What is best method to use scroll lock to show hdd activity?

Issues & Assistance
1

My Mini pc does not show HDD activity…I looked at hard drive widgets but couldn’t find any that just gave a simple blinking light for r/w. I searched and found various methods to use the scroll lock, caps lock etc for hdd lights but apparently they are outdated as none of the ones I found worked. Thanks!

System:
  Kernel: 6.12.0-rc6-1-mainline-x64v3 arch: x86_64 bits: 64 compiler: gcc v: 14.2.1
    clocksource: tsc avail: acpi_pm parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-mainline-x64v3
    root=UUID=5ad7fecd-1a14-4590-8ce1-42685c5ee6c8 rw rootflags=subvol=@ quiet
    rd.luks.uuid=2bdec0d6-999c-4a5a-9278-70a5c8e236d9 loglevel=3 ibt=off
  Desktop: KDE Plasma v: 6.2.2 tk: Qt v: N/A info: frameworks v: 6.7.0 wm: kwin_wayland
    with: krunner vt: 1 dm: SDDM Distro: Garuda base: Arch Linux
Machine:
  Type: Desktop Mobo: N/A model: N/A serial: <superuser required> uuid: <superuser required>
    UEFI: American Megatrends LLC. v: AM08Pro_P5C5V19 date: 09/20/2023
Battery:
  Device-1: hidpp_battery_2 model: Logitech M570 serial: <filter> charge: 95% rechargeable: yes
    status: discharging
CPU:
  Info: model: AMD Ryzen 7 7735HS with Radeon Graphics bits: 64 type: MT MCP arch: Zen 3+ gen: 3
    level: v3 note: check built: 2022 process: TSMC n6 (7nm) family: 0x19 (25) model-id: 0x44 (68)
    stepping: 1 microcode: 0xA404102
  Topology: cpus: 1x dies: 1 clusters: 1 cores: 8 threads: 16 tpc: 2 smt: enabled cache:
    L1: 512 KiB desc: d-8x32 KiB; i-8x32 KiB L2: 4 MiB desc: 8x512 KiB L3: 16 MiB desc: 1x16 MiB
  Speed (MHz): avg: 4018 min/max: 400/4829 boost: enabled scaling: driver: amd-pstate-epp
    governor: powersave cores: 1: 4018 2: 4018 3: 4018 4: 4018 5: 4018 6: 4018 7: 4018 8: 4018
    9: 4018 10: 4018 11: 4018 12: 4018 13: 4018 14: 4018 15: 4018 16: 4018 bogomips: 102267
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
  Vulnerabilities: <filter>
Graphics:
  Device-1: Advanced Micro Devices [AMD/ATI] Rembrandt [Radeon 680M] driver: amdgpu v: kernel
    arch: RDNA-2 code: Navi-2x process: TSMC n7 (7nm) built: 2020-22 pcie: gen: 4 speed: 16 GT/s
    lanes: 16 ports: active: HDMI-A-1 empty: DP-1, DP-2, DP-3, DP-4, DP-5, HDMI-A-2, Writeback-1
    bus-ID: e5:00.0 chip-ID: 1002:1681 class-ID: 0300 temp: 64.0 C
  Device-2: Sunplus Innovation Full HD webcam driver: snd-usb-audio,uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 3-1.1.4.2:13 chip-ID: 1bcf:2284 class-ID: 0102
    serial: <filter>
  Display: wayland server: X.org v: 1.21.1.14 with: Xwayland v: 24.1.4 compositor: kwin_wayland
    driver: X: loaded: amdgpu unloaded: modesetting alternate: fbdev,vesa dri: radeonsi gpu: amdgpu
    display-ID: 0
  Monitor-1: HDMI-A-1 res: 2752x1152 size: N/A modes: N/A
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi device: 1 drv: swrast
    gbm: drv: kms_swrast surfaceless: drv: radeonsi wayland: drv: radeonsi x11: drv: radeonsi
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 24.2.6-arch1.1 glx-v: 1.4
    direct-render: yes renderer: AMD Radeon 680M (radeonsi rembrandt LLVM 18.1.8 DRM 3.59
    6.12.0-rc6-1-mainline-x64v3) device-ID: 1002:1681 memory: 3.91 GiB unified: no display-ID: :1.0
  API: Vulkan v: 1.3.295 layers: 3 device: 0 type: integrated-gpu name: AMD Radeon 680M (RADV
    REMBRANDT) driver: mesa radv v: 24.2.6-arch1.1 device-ID: 1002:1681 surfaces: xcb,xlib,wayland
    device: 1 type: cpu name: llvmpipe (LLVM 18.1.8 256 bits) driver: mesa llvmpipe
    v: 24.2.6-arch1.1 (LLVM 18.1.8) device-ID: 10005:0000 surfaces: xcb,xlib,wayland
Audio:
  Device-1: Advanced Micro Devices [AMD/ATI] Rembrandt Radeon High Definition Audio
    driver: snd_hda_intel v: kernel pcie: gen: 4 speed: 16 GT/s lanes: 16 bus-ID: e5:00.1
    chip-ID: 1002:1640 class-ID: 0403
  Device-2: Advanced Micro Devices [AMD] ACP/ACP3X/ACP6x Audio Coprocessor driver: snd_pci_acp6x
    v: kernel alternate: snd_pci_acp3x, snd_rn_pci_acp3x, snd_pci_acp5x, snd_acp_pci,
    snd_rpl_pci_acp6x, snd_pci_ps, snd_sof_amd_renoir, snd_sof_amd_rembrandt, snd_sof_amd_vangogh,
    snd_sof_amd_acp63 pcie: gen: 4 speed: 16 GT/s lanes: 16 bus-ID: e5:00.5 chip-ID: 1022:15e2
    class-ID: 0480
  Device-3: Advanced Micro Devices [AMD] Family 17h/19h HD Audio driver: snd_hda_intel v: kernel
    pcie: gen: 4 speed: 16 GT/s lanes: 16 bus-ID: e5:00.6 chip-ID: 1022:15e3 class-ID: 0403
  Device-4: Sunplus I
nnovation Full HD webcam driver: snd-usb-audio,uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 3-1.1.4.2:13 chip-ID: 1bcf:2284 class-ID: 0102
    serial: <filter>
  API: ALSA v: k6.12.0-rc6-1-mainline-x64v3 status: kernel-api tools: N/A
  Server-1: PipeWire v: 1.2.6 status: active with: 1: pipewire-pulse status: active
    2: wireplumber status: active 3: pipewire-alsa type: plugin 4: pw-jack type: plugin
    tools: pactl,pw-cat,pw-cli,wpctl
Network:
  Device-1: Realtek RTL8125 2.5GbE driver: r8169 v: kernel pcie: gen: 2 speed: 5 GT/s lanes: 1
    port: f000 bus-ID: 02:00.0 chip-ID: 10ec:8125 class-ID: 0200
  IF: enp2s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
  Device-2: Realtek RTL8852BE PCIe 802.11ax Wireless Network driver: rtw89_8852be v: kernel pcie:
    gen: 1 speed: 2.5 GT/s lanes: 1 port: e000 bus-ID: 03:00.0 chip-ID: 10ec:b852 class-ID: 0280
  IF: wlp3s0 state: down mac: <filter>
  Info: services: NetworkManager, smbd, sshd, systemd-timesyncd, wpa_supplicant
Bluetooth:
  Device-1: Realtek Bluetooth Radio driver: btusb v: 0.8 type: USB rev: 1.0 speed: 12 Mb/s lanes: 1
    mode: 1.1 bus-ID: 3-3:3 chip-ID: 0bda:b85b class-ID: e001 serial: <filter>
  Report: btmgmt ID: hci0 rfk-id: 0 state: up address: <filter> bt-v: 5.2 lmp-v: 11 status:
    discoverable: no pairing: no class-ID: 6c0104
Drives:
  Local Storage: total: 2.77 TiB used: 276.16 GiB (9.7%)
  SMART Message: Unable to run smartctl. Root privileges required.
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Intel model: SSDPEKNU020TZ size: 1.86 TiB block-size:
    physical: 512 B logical: 512 B speed: 31.6 Gb/s lanes: 4 tech: SSD serial: <filter> fw-rev: 003C
    temp: 71.8 C scheme: GPT
  ID-2: /dev/sda maj-min: 8:0 vendor: Crucial model: CT1000MX500SSD1 size: 931.51 GiB block-size:
    physical: 4096 B logical: 512 B speed: 6.0 Gb/s tech: SSD serial: <filter> fw-rev: 043
    scheme: GPT
Partition:
  ID-1: / raw-size: 1.86 TiB size: 1.86 TiB (100.00%) used: 276.16 GiB (14.5%) fs: btrfs
    dev: /dev/dm-0 maj-min: 254:0 mapped: luks-2bdec0d6-999c-4a5a-9278-70a5c8e236d9
  ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%) used: 728 KiB (0.2%) fs: vfat
    dev: /dev/nvme0n1p1 maj-min: 259:1
  ID-3: /home raw-size: 1.86 TiB size: 1.86 TiB (100.00%) used: 276.16 GiB (14.5%) fs: btrfs
    dev: /dev/dm-0 maj-min: 254:0 mapped: luks-2bdec0d6-999c-4a5a-9278-70a5c8e236d9
  ID-4: /var/log raw-size: 1.86 TiB size: 1.86 TiB (100.00%) used: 276.16 GiB (14.5%) fs: btrfs
    dev: /dev/dm-0 maj-min: 254:0 mapped: luks-2bdec0d6-999c-4a5a-9278-70a5c8e236d9
  ID-5: /var/tmp raw-size: 1.86 TiB size: 1.86 TiB (100.00%) used: 276.16 GiB (14.5%) fs: btrfs
    dev: /dev/dm-0 maj-min: 254:0 mapped: luks-2bdec0d6-999c-4a5a-9278-70a5c8e236d9
Swap:
  Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default) zswap: no
  ID-1: swap-1 type: zram size: 27.15 GiB used: 7.61 GiB (28.0%) priority: 100 comp: lzo-rle
    avail: lzo max-streams: 16 dev: /dev/zram0
Sensors:
  System Temperatures: cpu: 73.2 C mobo: 65.5 C gpu: amdgpu temp: 63.0 C
  Fan Speeds (rpm): N/A
Info:
  Memory: total: 28 GiB available: 27.15 GiB used: 14.66 GiB (54.0%)
  Processes: 486 Power: uptime: 14h 16m states: freeze,mem,disk suspend: s2idle avail: deep
    wakeups: 0 hibernate: platform avail: shutdown, reboot, suspend, test_resume image: 10.85 GiB
    services: org_kde_powerdevil, power-profiles-daemon, upowerd Init: systemd v: 256
    default: graphical tool: systemctl
  Packages: 1561 pm: pacman pkgs: 1556 libs: 397 tools: octopi,paru pm: flatpak pkgs: 5
    Compilers: gcc: 14.2.1 Client: shell wrapper v: 5.2.37-release inxi: 3.3.36
Garuda (2.6.26-1):
  System install date:     2024-09-26
  Last full system update: 2024-11-05 ↻
  Is partially upgraded:   No
  Relevant software:       snapper NetworkManager dracut
  Windows dual boot:       Probably (Run as root to verify)
  Failed units:            archlinux-keyring-wkd-sync.service
2

Answering my own question(must be ran as root):
/usr/local/bin/hdled.sh

#!/bin/bash

# Check interval seconds
VMSTAT_INTERVAL=0.1

# Console output device
CONSOLE=/dev/console

# Indicator for LED control (caps, num, scroll)
INDICATOR="scroll"

# Function to get vmstat data and print it
getVmstat() {
  cat /proc/vmstat | grep -E "pgpgin|pgpgout" 
}

# Turn the LED on
function led_on() {
    setleds -L +${INDICATOR} < ${CONSOLE}
}

# Turn the LED off
function led_off() {
    setleds -L -${INDICATOR} < ${CONSOLE}
}

# Initialize variables
NEW=$(getVmstat)
OLD=$(getVmstat)

while [ 1 ] ; do
  sleep $VMSTAT_INTERVAL # Slow down a bit
  NEW=$(getVmstat)
  if [ "$NEW" = "$OLD" ]; then
    led_off ## No change, LED off
  else
    led_on  ## Change detected, LED on 
  fi
  OLD=$NEW
done

Systemd Service file (/etc/systemd/system/hdled.service)

[Unit]
Description=Keyboard HD LED
Wants=network.target
After=syslog.target network-online.target

[Service]
Type=simple
ExecStart=/usr/local/bin/hdled.sh
Restart=on-failure
RestartSec=10
KillMode=process

[Install]
WantedBy=multi-user.target
3

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