[Unit]
Description=Disable Power Management Features
After=sysinit.target

[Service]
Type=oneshot
# Disable PCIe ASPM
ExecStart=/bin/sh -c 'echo performance > /sys/module/pcie_aspm/parameters/policy || true'
# Disable USB autosuspend
ExecStart=/bin/sh -c 'for i in /sys/bus/usb/devices/*/power/autosuspend; do echo -1 > $i 2>/dev/null || true; done'
# Disable SATA link power management
ExecStart=/bin/sh -c 'for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo max_performance > $i 2>/dev/null || true; done'
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target