Service fails to start upon waking up from sleep

[mdujovic17]

deepcool-digital.service as it is currently provided in README fails to start when waking up from a suspended state, such as sleep.

The following log is generated upon waking up:

Oct 22 14:56:37 workstation-pc systemd[1]: Started deepcool-digital.service - DeepCool Digital CPU Monitor.
Oct 22 14:56:37 workstation-pc deepcool-digital-linux[19117]: --- Deepcool Digital Linux ---
Oct 22 14:56:37 workstation-pc deepcool-digital-linux[19117]: CPU MON.: AMD Ryzen 7 5800X 8-Core Processor
Oct 22 14:56:37 workstation-pc deepcool-digital-linux[19117]: GPU MON.: none
Oct 22 14:56:37 workstation-pc deepcool-digital-linux[19117]: -----
Oct 22 14:56:37 workstation-pc deepcool-digital-linux[19117]: Error! No DeepCool device was found
Oct 22 14:56:37 workstation-pc systemd[1]: deepcool-digital.service: Main process exited, code=exited, status=1/FAILURE
Oct 22 14:56:37 workstation-pc systemd[1]: deepcool-digital.service: Failed with result 'exit-code'.

One solution that worked for me is to add StartLimitIntervalSec, StartLimitBurst and Restart=on-failure to the service. With this, the service usually starts after 1 service restart.

To clarify, I'm using another service to 'start' the service after waking up:

[Unit]
Description=Restarts DeepCool Digital service after waking up from suspended state
After=sleep.target
After=suspend.target
After=hibernate.target

[Service]
Type=oneshot
ExecStart=/bin/systemctl --no-block restart deepcool-digital.service

[Install]
WantedBy=sleep.target
WantedBy=suspend.target
WantedBy=hibernate.target

[Nortank12]

I'm using the same service without issues. Did you have any specific problems using the provided service, or did you initially use a separate service after waking up?

[mdujovic17]

I'm using the one provided in readme as a startup service when the PC powers on, but it doesn't work for waking up from suspend-to-ram or suspend-to-idle, so I added the one above to restart the original service.

[Nortank12]

Which distribution are you using? It could be related to that, or a specific program or service may be interrupting it when your PC wakes up.

[Nortank12]

I was thinking if adding a Restart parameter to the original service would solve the issue:

[Service]
ExecStart=/usr/sbin/deepcool-digital-linux
Restart=on-failure
RestartSec=5s

Could you try that and update me whether it worked?

[mdujovic17]

I'm already using Restart=on-failure inside the original service, even before the helper service it did not work. In my case, problem with this is that before the PC enters sleep, following happens:

The first error code 101 happens as soon as I press the sleep button, after that the service seems to be killed and won't start up again unless I manually start it, or through a helper service.

The second error code 1 happens as soon as as the helper service restarts the original service, but it only happens the first time, and since I'm using StartLimitBurst , 2nd start attempt succeeds.

Also this happened across multiple distros for me: Fedora, Debian and OpenSUSE Tumbleweed

Info on my system:

• Fedora KDE 43
• AMD Ryzen 5800X
• 32GB RAM
• Intel Arc A750
• Gigabyte B550 MB

[Nortank12]

So it looks like the device shuts down before the program on suspend, which makes it panic, and even if you provide a restart policy, it won't start again.

I'm not sure why it's happening, but I'm keeping this issue open in case someone experiences a similar problem.