Reset Sound Blaster G6 microphone on Linux after reboot via systemd

audio-config-sbg6.service

[Unit]
Description=Sound BlasterX G6 Audio Configuration
After=graphical.target sound.target alsa-restore.service pulseaudio.service pipewire.service
# Wait for everything to be fully ready
After=multi-user.target network.target

[Service]
Type=oneshot
ExecStartPre=/bin/sleep 10
ExecStart=/usr/local/bin/reset_sound_blaster_g6.sh
RemainAfterExit=yes
Restart=on-failure
RestartSec=5s
User=root

# Logging configuration
StandardOutput=journal
StandardError=journal
SyslogIdentifier=audio-config

[Install]
WantedBy=multi-user.target

reset_sound_blaster_g6.sh

#!/bin/bash
set -euo pipefail

# Script configuration
readonly SCRIPT_NAME="$(basename "$0")"
readonly DEVICE_NAME="Sound BlasterX G6"
readonly USB_DEVICE_ID="041e:3256"
readonly INITIAL_SLEEP=1
readonly USB_RESET_SLEEP=2

# Logging functions
log_info() {
    echo "[INFO] $*"
}

log_error() {
    echo "[ERROR] $*" >&2
}

log_warn() {
    echo "[WARN] $*" >&2
}

log_debug() {
    echo "[DEBUG] $*"
}

# Main script
main() {
    log_info "Starting audio device configuration for ${DEVICE_NAME}"

    # Initial delay
    log_debug "Waiting ${INITIAL_SLEEP}s for system initialization"
    sleep "$INITIAL_SLEEP"

    # Find sound card
    log_info "Searching for sound card: ${DEVICE_NAME}"
    local aplay_output
    if ! aplay_output=$(aplay -l 2>&1); then
        log_error "Failed to list audio devices"
        log_debug "aplay output: ${aplay_output}"
        return 1
    fi

    local card_number
    card_number=$(echo "$aplay_output" | grep "$DEVICE_NAME" | cut -d' ' -f 2 | tr -d ':' || true)

    if [[ -z "$card_number" ]]; then
        log_error "Sound card '${DEVICE_NAME}' not found"
        log_debug "Available devices:"
        echo "$aplay_output" | grep -E "^card" >&2 || log_debug "No cards found"
        return 1
    fi

    log_info "Found sound card at card${card_number}"

    # Reset USB device
    log_info "Resetting USB device ${USB_DEVICE_ID}"
    if ! usbreset "$USB_DEVICE_ID" 2>&1; then
        log_error "Failed to reset USB device ${USB_DEVICE_ID}"
        log_warn "Continuing anyway..."
    else
        log_info "USB device reset successful"
    fi

    # Wait for device to reinitialize
    log_debug "Waiting ${USB_RESET_SLEEP}s for device reinitialization"
    sleep "$USB_RESET_SLEEP"

    # Verify card still exists after reset
    log_debug "Verifying card${card_number} is available after reset"
    if ! aplay -l 2>&1 | grep -q "card ${card_number}"; then
        log_error "Card${card_number} disappeared after USB reset"
        return 1
    fi

    # Configure audio settings
    log_info "Configuring audio settings for card${card_number}"

    # Set PCM Capture Source
    log_debug "Setting PCM Capture Source to 'External Mic'"
    if ! amixer -c "$card_number" set 'PCM Capture Source' 'External Mic' 2>&1; then
        log_error "Failed to set PCM Capture Source"
        return 1
    fi

    # Enable and set External Mic to 100%
    log_debug "Setting External Mic capture to 100%"
    if ! amixer -c "$card_number" set 'External Mic' cap 100% 2>&1; then
        log_error "Failed to configure External Mic"
        return 1
    fi

    # Set Input Gain Control to 67%
    log_debug "Setting Input Gain Control to 67%"
    if ! amixer -c "$card_number" set 'Input Gain Control' cap 67% 2>&1; then
        log_error "Failed to set Input Gain Control"
        return 1
    fi

    log_info "Audio configuration completed successfully"

    # Display final mixer state
    log_debug "Current mixer state:"
    amixer -c "$card_number" scontents 2>&1 | grep -A 5 -E "(External Mic|PCM Capture|Input Gain)" || true

    return 0
}

# Execute main function
if main; then
    log_info "${SCRIPT_NAME} completed successfully"
    exit 0
else
    log_error "${SCRIPT_NAME} failed"
    exit 1
fi