[ALUG] Ubuntu 17.04 sleeping?

steve-ALUG at hst.me.uk steve-ALUG at hst.me.uk
Thu Oct 12 15:50:58 BST 2017

On 12/10/17 15:31, steve-ALUG at hst.me.uk wrote:
> On 12/10/17 10:28, Clark, Adrian F wrote:
>> Hello everyone,
>> I have a machine running Ubuntu 17.04 (desktop version) on a Dell 
>> Optiplex 5050 which needs to run a long shell script (doing some 
>> machine learning runs) overnight.  I've turned off suspend via 
>> Unity's "power management" control panel but it looks as though the 
>> machine still goes to sleep after being left alone for an hour.  I 
>> wonder if anyone has any suggestions as to what's going on?
> Sometimes there are different programs that can trigger sleep or 
> shutdown.  Have a look at any power programs and any screensavers - 
> sometimes screensaver can trigger a shutdown or sleep.  It might be 
> worth looking at any tasks that are running and look for any power 
> managers or screensavers.
> If you can't find anything else to tweak/turn off, there is a program 
> I think called Caffeine which is designed to disable a 
> screensaver/sleep for a while.  There may be other similar programs 
> that do the same job.
> I would say, are you sure it's going to sleep?  Sometimes screensavers 
> turn off the screen hardware but the processor remains running.  Could 
> that be what's happening?  If that is happening, moving the mouse 
> should make it wake up, whereas waking from sleep would usually 
> require pressing the power button to wake-up.

Follow up.

I don't have Unity on my version of *buntu, but from what I recall this 
looks like how to access the power settings. 

I think the default screensaver is called Light-locker and that it can 
trigger shutdown and/or sleep too.
An alternative screensaver is XScreensaver.  Have  a look if either of 
these is installed and then hunt for their settings.  If you have 
xscreensaver installed, you can get to the settings via

xscreensaver-command -prefs

I believe you can get to light-locker's settings via command


Good luck


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