71 lines
2.4 KiB
Markdown
71 lines
2.4 KiB
Markdown
# Power Management
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veilor-os ships a 3-mode power profile system backed by `tuned`.
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## Profiles
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| Profile | Governor | EPP | Boost | ASUS TTP | Use |
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|---------|----------|-----|-------|----------|-----|
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| `veilor-powersave` | powersave | power | off | 2 (silent) | max battery |
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| `veilor-balanced` | powersave | balance_performance | on | 1 (mid) | on the go |
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| `veilor-performance` | performance | performance | on | 0 (full) | plugged in |
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`ASUS TTP` (throttle_thermal_policy) only applies to ASUS laptops with
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`asus-nb-wmi`. On other hardware those writes are silently skipped.
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## Switching
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```bash
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veilor-power save # max battery (aliases: powersave, s)
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veilor-power mid # balanced (aliases: balanced, b)
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veilor-power perf # performance (aliases: performance, p)
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veilor-power # status: profile, governor, EPP, boost, freq
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```
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`veilor-power` calls `tuned-adm` via a NOPASSWD sudoers drop-in
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locked to `veilor-*` profiles only (`/etc/sudoers.d/veilor-power`).
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## Auto-switch on AC plug/unplug
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`/etc/udev/rules.d/90-veilor-ac-switch.rules`:
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```
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SUBSYSTEM=="power_supply", ATTR{online}=="0", RUN+="/usr/bin/tuned-adm profile veilor-powersave"
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SUBSYSTEM=="power_supply", ATTR{online}=="1", RUN+="/usr/bin/tuned-adm profile veilor-performance"
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```
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Override anytime with `veilor-power mid`.
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## Battery longevity
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`/etc/udev/rules.d/91-veilor-battery-threshold.rules` caps charge at
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80% on supported hardware. Adjust by editing the rule or:
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```bash
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echo 100 | sudo tee /sys/class/power_supply/BAT0/charge_control_end_threshold
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```
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## What each profile actually does
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`/etc/tuned/profiles/veilor-<profile>/script.sh` writes:
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- `/sys/devices/system/cpu/cpufreq/boost`
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- `/sys/devices/platform/asus-nb-wmi/throttle_thermal_policy` (ASUS only)
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- `/sys/bus/pci/devices/*/power/control` (NVMe autosuspend)
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- `/sys/class/drm/card*/device/power_dpm_force_performance_level` (AMD iGPU)
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- `usb_autosuspend` enable/disable
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All writes are guarded with `[ -w ... ]` so non-applicable hardware
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silently no-ops.
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## Persistence
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`tuned.service` starts at boot and loads the last active profile from
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`/var/lib/tuned/save.conf`. No GRUB params needed.
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## Caveat: `platform_profile` vs `throttle_thermal_policy`
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On some ASUS laptops the `platform_profile` sysfs key maps to TTP in
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non-obvious order (e.g. `quiet`→TTP2, `balanced`→TTP0,
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`performance`→TTP1). veilor profiles write TTP directly and never
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touch `platform_profile` to avoid the second-write override race.
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