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Laptop uptime - since suspend (feddit.uk)
submitted 7 months ago by to c/linux@lemmy.world
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Just been supporting someone remotely and was waiting for them to turn on their laptop...

Whilst troubleshooting I ran uptime to see how long we'd been working on the problem and saw it was up for ~2 weeks...

Which made me think ... how do you tell how long a device (laptop) has been running, but since it's last suspend / hibernation?

I can find it from other clues such as journalctl -b -fu systemd-logind and look for Lid opened, but I was really looking for an smarter way...

Just a nice little challenge for anyone bored at this time of year :)

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[–] 8 points 7 months ago* (1 child) 
journalctl --list-boots

If you see multiple entries without reboots, those intermediate boundaries are suspend/resume cycles.

you can get the last resupe time with either

journalctl -b -1 -g "PM: suspend exit"

or maybe

journalctl -g "resume from suspend"

I don't have my laptop with me rn, so it would be nice if somebody can confirm whether this works

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  • [–] [S] 2 points 7 months ago

    Thanks, yeah, it looks like the journal is the main way.

    I was also trying last and who, but they didn't help

    And I was hoping there would be an easy systemd approach

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