Random suspend when working

[KeithG]

I have seen this with 15.10 and now with 16.04. Am running a fresh/clean install 16.04LTS (not upgraded) with Nvidia driver (361.42). I have a firefox browser open and when browsing, it will just suspend randomly. I am typing or mous-ing and it suspends. I do have the UI set to suspend when idle for 15 minutes but this is not on that schedule. Suspend and resume works correctly. It does not suspend on the 15 minute schedule. It just suspends at random. I did not use Ubuntu Gnome 15.10 on my computers here because I saw the same behavior and 15.04 worked just fine and did not exhibit this behavior. Now that 16.04 is out and it is LTS, I want to use it and it is time to report a bug. I don't think I can post any relevant log as dmesg shows nothing strange. It just looks like a suspend event.

Description: Ubuntu 16.04 LTS
Release: 16.04

[KeithG (grider-4)]

I do not know why this is associated with nvidia-graphis-drivers-304 as I am running 361.42

[KeithG (grider-4)]

I installed 16.04 on 3 machines. One gigabyte AMD/nvidia 361.42, One Dell Core 2 Duo/Nvidia 304.131 and one Dell Inspiron Laptop i915 with default video driver. All 3 do this randomly. I am working along typing, mousing, reading, etc and the computer suspends. It always resumes correctly. I need help finding a solution to this which has been the reason I could not use 15.10 or now, 16.04.

[KeithG (grider-4)]

May be due to edit of /etc/systemd/login.conf edited to suspend computer if login screen is up. uncommented:

#IdleAction=suspend
#IdleActionSec=15min

and saw the behavior.

re-commented and have not seen the behavior. This edit has worked to suspend the gdm login screen since 12.04 to 15.04. It does not work for 15.10 or 16.04

~$ cat /etc/systemd/logind.conf
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See logind.conf(5) for details.

[Login]
#NAutoVTs=6
#ReserveVT=6
#KillUserProcesses=no
#KillOnlyUsers=
#KillExcludeUsers=root
#InhibitDelayMaxSec=5
#HandlePowerKey=poweroff
#HandleSuspendKey=suspend
#HandleHibernateKey=hibernate
#HandleLidSwitch=suspend
#HandleLidSwitchDocked=ignore
#PowerKeyIgnoreInhibited=no
#SuspendKeyIgnoreInhibited=no
#HibernateKeyIgnoreInhibited=no
#LidSwitchIgnoreInhibited=yes
#HoldoffTimeoutSec=30s
#IdleAction=suspend
#IdleActionSec=15min
#RuntimeDirectorySize=10%
#RemoveIPC=yes
#UserTasksMax=12288