Chassis/Host power control and power state transition

Andrew Geissler geissonator at
Fri Jan 3 01:24:23 AEDT 2020

> On Dec 20, 2019, at 3:03 AM, rgrs <rgrs at> wrote:
> Hi All,
> Sometimes when I do "ipmitool chassis power cycle",  system gets powered off but not powered on back again.
> Logs show some sd_bus_set_property returns errno 5 (Input/Output error).
> My guess is that CPLD that takes care of power distribution  in my server is causing the IO error, but i need enough data/logs to prove it.
> I'm not able to debug further without understanding the state machine, system targets, and their order of execution.
> Is there any docs to tools to help me understand or visualize the execution sequence (for power operations atleast)? and are
good places to start.

Unfortunately we have not had a lot of luck with visualization. I have an issue,, to look into doing something
with systemd-analyze but haven’t made much progress.

Usually when debugging failed systemd services, systemctl and journalctl
are going to be your debug tools.


> Thanks,
> Raj

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