/usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy

[TheChilledBuffalo]

• Searching through existing/closed issues to see if your bug has already been already submitted? Yes
• If installation failed with auto-cpufreq-installer,have you tried installing auto-cpufreq using Snap package? No
• Have you tried configuring auto-cpufreq? Yes
• Have you tried suggestions in troubleshooting section? No

Error output:

sudo systemctl status auto-cpufreq.service          
[sudo] password for abhishek: 
● auto-cpufreq.service - auto-cpufreq - Automatic CPU speed & power optimizer for Linux
     Loaded: loaded (/etc/systemd/system/auto-cpufreq.service; enabled; preset: disabled)
     Active: active (running) since Thu 2024-06-20 12:59:25 IST; 7min ago
   Main PID: 602 (python)
      Tasks: 2 (limit: 18175)
     Memory: 40.3M (peak: 44.8M)
        CPU: 7.555s
     CGroup: /system.slice/auto-cpufreq.service
             └─602 /opt/auto-cpufreq/venv/bin/python /opt/auto-cpufreq/venv/bin/auto-cpufreq --daemon

Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy
Jun 20 13:07:10 archlinux-loq python[10949]: /usr/local/bin/cpufreqctl.auto-cpufreq: line 98: echo: write error: Device or resource busy

---

System information:

Add/paste output of:

Using settings defined in /etc/auto-cpufreq.conf file
could not get value from conservation mode

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

battery count = 1
BAT1 start threshold = cat: /sys/class/power_supply/BAT1/charge_start_threshold: No such file or directory
BAT1 start threshold = cat: /sys/class/power_supply/BAT1/charge_stop_threshold: No such file or directory

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

Linux distro: Arch Linux  
Linux kernel: 6.9.5-zen1-1-zen
Processor: AMD Ryzen 7 7840HS w/ Radeon 780M Graphics
Cores: 16
Architecture: x86_64
Driver: amd-pstate-epp

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

CPU max frequency: 5137 MHz
CPU min frequency: 400 MHz

Core	Usage	Temperature	Frequency
CPU0      5.0%        53 °C      4838 MHz
CPU1      0.0%        53 °C      3446 MHz
CPU2      5.1%        53 °C      4828 MHz
CPU3      2.0%        53 °C      3219 MHz
CPU4      3.0%        53 °C      3218 MHz
CPU5      1.0%        53 °C      3870 MHz
CPU6      6.1%        53 °C      4840 MHz
CPU7     43.0%        53 °C      4838 MHz
CPU8      4.0%        53 °C      3224 MHz
CPU9      0.0%        53 °C      4243 MHz
CPU10      9.0%        53 °C      4839 MHz
CPU11      6.1%        53 °C      3472 MHz
CPU12      2.0%        53 °C      3219 MHz
CPU13      0.0%        53 °C       400 MHz
CPU14      7.0%        53 °C      3479 MHz
CPU15     17.0%        53 °C      4220 MHz

auto-cpufreq version: 2.3.0 (git: 2fdb703)

Python: 3.12.3
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: 0.22 %

Total CPU usage: 7.1 %
Total system load: 1.56
Average temp. of all cores: 53.00 °C 

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

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

First of all I would like to acknowledge the fact that there have been multiple issues opened for this same problem, like #138 , #661 and #563

From what I gathered from those threads, this issue has been patched for Intel CPUs. But I'm using an AMD CPU and this issue is still present. And I might have a lead as to why this is happening. On Intel CPUs, having HWP active caused this issue and was patched in #147 . And it was later found that intel_pstate supports only the performance EPP when the governor is set to performance which was patched in #680 . And I have a feeling its the exact same issue on amd_pstate as well. 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.

So I think adding a patch similar to #680 but for amd_pstate this time, can be the fix for this issue. After this discussion, if this fix seems viable, I can send a PR.

---

[AdnanHodzic]

Considering #725 has been merged, closing the issue, if anyone runs into this problem please feel free to re-open.

[DungNg]

This code has an issue where if you use governor power and want to use other epp, you cannot change it while charging. Could you please fix this?

[TheChilledBuffalo]

Oh... I didn't notice that. Will send a PR to fix this!