was always important to me since most of the time I have my laptop on my lap and 65 degrees feels like an oven most of the time XD

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  • 8 months later...

Duuuuuuuuude you are awesome !!! I was searching that issue 10 months and couldn’t find the problem !!! This acc was created only to say THANK YOUUUU!!!!!!!!!!!!!!!

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