[Unit]
Description=NVIDIA Fan Control on Wayland Arch
After=graphical-session.target
[Service]
ExecStart=sudo /home/rob/Documents/fan.sh
User=root
[Install]
WantedBy=default.target
● fan.service - NVIDIA Fan Control on Wayland Arch
Loaded: loaded (/etc/systemd/system/fan.service; enabled; preset: disabled)
Active: active (running) since Tue 2023-10-17 18:29:39 EDT; 4s ago
Main PID: 2691 (sudo)
Tasks: 3 (limit: 38401)
Memory: 5.9M
CPU: 39ms
CGroup: /system.slice/fan.service
├─2691 sudo /home/rob/Documents/fan.sh
├─2692 /bin/bash /home/rob/Documents/fan.sh
└─2699 sleep 5
Oct 17 18:29:39 robpc systemd[1]: Started NVIDIA Fan Control on Wayland Arch.
Oct 17 18:29:39 robpc sudo[2691]: root : PWD=/ ; USER=root ; COMMAND=/home/rob/Documents/fan.sh
Oct 17 18:29:39 robpc sudo[2691]: pam_unix(sudo:session): session opened for user root(uid=0) by (uid=0)
Oct 17 18:29:39 robpc sudo[2694]: ERROR: The control display is undefined; please run `nvidia-settings --help` for usage information.
Oct 17 18:29:39 robpc sudo[2692]: Current GPU temperature: 0
Oct 17 18:29:39 robpc sudo[2698]: ERROR: The control display is undefined; please run `nvidia-settings --help` for usage information.
The output here lets us know that systemd is running the service file and starting the script just fine. The echoed GPU temperature is making it to the journal, but the gpuTemp variable isn't being updated (staying at 0) because of a problem executing nvidia-settings. Specifically, it wants a display: "The control display is undefined".
Although if echo DISPLAY in your terminal gives you a different value, use that. There's a possibility that that will just push one error further down the line, but it's something to try.
Alternatively/additionally, you could try changing the User= line to your own username to see if it picks up the environment your manual executions work with.
the reason for more than one elif is for different package managers like apt, yum and dnf, other than that it just skips it if the package is detected.
Afaik it uses cli to find the temperature. i couldnt set the temperature with nvidia-smi so i had to use nvidia-settings
Yes the loop is nice, but you know your packagemanager and that this package will not disappear randomly, so keep it out of this service script, its just an extra break point and wastes resources :D
As soon as I get home I'll do it. Afaik if you try to run it normally without root access it spits out errors about not being able to set the fan speed because it uses nvidia-settings as a dependancy. Also failed to mention this is a Wayland script, not xorg