Riddle me this: unsolicited orderly shutdown

[borissh1983 at gmail.com]

On Friday, 12 March 2021 12:17:26 IST Shachar Shemesh wrote:


Allow me, if I may, to set up the stage for you. 
I don't know the precise scenario that causes this to happen, but one thing that triggers it reliably is starting up X-Plane 11 and taking off. A few second and up to a minute into the flight, my KDE "shutting down" screen comes up. If I cancel the shutdown, the screen comes up one more time on its own, and then the computer just shuts down. 
Now, I know what you're all thinking. So I ran X-Plane while monitoring the CPU's and GPU's temperatures. Sure enough, they get hot. I opened up the laptop (Dell XPS 15, a gamer's laptop), cleaned the fans, and ran the game again. Temperatures were much more reasonable. But the shutdown screen popped up again. 
I ran it with dmesg running. While there are some temperature throttling messages, not a lot, and none that claim I *have* to shut down. 
I am looking for a way to debug this. Obviously, something in the hardware gives the command to shut down the computer. I have, however, not been able to find out what and why. 
Does anyone have any idea which system might be issuing this command, and where it might be writing its logs? 
Shachar




Would it be possible to monitor both dbus messages (system and user) AND Xsession errors while you do so ? 

It could be that you have some tool (something like TLP that might trigger a shutdown script when you hit a threashold ) .

If I were you I would also check for messages such as "temperature reached" in syslog, the temp values may be set both in the UEFI and on kernel level. 
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