Mans Ziesel
da7c0282c6
The Ryzen 7 3700U (Zen+) lacks CPPC, and the laptop exposes no ACPI platform_profile, so power-profiles-daemon has no real backend and only shows placeholder profiles. Swap the ppd widget for a custom waybar module backed by a small `cpugov` helper that reads and toggles the cpufreq governor directly. Left-click cycles schedutil <-> performance via a NOPASSWD sudo rule scoped to the wrapper path. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
80 lines
2.3 KiB
Nix
80 lines
2.3 KiB
Nix
{
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config,
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lib,
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pkgs,
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...
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}:
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# CPU governor toggle for hosts without a power-profiles-daemon backend
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# (e.g. Zen+ CPUs that lack CPPC and laptops with no ACPI platform_profile).
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# Installs a `cpugov` helper used by the waybar custom/cpugov widget and
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# allows wheel users to write the governor without a password prompt.
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let
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cpugov = pkgs.writeShellApplication {
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name = "cpugov";
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text = ''
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cur() {
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cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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}
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apply() {
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local gov="$1"
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case "$gov" in
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performance|schedutil|powersave|ondemand|conservative|userspace) ;;
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*) echo "Unsupported governor: $gov" >&2; exit 1 ;;
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esac
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for f in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do
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printf '%s\n' "$gov" > "$f"
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done
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}
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cycle() {
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case "$(cur)" in
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schedutil) apply performance ;;
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performance) apply schedutil ;;
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*) apply schedutil ;;
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esac
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}
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status() {
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local gov
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gov=$(cur)
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case "$gov" in
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performance) printf '{"text":" perf ","tooltip":"CPU governor: performance","class":"performance"}\n' ;;
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schedutil) printf '{"text":" sched ","tooltip":"CPU governor: schedutil","class":"schedutil"}\n' ;;
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*) printf '{"text":" ⚙ %s ","tooltip":"CPU governor: %s","class":"other"}\n' "$gov" "$gov" ;;
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esac
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}
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case "''${1:-status}" in
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status) status ;;
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cycle) cycle ;;
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set) apply "''${2:-}" ;;
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*) echo "Usage: cpugov [status|cycle|set <gov>]" >&2; exit 1 ;;
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esac
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'';
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};
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in
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{
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config = lib.mkIf config.custom.isLaptop {
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environment.systemPackages = [ cpugov ];
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# Writing scaling_governor requires root; allow wheel members to call
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# the helper without a password so the waybar widget can toggle on click.
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# Sudo matches command paths literally (no symlink canonicalization), so
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# use the stable wrapper path instead of the per-build store path.
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security.sudo.extraRules = [
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{
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groups = [ "wheel" ];
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commands = [
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{
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command = "/run/current-system/sw/bin/cpugov";
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options = [ "NOPASSWD" ];
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}
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];
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}
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];
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};
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}
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