Spamming of line 98: echo: write error: Device or resource busy

[dotfrag]

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Have you tried?

• Searching through existing/closed issues to see if your bug has already been already submitted?

Yes, I have found multiple issues but they claim that it has been resolved.

EDIT: I have possibly duplicated #724, I'm sorry if that's the case, I should have been more careful. Specifically:

When the governor is set to performance, only performance EPP is available as you can see in the screenshot below. By default auto-cpufreq tries to set balance-performance which might be causing this issue because such an EPP is not available.

• If installation failed with auto-cpufreq-installer,have you tried installing auto-cpufreq using Snap package?

Not failed.

• Have you tried configuring auto-cpufreq?

Yes.

• Have you tried suggestions in troubleshooting section?

I checked, but the issue is not listed.

Error output:

Lenovo Thinkpad P16s AMD gpu, more hardware info below. Ubuntu - installed with installer script.

● auto-cpufreq.service - auto-cpufreq - Automatic CPU speed & power optimizer for Linux
     Loaded: loaded (/etc/systemd/system/auto-cpufreq.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2024-07-24 17:56:20 EEST; 4min 55s ago
   Main PID: 29827 (python)
      Tasks: 2 (limit: 71724)
     Memory: 18.1M
        CPU: 5.700s
     CGroup: /system.slice/auto-cpufreq.service
             └─29827 /opt/auto-cpufreq/venv/bin/python /opt/auto-cpufreq/venv/bin/auto-cpufreq --daemon

Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jul 24 18:01:14  python[35039]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy

---

System information:

Add/paste output of:

-------------------------------- Battery Info ---------------------------------

battery count = 1
BAT0 start threshold = 0
BAT0 start threshold = 100

-------------------------------------------------------------------------------

Linux distro: Ubuntu 22.04 Jammy Jellyfish
Linux kernel: 6.5.0-1025-oem
Processor: AMD Ryzen 7 PRO 7840U w/ Radeon 780M Graphics
Cores: 16
Architecture: x86_64
Driver: amd-pstate-epp

------------------------------ Current CPU stats ------------------------------

CPU max frequency: 6076 MHz
CPU min frequency: 400 MHz

Core	Usage	Temperature	Frequency
CPU0      1.0%        46 °C       400 MHz
CPU1      0.0%        46 °C       400 MHz
CPU2      1.0%        46 °C       400 MHz
CPU3      1.0%        46 °C       400 MHz
CPU4      2.0%        46 °C      3267 MHz
CPU5      0.0%        46 °C       400 MHz
CPU6      0.0%        46 °C       400 MHz
CPU7      0.0%        46 °C      2972 MHz
CPU8      1.0%        46 °C      3116 MHz
CPU9      0.0%        46 °C      3268 MHz
CPU10      0.0%        46 °C       400 MHz
CPU11      0.0%        46 °C      3269 MHz
CPU12      1.0%        46 °C      3191 MHz
CPU13      0.0%        46 °C       400 MHz
CPU14      0.0%        46 °C      3268 MHz
CPU15      0.0%        46 °C       400 MHz

CPU fan speed: 1990 RPM

auto-cpufreq version: 2.3.0 (git: a7df94d)

Python: 3.10.12
psutil package: 5.9.8
platform package: 1.0.8
click package: 8.1.7
distro package: 1.9.0

Computer type: Notebook
Battery is: charging

auto-cpufreq system resource consumption:
cpu usage: 0.0 %
memory use: 0.05 %

Total CPU usage: 3.2 %
Total system load: 0.04
Average temp. of all cores: 46.00 °C 

Currently using: performance governor
CPU turbo is controlled by amd-pstate-epp driver
Currently turbo boost is: off

-------------------------------------------------------------------------------

Also please be descriptive about the issue you're reporting, i.e: what you tried & what's the expected behaviour.

Line 98 is:

function write_value () {
  if [ -w $FLNM ]; then echo $VALUE > $FLNM; fi
}

This only happens with performance governor. Switching to powersave doesn't give any error. Charger plugged in or not makes no difference.

EDIT: I have possibly duplicated #724, I'm sorry if that's the case, I should have been more careful. Specifically:

When the governor is set to performance, only performance EPP is available as you can see in the screenshot below. By default auto-cpufreq tries to set balance-performance which might be causing this issue because such an EPP is not available.

❯ cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences
performance

[dotfrag]

I have updated to 24.04 LTS and the issue is gone. It seems that auto-cpufreq is no longer trying to load balanced_performance.

[AdnanHodzic]

I'm also on 24.04 for awhile and also don't have this problem, hence will close the issue. Please feel free to re-open if issue persist.