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Old 04-20-2017, 06:22 AM   #1
Rawing
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Registered: Apr 2017
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PC occasionally fails to suspend (fans stay on)


Usually (~90% of the time) my PC suspends just fine. But sometimes it does a sort of incomplete suspend, leaving the fans turned on. I've tried waiting, but half an hour later the fans were still running.

I'm currently using Fedora 25, but I've had this problem for about a year now, and I've also experienced it on other distros like Arch. I've also reinstalled both systems multiple times, yet the problem still persists.
My google searches have so far been fruitless. The usual advice is to take a look at the /var/log/pm-suspend.log log file, but that file does not exist on my system.

What can I do to diagnose this problem?


Additional details and observations:
*) I usually suspend my PC using the suspend button on my keyboard. I've noticed that the problem occurs far less frequently if I suspend with the command "systemctl suspend" instead.
*) Usually when my PC is in this odd "semi-suspended" state, I can wake it up by pressing the power button (on the PC case, not the suspend button on my keyboard). Sometimes, however, instead of resuming from suspend, this makes my PC boot. It's as if the PC was turned off, but with the fans turned on. Because of this, I risk losing all unsaved data every time I suspend my PC.
 
Old 04-20-2017, 11:50 AM   #2
tronayne
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That sounds an awful lot like motherboard (possibly a leaking capacitor).

Have you experienced turning on the system and the fans go full blast and stay there? That would pretty much be motherboard.

Maybe find a local guy and have it checked out.

If, before you hit the suspend button, you sync the system that will flush any unsaved files to disk. You can use this to do that:
Code:
sync;sync;sync
It will not hurt to sync three times and may save you a lot of trouble. But I'd get the box to a service guy and see what may be wrong (no, the fans should not keep running).

Hope this helps some.
 
Old 04-20-2017, 12:13 PM   #3
Rawing
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Thanks for the input. I assumed this was a software problem because it seems to be a fairly common issue and it never happens when I use Windows, but you may be right. I haven't had any other fan related problems, but there have been bad experiences with my brand of motherboard in the past. Maybe it's time to get a replacement.
 
Old 04-21-2017, 06:08 AM   #4
tronayne
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Just maybe, have you cleaned out the dust? Goofy things happen if there's a layer of dust that can become conductive. Check your temps and see, too. I have no idea what software might be causing it but a good cleaning might be a good thing. I blew out one of my servers a few days ago and watched dust and Labrador hair fly out of everywhere. Took it outside and used my compressor. That particular box was way overdue for cleaning (so are the other three, that's today's little janitorial task).

I really don't know a good (or bad) reason for your condition (or why Windows would work and Linux not work). But I'd try blowing the thing out and see what you get. Other than that rebuilt motherboards are pretty inexpensive (last one I did was $50 -- it had the power on fans at full blast problem).

Anyway, best of luck.
 
  


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