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I'm running a system (Fedora 27) which often freezes completely when I've been away from the computer for a while. As I am running computation in the background, I can tell that the freeze happens anywhere from minutes to hours after I've locked the computer. The computer is running, but is otherwise completely unresponsive (screen doesn't turn on, num lock on keyboard does nothing, etc).

Where would I start to debug this? What log files might help me figure out what the problem is? The computer never freezes while I'm working at it, which obviously makes me suspect that it's related to GDM turning the screen off,but I'm unable to find other people with similar problems.

  • Try this when it gets unresponsive:- Close the lid wait for 5 seconds and then open the lid. It will bring the gdm login screen. – Arpit Agarwal Dec 7 '17 at 9:00
  • Tricky, as it's a desktop ;) That being said, after turning it off, it does usually need somehting like 20s before I can turn it on again. – LKlevin Dec 7 '17 at 9:58
  • Can you access the TTY screens (Alt-Ctrl-F1 ... Alft-Ctrl-F6) and login there? – xenoid Dec 7 '17 at 11:00
  • No, completely unresponsive. Screens are turned off, none of the standard keyboard shortcuts work (Alt-Ctrl-F1 , Alt-Ctrl-Backspace, shortpressing the power button). – LKlevin Dec 7 '17 at 11:44
  • Does it respond to a ssh from another machine? – Roflo Dec 7 '17 at 22:31
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Both software and hardware failure may be a reason behind the system freezing issue. I'll suggest to diagnose step-wise.

To, check any software issue in this situation easiest way to boot the system using a live disk like Ubntu etc and check whether the issue is still exists. If, the issue is persistent with live disk also it's mostly a hardware issue.

If your system is working fine with live disk, login back to your installed system and check xorg log file usually in /var/log/Xorg.0.log [Replace 0 with other numbers for older logs]. Probably you'll find some insight there. Also check the system's power environment i.e. sleep time, hibernation time etc in current installation.

Press alt+f2 to login into tty instead GUI and check whether the issue is still exists or not. If the issue doesn't appear in tty it may be a display driver issue.

Also ensure any random key from keyboard is pressing due to hardware fault. Open a terminal and type xev while logged into GUI. This will show all input key stock and mouse movement.

Also ensure any cable loose connection in case your mentioned system is a desktop.

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