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High CPU usage of one core with custom module #5303

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High CPU usage of one core with custom module#5303
Labels
audiobacklightbatterybugSomething isn't workingclockcpucustomdiskhyprlandinhibitorkeyboardmemorynetworksnitemperature

Description

@Spixmaster
Spixmaster
opened on Sep 5, 2026

Describe the bug
Enabling one of my custom modules lets one CPU core compute at 100 %. Related to #846 and #2631. The problem is only due to custom/package-updates from my testing.

To reproduce
Steps to reproduce the behaviour, including a minimal config that triggers it:

{
    "exclusive": true,
    "fixed-center": true,
    "height": 30,
    "id": "",
    "include": [
        "./modules/backlight.jsonc",
        "./modules/battery.jsonc",
        "./modules/clock.jsonc",
        "./modules/cpu.jsonc",
        "./modules/custom.jsonc",
        "./modules/disk.jsonc",
        "./modules/hyprland.jsonc",
        "./modules/keyboard-state.jsonc",
        "./modules/memory.jsonc",
        "./modules/network.jsonc",
        "./modules/privacy.jsonc",
        "./modules/systemd-failed-units.jsonc",
        "./modules/temperature.jsonc",
        "./modules/tray.jsonc",
        "./modules/wireplumber.jsonc"
    ],
    "ipc": false,
    "layer": "top",
    "margin": "0",
    "margin-bottom": "0",
    "margin-left": "0",
    "margin-right": "0",
    "margin-top": "0",
    "mode": "dock",
    "modifier-reset": "press",
    "modules-center": [
        "custom/package-updates", // TODO Disabling this solves the issue.
        "systemd-failed-units",
        "custom/new-e-mails",
        "privacy"
    ],
    "modules-left": [
        "hyprland/workspaces",
        "hyprland/window"
    ],
    "modules-right": [
        "wireplumber#source",
        "wireplumber#sink",
        "backlight",
        "disk",
        "cpu",
        //"cpu_graph",
        "temperature",
        "memory",
        "network",
        "battery",
        "keyboard-state",
        "clock",
        "tray"
    ],
    "name": "main",
    "on-sigusr1": "toggle",
    "on-sigusr2": "reload",
    "output": ["eDP-1"],
    "passthrough": false,
    "position": "top",
    "reload_style_on_change": true,
    "spacing": 4,
    "start_hidden": false,
    "width": 1920
}

modules/cusom.jsonc

{
    "custom/package-updates": {
        "datapoints": 20,
        "escape": false,
        "exec": "${HOME}/skripte/statusleiste/paketaktualisierungen.sh",
        "exec-if": "exit 0",
        "exec-on-event": false,
        "expand": false,
        "format": "{text}",
        "graph_type": "line",
        "hide-empty-text": false,
        "interval": 60,
        //"menu": "",
        "menu-actions": [],
        "menu-file": "",
        "on-click": "",
        "on-click-middle": "",
        "on-click-right": "",
        "on-scroll-down": "",
        "on-scroll-up": "",
        "on-update": "",
        "smooth-scrolling-threshold": 0.0,
        //"restart-interval": 0,
        "return-type": "",
        //"signal": "",
        "tooltip": false,
        "tooltip-format": ""
        //"width": "",
    },
    "custom/new-e-mails": {
        "datapoints": 20,
        "escape": false,
        "exec": "${HOME}/skripte/statusleiste/neue-e-post.sh",
        "exec-if": "exit 0",
        "exec-on-event": false,
        "expand": false,
        "format": "{text}",
        "graph_type": "line",
        "hide-empty-text": false,
        "interval": 30,
        //"menu": "",
        "menu-actions": [],
        "menu-file": "",
        "on-click": "",
        "on-click-middle": "",
        "on-click-right": "",
        "on-scroll-down": "",
        "on-scroll-up": "",
        "on-update": "",
        "smooth-scrolling-threshold": 0.0,
        //"restart-interval": 0,
        "return-type": "",
        //"signal": "",
        "tooltip": false,
        "tooltip-format": ""
        //"width": "",
    }
}

statusleiste/paketaktualisierungen.sh

#!/usr/bin/env bash
# This script counts the outdated packages including AUR packages.

if [[ "$#" -ne "0" ]]; then
    echo "Wrong amount of arguments!" >&2
    exit 1
fi

declare packages_outdated
packages_outdated="$(checkupdates 2> /dev/null | wc -l || true)"
readonly packages_outdated
declare packages_outdated_aur
packages_outdated_aur="$(paru -Qmu --devel 2> /dev/null | wc -l || true)"
readonly packages_outdated_aur

echo "$((packages_outdated + packages_outdated_aur))"

Expected behaviour
Low CPU usage.

Screenshots
There are already documentations in #846 and #2631.

Environment

  • Waybar version (waybar --version): Waybar v0.15.0
  • Installed from (distro package / source / other): Arch Linux
  • Compositor and version (Sway, Hyprland, River, …): Hyprland

Debug output
Run waybar -l debug and paste any relevant output:

❯ waybar -l debug
[2026-09-05 09:11:18.142] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/config
[2026-09-05 09:11:18.142] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/config.jsonc
[2026-09-05 09:11:18.142] [debug] Found config file: /home/matheus/.config/waybar/config.jsonc
[2026-09-05 09:11:18.142] [info] Using configuration file /home/matheus/.config/waybar/config.jsonc
[2026-09-05 09:11:18.146] [info] Including resource file: ./modules/backlight.jsonc
[2026-09-05 09:11:18.147] [debug] Try expanding: ./modules/backlight.jsonc
[2026-09-05 09:11:18.147] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/backlight.jsonc
[2026-09-05 09:11:18.147] [debug] Found config file: /home/matheus/.config/waybar/./modules/backlight.jsonc
[2026-09-05 09:11:18.147] [info] Including resource file: ./modules/battery.jsonc
[2026-09-05 09:11:18.147] [debug] Try expanding: ./modules/battery.jsonc
[2026-09-05 09:11:18.147] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/battery.jsonc
[2026-09-05 09:11:18.148] [debug] Found config file: /home/matheus/.config/waybar/./modules/battery.jsonc
[2026-09-05 09:11:18.148] [info] Including resource file: ./modules/clock.jsonc
[2026-09-05 09:11:18.148] [debug] Try expanding: ./modules/clock.jsonc
[2026-09-05 09:11:18.148] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/clock.jsonc
[2026-09-05 09:11:18.148] [debug] Found config file: /home/matheus/.config/waybar/./modules/clock.jsonc
[2026-09-05 09:11:18.148] [info] Including resource file: ./modules/cpu.jsonc
[2026-09-05 09:11:18.149] [debug] Try expanding: ./modules/cpu.jsonc
[2026-09-05 09:11:18.149] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/cpu.jsonc
[2026-09-05 09:11:18.149] [debug] Found config file: /home/matheus/.config/waybar/./modules/cpu.jsonc
[2026-09-05 09:11:18.149] [info] Including resource file: ./modules/custom.jsonc
[2026-09-05 09:11:18.149] [debug] Try expanding: ./modules/custom.jsonc
[2026-09-05 09:11:18.149] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/custom.jsonc
[2026-09-05 09:11:18.149] [debug] Found config file: /home/matheus/.config/waybar/./modules/custom.jsonc
[2026-09-05 09:11:18.149] [info] Including resource file: ./modules/disk.jsonc
[2026-09-05 09:11:18.149] [debug] Try expanding: ./modules/disk.jsonc
[2026-09-05 09:11:18.149] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/disk.jsonc
[2026-09-05 09:11:18.149] [debug] Found config file: /home/matheus/.config/waybar/./modules/disk.jsonc
[2026-09-05 09:11:18.150] [info] Including resource file: ./modules/hyprland.jsonc
[2026-09-05 09:11:18.150] [debug] Try expanding: ./modules/hyprland.jsonc
[2026-09-05 09:11:18.150] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/hyprland.jsonc
[2026-09-05 09:11:18.150] [debug] Found config file: /home/matheus/.config/waybar/./modules/hyprland.jsonc
[2026-09-05 09:11:18.150] [info] Including resource file: ./modules/keyboard-state.jsonc
[2026-09-05 09:11:18.150] [debug] Try expanding: ./modules/keyboard-state.jsonc
[2026-09-05 09:11:18.150] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/keyboard-state.jsonc
[2026-09-05 09:11:18.150] [debug] Found config file: /home/matheus/.config/waybar/./modules/keyboard-state.jsonc
[2026-09-05 09:11:18.150] [info] Including resource file: ./modules/memory.jsonc
[2026-09-05 09:11:18.150] [debug] Try expanding: ./modules/memory.jsonc
[2026-09-05 09:11:18.150] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/memory.jsonc
[2026-09-05 09:11:18.150] [debug] Found config file: /home/matheus/.config/waybar/./modules/memory.jsonc
[2026-09-05 09:11:18.151] [info] Including resource file: ./modules/network.jsonc
[2026-09-05 09:11:18.151] [debug] Try expanding: ./modules/network.jsonc
[2026-09-05 09:11:18.151] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/network.jsonc
[2026-09-05 09:11:18.151] [debug] Found config file: /home/matheus/.config/waybar/./modules/network.jsonc
[2026-09-05 09:11:18.151] [info] Including resource file: ./modules/privacy.jsonc
[2026-09-05 09:11:18.151] [debug] Try expanding: ./modules/privacy.jsonc
[2026-09-05 09:11:18.151] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/privacy.jsonc
[2026-09-05 09:11:18.152] [debug] Found config file: /home/matheus/.config/waybar/./modules/privacy.jsonc
[2026-09-05 09:11:18.152] [info] Including resource file: ./modules/systemd-failed-units.jsonc
[2026-09-05 09:11:18.152] [debug] Try expanding: ./modules/systemd-failed-units.jsonc
[2026-09-05 09:11:18.152] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/systemd-failed-units.jsonc
[2026-09-05 09:11:18.152] [debug] Found config file: /home/matheus/.config/waybar/./modules/systemd-failed-units.jsonc
[2026-09-05 09:11:18.153] [info] Including resource file: ./modules/temperature.jsonc
[2026-09-05 09:11:18.153] [debug] Try expanding: ./modules/temperature.jsonc
[2026-09-05 09:11:18.153] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/temperature.jsonc
[2026-09-05 09:11:18.153] [debug] Found config file: /home/matheus/.config/waybar/./modules/temperature.jsonc
[2026-09-05 09:11:18.153] [info] Including resource file: ./modules/tray.jsonc
[2026-09-05 09:11:18.153] [debug] Try expanding: ./modules/tray.jsonc
[2026-09-05 09:11:18.153] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/tray.jsonc
[2026-09-05 09:11:18.153] [debug] Found config file: /home/matheus/.config/waybar/./modules/tray.jsonc
[2026-09-05 09:11:18.154] [info] Including resource file: ./modules/wireplumber.jsonc
[2026-09-05 09:11:18.154] [debug] Try expanding: ./modules/wireplumber.jsonc
[2026-09-05 09:11:18.154] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/./modules/wireplumber.jsonc
[2026-09-05 09:11:18.154] [debug] Found config file: /home/matheus/.config/waybar/./modules/wireplumber.jsonc
[2026-09-05 09:11:18.158] [info] Discovered appearance 'dark'
[2026-09-05 09:11:18.189] [debug] Try expanding: $XDG_CONFIG_HOME/waybar/style-dark.css
[2026-09-05 09:11:18.189] [debug] Found config file: /home/matheus/.config/waybar/style-dark.css
[2026-09-05 09:11:18.189] [info] Using CSS file /home/matheus/.config/waybar/style-dark.css
[2026-09-05 09:11:18.191] [debug] Parsing imports for file: /home/matheus/.config/waybar/style-dark.css
[2026-09-05 09:11:18.192] [debug] Adding file to watch list: /usr/share/waybar-mechabar-git/themes/catppuccin-frappe.css
[2026-09-05 09:11:18.192] [debug] Adding file to watch list: /home/matheus/.config/waybar/style-dark.css
[2026-09-05 09:11:18.197] [debug] Output detection done: eDP-1 (BOE 0x0687 )
[2026-09-05 09:11:18.199] [info] Hyprland IPC starting
[2026-09-05 09:11:18.200] [debug] Initializing workspaces
[2026-09-05 09:11:18.201] [debug] Initializing persistent workspaces
[2026-09-05 09:11:18.201] [info] Loading persistent workspaces from Hyprland workspace rules
[2026-09-05 09:11:18.214] [debug] Cmd exited with code 0
[2026-09-05 09:11:18.219] [debug] [wireplumber]: preparing object manager: 'Audio/Source'
[2026-09-05 09:11:18.219] [debug] [wireplumber]: connecting to pipewire: 'Audio/Source'...
[2026-09-05 09:11:18.219] [debug] [wireplumber]: Audio/Source connected!
[2026-09-05 09:11:18.219] [debug] [wireplumber]: loading default nodes api module
[2026-09-05 09:11:18.221] [debug] [wireplumber]: preparing object manager: 'Audio/Sink'
[2026-09-05 09:11:18.221] [debug] [wireplumber]: connecting to pipewire: 'Audio/Sink'...
[2026-09-05 09:11:18.221] [debug] [wireplumber]: Audio/Sink connected!
[2026-09-05 09:11:18.221] [debug] [wireplumber]: loading default nodes api module
[2026-09-05 09:11:18.226] [debug] network: new default route via 192.168.178.1 on if3 metric 600
[2026-09-05 09:11:18.226] [debug] battery: worker interval is 2000
[2026-09-05 09:11:18.226] [debug] network: wlo1, new addr /0
[2026-09-05 09:11:18.226] [debug] network: wlo1, new addr /0
[2026-09-05 09:11:18.226] [debug] network: wlo1, new addr /0
[2026-09-05 09:11:18.226] [debug] network: wlo1, new addr /0
[2026-09-05 09:11:18.390] [info] Found device Razer Razer DeathAdder Essential at '/dev/input/event6'
[2026-09-05 09:11:18.437] [debug] Cmd exited with code 0
[2026-09-05 09:11:18.459] [info] Found device AT Translated Set 2 keyboard at '/dev/input/event3'
[2026-09-05 09:11:18.503] [debug] GTK widget tree:
window#waybar.background.top.eDP-1.main.mode-dock.solo.Alacritty:dir(ltr)
  decoration:dir(ltr)
  box.horizontal:dir(ltr)
    box.horizontal.modules-left:dir(ltr)
      widget:dir(ltr)
        box#workspaces.horizontal.module:dir(ltr)
      widget:dir(ltr)
        box#window.horizontal.module:dir(ltr)
          image:dir(ltr)
          label:dir(ltr)
    box.horizontal.modules-center:dir(ltr)
      widget:dir(ltr)
        label#systemd-failed-units.module:dir(ltr)
      widget:dir(ltr)
        label#custom-new-e-mails.module:dir(ltr)
      widget:dir(ltr)
        box#privacy.horizontal:dir(ltr)
          revealer:dir(ltr)
            box#privacy-item.horizontal.audio-in:dir(ltr)
              image:dir(ltr)
          revealer:dir(ltr)
            box#privacy-item.horizontal.audio-out:dir(ltr)
              image:dir(ltr)
          revealer:dir(ltr)
            box#privacy-item.horizontal.screenshare:dir(ltr)
              image:dir(ltr)
    box.horizontal.modules-right:dir(ltr)
      widget:dir(ltr)
        label#wireplumber.module.source:dir(ltr)
      widget:dir(ltr)
        label#wireplumber.module.sink:dir(ltr)
      widget:dir(ltr)
        label#backlight.module:dir(ltr)
      widget:dir(ltr)
        label#disk.module:dir(ltr)
      widget:dir(ltr)
        label#cpu.module:dir(ltr)
      widget:dir(ltr)
        label#temperature.module:dir(ltr)
      widget:dir(ltr)
        label#memory.module:dir(ltr)
      widget:dir(ltr)
        label#network.module:dir(ltr)
      widget:dir(ltr)
        label#battery.module:dir(ltr)
      widget:dir(ltr)
        box#keyboard-state.horizontal.module:dir(ltr)
          label.scrolllock:dir(ltr)
          label.capslock:dir(ltr)
          label.numlock:dir(ltr)
      widget:dir(ltr)
        label#clock.module:dir(ltr)
      widget:dir(ltr)
        box#tray.horizontal.module:dir(ltr)

[2026-09-05 09:11:18.504] [debug] Creating workspace 1
[2026-09-05 09:11:18.510] [debug] Creating workspace 10
[2026-09-05 09:11:18.512] [debug] Creating workspace 9
[2026-09-05 09:11:18.513] [debug] Creating workspace 2
[2026-09-05 09:11:18.514] [debug] Creating workspace 3
[2026-09-05 09:11:18.534] [debug] Received SIGCHLD in signalThread
[2026-09-05 09:11:18.534] [debug] Received SIGCHLD in signalThread
Full

** (waybar:131625): WARNING **: 09:11:18.651: Status Notifier Item with bus name ':1.14' and object path '/org/ayatana/NotificationItem/nm_applet' is already registered
[2026-09-05 09:11:18.705] [debug] Received SIGCHLD in signalThread
[2026-09-05 09:11:18.705] [debug] SNI tray id: nm-applet
[2026-09-05 09:11:18.705] [debug] hyprland IPC received openlayer>>main
[2026-09-05 09:11:18.735] [debug] [wireplumber]: callback loading default node api module
[2026-09-05 09:11:18.735] [debug] [wireplumber]: loaded default nodes api
[2026-09-05 09:11:18.735] [debug] [wireplumber]: loading mixer api module
[2026-09-05 09:11:18.735] [debug] [wireplumber]: callback loading default node api module
[2026-09-05 09:11:18.735] [debug] [wireplumber]: loaded default nodes api
[2026-09-05 09:11:18.735] [debug] [wireplumber]: loading mixer api module
[2026-09-05 09:11:18.738] [debug] [wireplumber]: loaded mixer API
[2026-09-05 09:11:18.738] [debug] [wireplumber]: activating plugins
[2026-09-05 09:11:18.738] [debug] [wireplumber]: onPluginActivated: mixer-api
[2026-09-05 09:11:18.738] [debug] [wireplumber]: loaded mixer API
[2026-09-05 09:11:18.738] [debug] [wireplumber]: activating plugins
[2026-09-05 09:11:18.738] [debug] [wireplumber]: onPluginActivated: mixer-api
[2026-09-05 09:11:18.741] [debug] [wireplumber]: onPluginActivated: default-nodes-api
[2026-09-05 09:11:18.741] [debug] [wireplumber]: onPluginActivated: default-nodes-api
[2026-09-05 09:11:18.742] [debug] [wireplumber]: onObjectManagerInstalled
[2026-09-05 09:11:18.742] [debug] [wireplumber]: updating volume
[2026-09-05 09:11:18.742] [debug] [wireplumber]: updating 'Audio/Source' node name with node.id 59
[2026-09-05 09:11:18.742] [debug] [wireplumber]: Updating 'Audio/Source' node name to: ALC236 Analog
[2026-09-05 09:11:18.742] [debug] [wireplumber]: updating source volume
[2026-09-05 09:11:18.742] [debug] [wireplumber]: updating source name with node.id 59
[2026-09-05 09:11:18.742] [debug] [wireplumber]: Updating source name to: ALC236 Analog
[2026-09-05 09:11:18.742] [debug] [wireplumber]: onObjectManagerInstalled
[2026-09-05 09:11:18.742] [debug] [wireplumber]: updating volume
[2026-09-05 09:11:18.742] [debug] [wireplumber]: updating 'Audio/Sink' node name with node.id 58
[2026-09-05 09:11:18.742] [debug] [wireplumber]: Updating 'Audio/Sink' node name to: ALC236 Analog
[2026-09-05 09:11:18.742] [debug] [wireplumber]: updating source volume
[2026-09-05 09:11:18.742] [debug] [wireplumber]: updating source name with node.id 59
[2026-09-05 09:11:18.742] [debug] [wireplumber]: Updating source name to: ALC236 Analog
Full

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