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#1 2025-01-15 05:15:59

mwooper
Member
Registered: 2023-09-22
Posts: 73

Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

so I noticed this after updating my system on Jan 10, randomly my system will experience a sudden frame drop (from 165 fps to like 0.5 fps) and even after I kill the Graphical environment and return to TTY, it will still remain at .5 fps. And it'll only get resolved when I reboot the system.

So I thought it to be caused by the new kernel so I downgraded to 6.12.7 from 6.12.8 but the problem still persists (it still does for 6.12.9)

Then I noticed whenever I experience such drops the kworker processes seem to hog a lot on CPU resources, like in CPU% and individual process may continously be hogging 6.1% of CPU resources and one kworker releases that resource another kworker hogs onto the 6.1%. (and always one of my 16 CPU threads is under 99% load in such scenarios)

My hardware info:
Model: ASUS TUF Gaming A16 FA617XS (1.0)
CPU: AMD Ryzen 9 7940HS w/ Radeon 780M Graphics (16) @ 5.26 GHz
GPU 1: AMD Radeon RX 7600S [Discrete]
GPU 2: AMD Radeon 780M [Integrated]
Memory: 14.85 GiB

Last edited by mwooper (2025-01-15 14:25:42)

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#2 2025-01-15 11:04:39

mwooper
Member
Registered: 2023-09-22
Posts: 73

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

I do have asusctl and supergfxctl installed from aur but they were last upgraded in Septmber and November of last year respectively

Last edited by mwooper (2025-01-15 11:04:52)

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#3 2025-01-15 12:25:33

xerxes_
Member
Registered: 2018-04-29
Posts: 952

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

But this frame drop, fps is related to what: a game, a program? How do you measure it?

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#4 2025-01-15 12:36:21

mwooper
Member
Registered: 2023-09-22
Posts: 73

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

its not related to any app in particular it would just randomly start to happen.
And like I said, I would kill all Graphical software (even the wayland compositor) and return to TTY and it would still be have 0.5 fps display in the TTY too.

It'll only stop when I reboot the system.

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#5 2025-01-15 13:17:27

xerxes_
Member
Registered: 2018-04-29
Posts: 952

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

Post full output of command: 'sudo journalctl -b'.

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#6 2025-01-15 13:32:21

mwooper
Member
Registered: 2023-09-22
Posts: 73

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

Here it is: http://0x0.st/8oQE.txt //This one is after I downgraded my enitre system to 2025-01-01

// Boot Entry for one with all the latest updates in which the problem was encountered [command used -> journalctl -b -3 | curl -F 'file=@-' 0x0.st]
http://0x0.st/8oQC.txt

Last edited by mwooper (2025-01-15 13:57:06)

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#7 2025-01-16 20:33:36

shooting_star
Member
Registered: 2023-06-10
Posts: 3

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

The same is happening to me.
Yoga 7 14ARP8
Linux 6.12.9-zen1-1-zen
AMD Ryzen 7 7735U
AMD Radeon 680M [Integrated]

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#8 2025-01-17 05:27:36

mwooper
Member
Registered: 2023-09-22
Posts: 73

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

shooting_star wrote:

The same is happening to me.
Yoga 7 14ARP8
Linux 6.12.9-zen1-1-zen
AMD Ryzen 7 7735U
AMD Radeon 680M [Integrated]

Hey @shooting_star,
can you tell what graphical enviornment you use?

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#9 2025-01-17 06:35:36

shooting_star
Member
Registered: 2023-06-10
Posts: 3

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

mwooper wrote:
shooting_star wrote:

The same is happening to me.
Yoga 7 14ARP8
Linux 6.12.9-zen1-1-zen
AMD Ryzen 7 7735U
AMD Radeon 680M [Integrated]

Hey @shooting_star,
can you tell what graphical enviornment you use?

I use Hyprland (Wayland).
I've also noticed that the issue stays for the shutdown screen.
I hope that answers your question!

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#10 2025-01-17 08:48:17

Tyfaspo
Member
Registered: 2025-01-17
Posts: 1

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

I am experiencing the same issue. Whole system is lagging, persists during shutdown as well.

lenovo yoga pro 7 14ahp9
Linux 6.12.9-arch1-1
Hyprland 0.46.2
AMD Ryzen 7 8845HS
AMD Radeon 780M [integrated]
RTX 3050 6gb

Edit: not zen, regular kernel.

Last edited by Tyfaspo (2025-01-17 12:40:20)

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#11 2025-01-18 19:03:59

harryy
Member
Registered: 2020-03-20
Posts: 3

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

Have similar problems, running LTS kernel seems to be the solution for now.

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#12 2025-02-20 14:30:58

harryy
Member
Registered: 2020-03-20
Posts: 3

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

Well, happened with the LTS kernel as well now.
My issues seems to be related to the amdgpu kernel module.

Added some module parameters yesterday, and the problem seems to be gone.

$ cat /etc/modprobe.d/amdgpu.conf
options amdgpu sg_display=0
options amdgpu dcdebugmask=0x10

Can also be done with kernel parameters

amdgpu.sg_display=0 amdgpu.dcdebugmask=0x10

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#13 2025-07-09 09:25:06

prayag2
Member
Registered: 2025-07-09
Posts: 1

Re: Kworker/u64:{} randomly starts to hogg on CPU causing frame drop.

I've been facing the exact same issue on my laptop with an amd ryzen 5 6600h and rtx 3050. It seems like something is wrong with the amd drivers although I'm not sure.  Did you ever face this issue after adding those module parameters?

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