fix: display actual EPP and EPB values in stats output

[RafaeruAybu]

Previously, the stats output was showing values from the config file instead of actual system values. This fixes the issue by:

1. Reading EPP directly from /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference
2. Reading EPB from /sys/devices/system/cpu/cpu0/power/energy_perf_bias and converting numeric values to string representations

This ensures that the displayed values reflect the actual current system settings rather than the configured values.
I am new in PR culture, so any suggestion are welcome.

[RafaeruAybu]

I am still not sure, if this can be applied to all systems with different cpus and OS. I noticed that GTK version works good. It works by reading auto_cpufreq_stats_file.

[Copilot]

Pull Request Overview

This PR fixes the current_epp and current_epb methods to read actual system values instead of configuration values. The key changes include:

• Changed both methods from reading config values to reading actual hardware values from sysfs
• Corrected the epb_path from the incorrect /sys/devices/system/cpu/intel_pstate to the proper /sys/devices/system/cpu/cpu0/power/energy_perf_bias
• Added numeric-to-string conversion logic for EPB values (0→"performance", 4→"balance_performance", 6→"default", 8→"balance_power", 15→"power")

Comments suppressed due to low confidence (3)

auto_cpufreq/modules/system_info.py:147

• The is_ac_plugged parameter is no longer used in the method implementation. This parameter should be removed to avoid confusion and maintain a clean API, as the method now reads the actual system value rather than configuration-based values.

    def current_epp(is_ac_plugged: bool) -> str | None:

auto_cpufreq/modules/system_info.py:155

• Except block directly handles BaseException.

        except:

auto_cpufreq/modules/system_info.py:180

• Except block directly handles BaseException.

        except:

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[Copilot]

Bare except clause catches all exceptions including system-exiting exceptions like KeyboardInterrupt and SystemExit. Replace with a specific exception type like except (FileNotFoundError, OSError, IOError) to handle expected file operation errors.

[Copilot]

Bare except clause catches all exceptions including system-exiting exceptions like KeyboardInterrupt and SystemExit. Replace with a specific exception type like except (FileNotFoundError, OSError, ValueError, IOError) to handle expected file operation and conversion errors.

[AdnanHodzic]

I'm bit bothered by cpu0 in /sys/devices/system/cpu/cpu0/power/energy_perf_bias line. Would love it could somehow be made more generic, as in some weird situation someone doesn't have cpu0 (crazy, but not impossible). User will get an error.

[AdnanHodzic]

I'm running on Intel and using pstate driver, but replacing epb_path = "/sys/devices/system/cpu/intel_pstate" doesn't seem to affect me.

Would also be nice if these changes would be made made in more generic way depending on which driver user is using.

[Copilot]

The is_ac_plugged parameter is no longer used in the method implementation. This parameter should be removed to avoid confusion and maintain a clean API, as the method now reads the actual system value rather than configuration-based values.

[AdnanHodzic]

Thank you for PR, welcome to open source and let's work on getting these changes merged :)

I left a couple of comments and I also asked on auto-cpufreq discord community for others to test these changes to make sure they work every architecture.

Rest of things were raised by Copilot, nothing major but would be good if they were addressed.

Also, to resolve any ambiguity:

Previously, the stats output was showing values from the config file instead of actual system values. This fixes the issue by ...

Could you please tell me how do your stats output differ before and with this PR? As besides seeing EPP setting: performance and Setting to use: "balance_performance" EPB it looks the same to me as before.