irq/174-AudioDS causing high cpu load since 20.04.02

[Gary Shipman]

System runs perfect with Ubuntu 20.04.1 with no updates.

If i run 20.04.2 and 20.04.3 live or install i have high cpu load (80%) with irq/174- AudioDS process.

Battery life goes from 10+ hours to 4 hours.

Laptop is Acer Swift 3 SF314 11th gen i5 with 8 gb ram.

Have found several people with the same problem but no answers.

[Ubuntu Foundations Team Bug Bot (crichton)]

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[AJay (aj-u-area)]

I face exactly the same issue.
The same laptop model - acer swift 3 314-59 (intel i5 11-th gen.)
From dmidecode:

BIOS Information
 Vendor: Insyde Corp.
 Version: V1.07
 Release Date: 01/18/2021

System Information
 Manufacturer: Acer
 Product Name: Swift SF314-59
 Version: V1.07

 Family: Swift 3

Ubuntu version:
NAME="Ubuntu"
VERSION="20.04.3 LTS (Focal Fossa)"

uname -a:
Linux ubuntu 5.11.0-27-generic #29~20.04.1-Ubuntu SMP Wed Aug 11 15:58:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

top:

%Cpu(s): 1.5 us, 9.0 sy, 0.0 ni, 89.5 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 15805.1 total, 8628.6 free, 2797.5 used, 4379.0 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 10685.2 avail Mem

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
   1295 root -51 0 0 0 0 R 68.8 0.0 166:35.30 irq/175-AudioDS
  27953 ubuntu 20 0 910360 89396 49544 S 6.2 0.6 5:46.58 Xorg

One cpu thread is always busy as pictured.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[AJay (aj-u-area)]

See also: https://askubuntu.com/questions/1361496/irq-185-audiods-using-more-than-60-of-the-cpu
Unloading sound modules using "sudo alsa unload" frees cpu resources.
Seems to be related to intel soundwire kernel module.
[ 2430.491653] sdw_cdns_irq: 137830 callbacks suppressed
[ 2430.491658] intel-sdw intel-sdw.0: Bus clash for control word
[ 2430.491683] intel-sdw intel-sdw.1: Bus clash for control word
[ 2430.491736] intel-sdw intel-sdw.0: Bus clash for control word

I've verified the problem with the 5.13 kernel from 21.10 and that kernel fixes the issue.
root@ubuntu:~# uname -a
Linux ubuntu 5.13.0-16-generic #16-Ubuntu SMP Fri Sep 3 14:53:27 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
root@ubuntu:~# head /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=21.10
DISTRIB_CODENAME=impish
DISTRIB_DESCRIPTION="Ubuntu Impish Indri (development branch)"

So the problem will probably be solved with the new HWE for 20.04 based on the 21.10 kernel.

[Gary Shipman (gary0945)]

Sorry about the late reply.

Thank you for that information.

Kind regards,
Gary.

On Fri, Sep 17, 2021 at 5:40 PM AJay <email address hidden> wrote:

> See also:
> https://askubuntu.com/questions/1361496/irq-185-audiods-using-more-than-60-of-the-cpu
> Unloading sound modules using "sudo alsa unload" frees cpu resources.
> Seems to be related to intel soundwire kernel module.
> [ 2430.491653] sdw_cdns_irq: 137830 callbacks suppressed
> [ 2430.491658] intel-sdw intel-sdw.0: Bus clash for control word
> [ 2430.491683] intel-sdw intel-sdw.1: Bus clash for control word
> [ 2430.491736] intel-sdw intel-sdw.0: Bus clash for control word
>
> I've verified the problem with the 5.13 kernel from 21.10 and that kernel
> fixes the issue.
> root@ubuntu:~# uname -a
> Linux ubuntu 5.13.0-16-generic #16-Ubuntu SMP Fri Sep 3 14:53:27 UTC 2021
> x86_64 x86_64 x86_64 GNU/Linux
> root@ubuntu:~# head /etc/lsb-release
> DISTRIB_ID=Ubuntu
> DISTRIB_RELEASE=21.10
> DISTRIB_CODENAME=impish
> DISTRIB_DESCRIPTION="Ubuntu Impish Indri (development branch)"
>
> So the problem will probably be solved with the new HWE for 20.04 based
> on the 21.10 kernel.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1943392
>
> Title:
> irq/174-AudioDS causing high cpu load since 20.04.02
>
> Status in Ubuntu:
> Confirmed
>
> Bug description:
> System runs perfect with Ubuntu 20.04.1 with no updates.
>
> If i run 20.04.2 and 20.04.3 live or install i have high cpu load
> (80%) with irq/174- AudioDS process.
>
> Battery life goes from 10+ hours to 4 hours.
>
> Laptop is Acer Swift 3 SF314 11th gen i5 with 8 gb ram.
>
> Have found several people with the same problem but no answers.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+bug/1943392/+subscriptions
>
>

[Cristian Galleguillos (cgmiccono)]

I have the following version of ubuntu and kernel on a Acer Swift 3 (SF314):

cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=21.04
DISTRIB_CODENAME=hirsute
DISTRIB_DESCRIPTION="Ubuntu 21.04"

uname -a
Linux IDRO-58 5.14.0-051400-generic #202108292331 SMP Sun Aug 29 23:33:39 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

The problem sometimes appears, then i have to reboot and it disappears. Using the original kernel of Hirsute, the problem appeared after logging.

Best

[Dan (ramata)]

The same bug on the same laptop, but system is LM 20.2 (based on ubuntu 20.04).