Add systemd service file for applying on boot.

README.md

@@ -16,6 +16,9 @@ a device (e.g. L0s, L0sL1 or L1).
 sudo autoaspm.py
 ```
 
+#### Automatially apply on boot
+Copy the `auto-aspm.service` systemd service file into the `/etc/systemd/system/`-directory. Edit the file and change the `WorkingDirectory` to the directory where you have saved the `autoaspm.py` file and replace the path to the python3 interpreter and the path to the script on the `ExecStart` line. Once that is done, run `systemctl daemon-reload` to update systemd service definitions and then run `systemctl enable auto-aspm.service` to run the script on boot or `systemctl enable --now auto-aspm.service` to run now and on boot.
+
 ### Credits
 
 - Luis R. Rodriguez for writing the original enable_aspm script:

auto-aspm.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=Run the autoaspm.py script to enable supported ASPM levels for PCIe devices.
+
+[Service]
+User=root
+WorkingDirectory=/root/
+ExecStart=/usr/bin/python3 /root/autoaspm.py
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target