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docFarto

Member

Registered: 2021-11-18

Posts: 24

Lenovo Thinkpad Yoga 260 High CPU usage

Hey I am following instructions from this page https://wiki.archlinux.org/title/Lenovo … d_Yoga_260
I just got my lenovo thinkpad yoga 260, I am running the latest arch on it. I am using i3
and I am trying to deal with an incredibly high idle

when I run mpstat

01:04:12 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle
01:04:12 PM  all    1.64    0.00    0.82    0.12    0.17    0.07    0.00    0.00    0.00   97.19

as you can see idle is at 97.19%, so it is incredibly high as the wiki article states it would be
So I have run

grep . -r /sys/firmware/acpi/interrupts

and get

....
/sys/firmware/acpi/interrupts/gpe54:       0         invalid      unmasked
/sys/firmware/acpi/interrupts/gpe16:     434  EN     enabled      unmasked
/sys/firmware/acpi/interrupts/sci:     439
/sys/firmware/acpi/interrupts/gpe44:       0         invalid      unmasked
....

gpe16 and sci are always high it happens to be at 434 atm, but I have seen them up in the 3000s
so this seems to follow the article perfectly

so I run (as root, not sudo)

echo "disable" > /sys/firmware/acpi/interrupts/gpe16

and

echo "disable" > /sys/firmware/acpi/interrupts/sci

but when I run mpstat again it still says the idle is >90% every time

running (again as root)

grep . -r /sys/firmware/acpi/interrupts

I get

....
/sys/firmware/acpi/interrupts/gpe16:       0         disabled     unmasked
/sys/firmware/acpi/interrupts/sci:       0
....

but the mpstat still claims I have a high idle. I have tried disabling just gpe16 and just sci and it doesn't change mpstat.
Am I missing something? I have tried running top and my CPU percentage doesn't seem very high. Its currently at 0.7%cpu usage

Zod

Member

From: Hoosiertucky

Registered: 2019-03-10

Posts: 636

Re: Lenovo Thinkpad Yoga 260 High CPU usage

Maybe I'm looking at it wrong, but isn't "%idle" the percentage of time it spends at idle?

I mean it seems to me that it is saying it is spending 97.1 percent of its time doing nothing.

docFarto

Member

Registered: 2021-11-18

Posts: 24

Re: Lenovo Thinkpad Yoga 260 High CPU usage

Oh yeah, you are right. Thank you haha my bad, maybe it is working then.

Does anyone know a good way to test this out, I am only concerned because its on the wiki. The performance of my laptop seems fine, but I would hate to burn it out unnecessarily due to high idles
Is there any down side to disabling these interrupts regardless? I haven't set up the service script yet, but maybe I should just to be on the safe side?

Any thoughts or opinions would be gratefully accepted!